What is a grinding pump?

Patent application number: CN94192707.5 Date of patent application: 1994.05.09 Name: Rapid-installation universal sewage grinding pump Publication (announcement) number: CN1126957 Date of publication (announcement): 1996.07.17 Category: Machinery； Transportation; Date of grant: Priority date – 1993.5.11; US application number: 08/060,430. Applicant (patent holder): Environment First Company. Address: New York State, USA. Inventor: G.A. Ruggicks. International application number: PCT/US94/05119; Date of international publication: 94.5.9; Publication number: WO94/26416 (in English); Date of entry into force: 94.11.24. Date of patent grant: 1996.01.08. Patent agency: China Patent Agency (**) Co., Ltd. Agent: Huang Lixing. Abstract: An integrated, quickly installable, universal pump assembly (18), featuring an integral fluid-tight housing (19) that serves to house a motor-driven pump (21) within a single fluid-tight container, and enables the discharge of liquid from an outlet port (24) of the pump (21). The assembly (18) includes at least one electrical switch (32) for normal high and low liquid level detection and control, operated by pneumatic pressure and housed within the enclosure (19); this switch is used to generate on-off control signals in order to control the normal on-off operation of the pump (21). At least one liquid level detection submersible bell (30) is supported on the housing (19) and has at least one lower open end exposed to the liquid in the collection tank (11), in order to generate a variable-pressure pneumatic liquid level indication signal for use with a pressure-operated switch (32) to produce on-off operation signals. 　 Main entry: An integrated, quickly installable, universal sewage grinding pump assembly, which includes: – an integrated, liquid-tight housing for supporting the motor-driven grinding pump within a single, liquid-tight container ； – Normal high and low liquid level detection and control settings, which are housed within the said integrated watertight enclosure, are used to generate on-off switching electrical control signals in order to control the normal start-stop operation of the motor-driven pump ； – A liquid level detection submersible bell device, supported on said integral housing and having at least one lower open end that is exposed to the liquid in the collection tank, in order to generate a liquid level indication signal for the normal high and low liquid level detection and control devices ； And a power-operated liquid level safety shut-off valve device, which is installed within the said detection submersible bell device, and is used to cut off the flow of liquid to the normal high and low liquid level detection and control devices when the liquid level inside the detection submersible bell exceeds a predetermined height. 　

Are there any pictures I can take a look at? Thanks for the old man’s help! !