A lower plate transmission assembly of a grinder or polisher

Abstract

The application discloses a lower disc transmission assembly of a grinder or polisher and belongs to the technical field of grinder or polisher equipