A reciprocating polishing machine

Abstract

This invention provides a reciprocating grinding machine tool, comprising the following structure: a housing, with crankshafts movably connected to the inner sides of both the front and rear ends of the housing; two first push plates movably connected to the inner side of the housing near the center; and second push plates movably connected to the inner sides of both the front and rear ends of the housing. During the reciprocating movement of the housing by the linear slide, liquid in the water storage area impacts the first and second push plates as the housing reciprocates. As the first push plates are impacted by the liquid's inertia and move towards the center of the housing, a first push rod drives a first pressure plate to move towards the center of the housing. The design of the first air chamber allows a piston that cooperates with the first pressure plate to move towards the center of the housing. The piston, in conjunction with the connecting rod, drives the crankshaft to rotate, completing the crankshaft's drive of the micro generator. The electrical energy generated by the micro generator can be used to directly connect to lighting fixtures for workshop supplemental lighting or connected to energy storage devices within the factory area, depending on the user's needs.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment, specifically to a reciprocating grinding machine tool. Background Technology

[0002] After the aluminum alloy die casting is demolded, the appearance of the aluminum alloy die casting needs to be polished. In general production process, the aluminum alloy die casting needs to be transported from the die casting production line to the polishing station to polish the surface of the aluminum alloy die casting using a grinding machine.

[0003] In current surface grinding equipment operations, water or grinding fluid needs to be sprayed onto the grinding disc. Therefore, a box needs to be installed outside the worktable of the grinding equipment to store water or coolant, so as to facilitate the recycling and treatment of metal shavings, wastewater and waste grinding fluid generated during grinding.

[0004] During the use of the equipment, the inventor discovered that the reciprocating movement of the worktable under the grinding disc caused the liquid inside the chamber to splash outside the equipment due to inertial impact. Therefore, a reciprocating grinding machine tool was proposed. Through the optimized design of the chamber structure and the design of the corresponding related structures, the splashing phenomenon caused by the inertial impact of the liquid was suppressed and utilized. Summary of the Invention

[0005] 1. The problem the invention aims to solve:

[0006] The present invention provides a reciprocating grinding machine tool to solve the technical problems existing in the prior art reciprocating grinding equipment mentioned above.

[0007] 2. Technical Solution:

[0008] To achieve the above objectives, the technical solution provided by the present invention is: a reciprocating grinding machine tool, comprising the following structure:

[0009] The housing has crankshafts movably connected to the inner sides of both the front and rear ends. Two first push plates are movably connected to the inner side of the housing near the middle, and second push plates are movably connected to the inner sides of both the front and rear ends.

[0010] The frame has a lifting seat slidably connected to its middle section. Adjustable electric actuators are fixedly installed on the front and rear sides of the bottom of the lifting seat. A protective shell is fixedly installed on the left output end of the adjustable electric actuator.

[0011] Furthermore, anti-surge plates are fixedly installed at the top of the front and rear ends of the housing, a workbench is fixedly installed in the middle of the housing, and a micro generator is fixedly installed on the right side of the front and rear ends of the housing. The shaft of the micro generator is fixedly connected to the right end of the crankshaft.

[0012] The left and right sides of the box near the middle are divided into water storage areas. The inner sides of the front and rear ends of the box are divided into drive chambers. The boundary between the drive chamber and the water storage area is separated by a second push plate. The front and rear ends of the water storage area extend to the bottom of the anti-wave plate and the bottom of the worktable, respectively.

[0013] Furthermore, a connecting rod is movably connected to the outer side of the crankshaft, and a piston is movably connected to the end of the connecting rod away from the crankshaft. A cylinder liner assembly is movably connected to the outer side of the piston.

[0014] The cylinder liner assemblies are arranged symmetrically about the middle of the housing, and the outer sides of the two cylinder liner assemblies are fixedly connected to the inner sides of the drive cavities at the front and rear ends of the housing, respectively.

[0015] Furthermore, the first push plate is fixedly provided with first push rods at both ends on the side away from the middle of the box. The outer side of the first push rod is slidably connected to the left and right ends of the second push plate, and a first pressure plate is fixedly provided at one end of the first push rod.

[0016] The outer side of the first pressure plate is movably connected to the inner side of the cylinder liner assembly, and the first pressure plate and the piston are divided into a first air chamber within the cylinder liner assembly.

[0017] Furthermore, the second push plate is fixed with a second push rod at both ends on the side away from the middle of the box, and a second pressure plate is fixed at both ends of the second push rod.

[0018] The outer side of the second pressure plate is movably connected to the inner side of the cylinder liner assembly, and the second pressure plate and the piston are divided into a second air chamber within the cylinder liner assembly.

[0019] Furthermore, the bottom of the box body is fixedly connected to the moving end of the linear slide table, the bottom of the linear slide table is fixedly provided with a platform, the top of the platform is fixedly provided with a slide rail, the outer side of the slide rail is slidably connected with a slide block, and the top of the slide block is fixedly connected to the bottom of the box body.

[0020] Furthermore, the front and rear ends of the frame are respectively movably connected to a lead screw and a guide rod. The outer side of the guide rod is slidably connected to the rear end of the lifting seat, the outer side of the lead screw is threadedly connected to the front end of the lifting seat, the bottom of the lead screw is fixedly connected to the output end of the reducer, the outer side of the reducer is fixedly connected to the bottom of the frame, and a lifting motor is fixedly installed at the input end of the reducer.

[0021] Furthermore, a grinding motor is fixedly installed in the middle of the bottom surface of the lifting seat, and a telescopic coupling is fixedly installed at the output end of the grinding motor.

[0022] Furthermore, the right end of the protective shell is slidably connected to the left end of the lifting seat, an auxiliary shaft is movably connected to the middle of the bottom end of the protective shell, a grinding disc is fixedly installed in the middle of the auxiliary shaft, and the right end of the auxiliary shaft is fixedly connected to the left end of the telescopic coupling.

[0023] The protective shell is fixed with auxiliary frames at both the front and rear ends. A water spray pipe is snapped onto the outside of the auxiliary frame, and the nozzle of the water spray pipe faces the bottom outside of the grinding disc.

[0024] 3. Beneficial effects:

[0025] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0026] This invention provides a reciprocating grinding machine. During the reciprocating movement of the linear slide and the housing, the liquid in the water storage area impacts the first and second push plates as the housing moves. As the first push plate is impacted by the liquid's inertia and moves towards the center of the housing, the first push rod drives the first pressure plate to move towards the center of the housing. The design of the first air chamber allows the piston, which cooperates with the first pressure plate, to move towards the center of the housing. The piston, in conjunction with the connecting rod, drives the crankshaft to rotate, thus completing the crankshaft's drive of the micro generator. The electrical energy generated by the micro generator can be used to directly connect to lighting fixtures for workshop supplemental lighting or to connect to energy storage devices within the factory area, depending on the user's needs.

[0027] This invention provides a reciprocating grinding machine tool. A linear slide and a base work together to complete the reciprocating movement of the housing. A lifting motor and a reducer work together to drive a lead screw. The lead screw and a guide rod work together to change the working position of the lifting seat on the frame, thereby adjusting the working height of the grinding disc on the worktable. An adjustable electric actuator changes the working position of the protective shell outside the lifting seat, thereby changing the left-right working position of the grinding disc on the worktable. The grinding motor drives the grinding disc through a telescopic coupling and an auxiliary shaft, completing the grinding process of the grinding disc on the aluminum alloy die-casting parts on the worktable.

[0028] The present invention provides a reciprocating grinding machine tool, wherein the front and rear ends of the water storage area extend to the bottom of the anti-surge plate and the bottom of the worktable, respectively, to prevent liquid from splashing to the outside of the box due to inertial impact of the liquid on the first push plate or the second push plate.

[0029] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0030] Figure 1 This is a perspective view of the novel structure of the present invention;

[0031] Figure 2 This is a half-sectional perspective view of the novel frame structure of the present invention;

[0032] Figure 3 This is a perspective view of the novel box structure of the present invention;

[0033] Figure 4 This is a half-sectional perspective view of the novel box structure of the present invention;

[0034] Figure 5 This is a half-sectional perspective view of the novel cylinder liner assembly structure of the present invention;

[0035] Figure 6 The novel invention Figure 5 Enlarged view of the structure at point A in the middle.

[0036] Figure label:

[0037] Box body-1; baffle plate-11; workbench-12; micro generator-13;

[0038] Crankshaft-2; Connecting rod-21; Piston-22; Cylinder liner assembly-23;

[0039] First push plate-3; First push rod-31; First pressure plate-32; First air chamber-33;

[0040] Second push plate-4; Second push rod-41; Second pressure plate-42; Second air chamber-43;

[0041] Linear slide table-5; base-51; slide rail-52; slide block-53;

[0042] Frame-6; Lead screw-61; Guide rod-62; Reducer-63; Lifting motor-64;

[0043] Lifting seat-7; Grinding motor-71; Telescopic coupling-72;

[0044] Adjustable pitch electric actuator -8;

[0045] Protective shell-9; auxiliary shaft-91; grinding disc-92; auxiliary frame-93; water spray pipe-94. Detailed Implementation

[0046] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0047] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element; the terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example

[0049] Reference Figures 1-6 A reciprocating grinding machine tool, comprising the following structure:

[0050] The housing 1 has crankshafts 2 movably connected to the inner sides of both the front and rear ends. Two first push plates 3 are movably connected to the inner side of the housing 1 near the middle. Two second push plates 4 are movably connected to the inner sides of both the front and rear ends of the housing 1.

[0051] The frame 6 has a lifting seat 7 slidably connected to the middle of it. Adjustable electric actuators 8 are fixedly installed on the front and rear sides of the bottom of the lifting seat 7. A protective shell 9 is fixedly installed on the left output end of the adjustable electric actuator 8.

[0052] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, baffles 11 are fixedly installed at the top of the front and rear ends of the housing 1, a workbench 12 is fixedly installed in the middle of the housing 1, and micro generators 13 are fixedly installed on the right side of the front and rear ends of the housing 1. The shaft of the micro generator 13 is fixedly connected to the right end of the crankshaft 2.

[0053] The left and right sides of the box 1 near the middle are divided into water storage areas. The front and rear inner sides of the box 1 are divided into drive chambers. The boundary between the drive chamber and the water storage area is separated by the second push plate 4. The front and rear ends of the water storage area extend to the bottom of the anti-wave plate 11 and the bottom of the worktable 12, respectively.

[0054] Water or coolant sprayed from the water spray pipe 94 onto the grinding disc 92 and the workpiece on the worktable 12 flows into the water storage area of ​​the housing 1. As the linear slide 5 moves back and forth with the housing 1, the liquid in the water storage area will impact the first push plate 3 and the second push plate 4 along with the reciprocating movement of the housing 1.

[0055] The design of the second push plate 4 prevents liquid in the water storage area from seeping into the drive cavity. According to the design requirements, necessary sealing rings and other components are set at the contact position between the second push plate 4 and the housing 1.

[0056] The front and rear ends of the water storage area extend to the bottom of the baffle plate 11 and the bottom of the workbench 12, respectively, to prevent liquid from splashing to the outside of the tank 1 due to inertial impact on the first push plate 3 or the second push plate 4.

[0057] In this embodiment, as Figure 4 ,Figure 5 and Figure 6 As shown, a connecting rod 21 is movably connected to the outer side of the crankshaft 2, and a piston 22 is movably connected to the end of the connecting rod 21 away from the crankshaft 2. A cylinder liner assembly 23 is movably connected to the outer side of the piston 22.

[0058] The cylinder liner assemblies 23 are symmetrically arranged about the middle of the housing 1, and the outer sides of the two cylinder liner assemblies 23 are fixedly connected to the inner sides of the drive chambers at the front and rear ends of the housing 1, respectively.

[0059] The connecting rod 21 and piston 22 on the crankshaft 2 move within the cylinder liner assembly 23. The crankshaft 2 is assembled with the shaft of the micro generator 13. The power source of this device comes from the linear slide 5 driving the housing 1 to move back and forth, thereby affecting the water in the water storage area to impact the first push plate 3 and the second push plate 4 due to inertia.

[0060] In this embodiment, as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the first push plate 3 is fixedly provided with first push rods 31 on both the left and right ends of the side away from the middle of the box body 1. The outer side of the first push rod 31 is slidably connected to the left and right ends of the second push plate 4. A first pressure plate 32 is fixedly provided at one end of the first push rod 31.

[0061] The outer side of the first pressure plate 32 is movably connected to the inner side of the cylinder liner assembly 23, and the first pressure plate 32 and the piston 22 divide the first air chamber 33 within the cylinder liner assembly 23.

[0062] As the first push plate 3 moves toward the center of the housing 1 due to the inertial impact of the liquid, the first push rod 31 drives the first pressure plate 32 to move toward the center of the housing 1. The design of the first air chamber 33, the piston 22 cooperating with the first pressure plate 32, moves toward the center of the housing 1. The piston 22, in conjunction with the connecting rod 21, drives the crankshaft 2 to rotate, completing the drive of the crankshaft 2 to the micro generator 13. The electrical energy generated by the micro generator 13 can be used to directly connect to lighting fixtures for workshop supplementary lighting or to connect to energy storage devices in the factory area, depending on the user's needs.

[0063] During the rotation of the crankshaft 2, the piston 22 and connecting rod 21 that cooperate with the second push plate 4 are moved. At this time, the second push plate 4 is driven to move towards the cylinder liner group 23 through the second push rod 41.

[0064] In this embodiment, as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the second push plate 4 is fixed with a second push rod 41 on both the left and right ends on the side away from the middle of the box 1, and a second pressure plate 42 is fixed at both ends of the second push rod 41.

[0065] The outer side of the second pressure plate 42 is movably connected to the inner side of the cylinder liner assembly 23, and the second pressure plate 42 and the piston 22 are divided into a second air chamber 43 within the cylinder liner assembly 23.

[0066] The inertial impact of the liquid on the second push plate 4 and the first push plate 3 is carried out alternately, which is achieved by the linear slide 5 driving the housing 1. The second push plate 4 is moved towards the cylinder liner group 23 by the inertial impact of the liquid. The second pressure plate 42, the second air chamber 43 and the matching piston 22 cooperate to complete the driving process of the crankshaft 2 on the micro generator 13 and change the working position of the first push plate 3 in the housing 1.

[0067] In this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, the bottom of the housing 1 is fixedly connected to the moving end of the linear slide table 5. The bottom of the linear slide table 5 is fixedly provided with a platform 51, and the top of the platform 51 is fixedly provided with a slide rail 52. The outer side of the slide rail 52 is slidably connected with a slide seat 53, and the top of the slide seat 53 is fixedly connected to the bottom of the housing 1.

[0068] The linear slide 5 and the base 51 work together to complete the reciprocating movement of the housing 1, enabling the worktable 12 to move to the working position below the grinding disc 92.

[0069] The structural design of the slide rail 52 and slide block 53 improves the stability of the reciprocating movement of the box 1 on the platform 51 and reduces the impact of inertial impact of liquid in the box 1 on the working stability of the worktable 12.

[0070] In this embodiment, as Figure 1 and Figure 2 As shown, the front and rear ends of the frame 6 are movably connected to a lead screw 61 and a guide rod 62, respectively. The outer side of the guide rod 62 is slidably connected to the rear end of the lifting seat 7, the outer side of the lead screw 61 is threadedly connected to the front end of the lifting seat 7, the bottom of the lead screw 61 is fixedly connected to the output end of the reducer 63, the outer side of the reducer 63 is fixedly connected to the bottom of the frame 6, and the input end of the reducer 63 is fixedly equipped with a lifting motor 64.

[0071] The lifting motor 64 and the reducer 63 work together to drive the lead screw 61. The lead screw 61 and the guide rod 62 work together to change the working position of the lifting seat 7 on the frame 6, thereby adjusting the working height of the grinding disc 92 on the worktable 12.

[0072] In this embodiment, as Figure 1 and Figure 2 As shown, a grinding motor 71 is fixedly installed in the middle of the bottom surface of the lifting seat 7, and a telescopic coupling 72 is fixedly installed at the output end of the grinding motor 71.

[0073] The grinding motor 71 drives the grinding disc 92 through the telescopic coupling 72 and the auxiliary shaft 91, thus completing the grinding process of the grinding disc 92 on the aluminum alloy die-cast parts on the worktable 12.

[0074] In this embodiment, as Figure 1 and Figure 2 As shown, the right end of the protective shell 9 is slidably connected to the left end of the lifting seat 7, and an auxiliary shaft 91 is movably connected to the middle of the bottom end of the protective shell 9. A grinding disc 92 is fixedly installed in the middle of the auxiliary shaft 91, and the right end of the auxiliary shaft 91 is fixedly connected to the left end of the telescopic coupling 72.

[0075] The front and rear ends of the protective shell 9 are both fixed with auxiliary frames 93. A water spray pipe 94 is snapped onto the outside of the auxiliary frame 93, and the nozzle of the water spray pipe 94 faces the bottom outside of the grinding disc 92.

[0076] The protective shell 9 is designed to prevent grinding debris from splashing directly and causing injury to personnel. The adjustable electric actuator 8 changes the working position of the protective shell 9 outside the lifting seat 7 and changes the working position of the grinding disc 92 in the left and right directions on the worktable 12, making it convenient for users to carry out grinding operations.

[0077] The auxiliary frame 93 and the water spray pipe 94 are used together, wherein the water spray pipe 94 is connected to the water supply network in the factory area or uses pump equipment to supply grinding fluid and other liquids.

[0078] In this embodiment:

[0079] The linear slide 5 and the base 51 work together to complete the reciprocating movement of the housing 1. The lifting motor 64 and the reducer 63 work together to drive the lead screw 61. The lead screw 61 and the guide rod 62 work together to change the working position of the lifting seat 7 on the frame 6, thereby adjusting the working height of the grinding disc 92 on the worktable 12. The adjustable electric push rod 8 changes the working position of the protective shell 9 outside the lifting seat 7, thereby changing the working position of the grinding disc 92 in the left and right directions on the worktable 12. The grinding motor 71 drives the grinding disc 92 through the telescopic coupling 72 and the auxiliary shaft 91, thus completing the grinding process of the grinding disc 92 on the aluminum alloy die-cast parts on the worktable 12.

[0080] As the linear slide 5 moves back and forth with the housing 1, the liquid in the water storage area impacts the first push plate 3 and the second push plate 4 as the housing 1 moves back and forth. As the first push plate 3 is impacted by the liquid's inertia and moves toward the center of the housing 1, the first push rod 31 drives the first pressure plate 32 to move toward the center of the housing 1. The design of the first air chamber 33, along with the piston 22 that cooperates with the first pressure plate 32, moves toward the center of the housing 1. The piston 22, in conjunction with the connecting rod 21, drives the crankshaft 2 to rotate, thus completing the crankshaft 2's drive of the micro generator 13. The electrical energy generated by the micro generator 13 can be used to directly connect to lighting fixtures for workshop supplemental lighting or to connect to energy storage devices within the factory area, depending on the user's needs.

[0081] The above-described embodiments are merely illustrative of certain implementations of the present invention, and are described in a relatively specific and detailed manner. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A reciprocating grinding machine tool, characterized in that: Includes the following structure: The housing (1) has crankshafts (2) movably connected to the inner sides of both the front and rear ends of the housing (1). Two first push plates (3) are movably connected to the inner side of the housing (1) near the middle. Two second push plates (4) are movably connected to the inner sides of both the front and rear ends of the housing (1). A frame (6) is slidably connected to a lifting seat (7) in the middle. Adjustable electric push rods (8) are fixedly provided on the front and rear sides of the bottom of the lifting seat (7). A protective shell (9) is fixedly provided on the left output end of the adjustable electric push rod (8). The top of the front and rear ends of the box (1) are fixedly provided with anti-surge plates (11), the middle of the box (1) is fixedly provided with a workbench (12), and the right side of the front and rear ends of the box (1) is fixedly provided with a micro generator (13). The shaft of the micro generator (13) is fixedly connected to the right end of the crankshaft (2). The left and right sides of the box (1) near the middle are divided into water storage areas. The front and rear ends of the box (1) are divided into drive chambers. The boundary between the drive chamber and the water storage area is separated by the second push plate (4). The front and rear ends of the water storage area extend to the bottom of the anti-wave plate (11) and the bottom of the worktable (12), respectively. A connecting rod (21) is movably connected to the outer side of the crankshaft (2), and a piston (22) is movably connected to the end of the connecting rod (21) away from the crankshaft (2). A cylinder liner assembly (23) is movably connected to the outer side of the piston (22). The cylinder liner group (23) is symmetrically arranged about the middle of the housing (1), and the outer sides of the two cylinder liner groups (23) are fixedly connected to the inner sides of the drive chambers at the front and rear ends of the housing (1). The first push plate (3) is fixed with a first push rod (31) on both the left and right ends on the side away from the middle of the box (1). The outer side of the first push rod (31) is slidably connected to the left and right ends of the second push plate (4). A first pressure plate (32) is fixed at one end of the first push rod (31). The outer side of the first pressure plate (32) is movably connected to the inner side of the cylinder liner assembly (23), and the first pressure plate (32) and the piston (22) are divided into a first air chamber (33) in the cylinder liner assembly (23). The second push plate (4) is fixed with a second push rod (41) on both the left and right ends on the side away from the middle of the box (1), and a second pressure plate (42) is fixed at both ends of the second push rod (41). The outer side of the second pressure plate (42) is movably connected to the inner side of the cylinder liner assembly (23), and the second pressure plate (42) and the piston (22) are divided into a second air chamber (43) in the cylinder liner assembly (23).

2. The reciprocating grinding machine tool according to claim 1, characterized in that: The bottom of the box (1) is fixedly connected to the moving end of the linear slide (5). The bottom of the linear slide (5) is fixedly provided with a platform (51), and the top of the platform (51) is fixedly provided with a slide rail (52). The outer side of the slide rail (52) is slidably connected with a slide seat (53), and the top of the slide seat (53) is fixedly connected to the bottom of the box (1).

3. The reciprocating grinding machine tool according to claim 1, characterized in that: The front and rear ends of the frame (6) are movably connected to a lead screw (61) and a guide rod (62), respectively. The outer side of the guide rod (62) is slidably connected to the rear end of the lifting seat (7), the outer side of the lead screw (61) is threadedly connected to the front end of the lifting seat (7), the bottom of the lead screw (61) is fixedly connected to the output end of the reducer (63), the outer side of the reducer (63) is fixedly connected to the bottom of the frame (6), and a lifting motor (64) is fixedly installed at the input end of the reducer (63).

4. The reciprocating grinding machine tool according to claim 1, characterized in that: A grinding motor (71) is fixedly installed in the middle of the bottom surface of the lifting seat (7), and a telescopic coupling (72) is fixedly installed at the output end of the grinding motor (71).

5. A reciprocating grinding machine tool according to claim 1, characterized in that: The right end of the protective shell (9) is slidably connected to the left end of the lifting seat (7). An auxiliary shaft (91) is movably connected to the middle of the bottom end of the protective shell (9). A grinding disc (92) is fixedly provided in the middle of the auxiliary shaft (91). The right end of the auxiliary shaft (91) is fixedly connected to the left end of the telescopic coupling (72). The protective shell (9) is fixed with auxiliary frames (93) at both the front and rear ends. A water spray pipe (94) is attached to the outside of the auxiliary frame (93), and the nozzle of the water spray pipe (94) faces the bottom outside of the grinding disc (92).

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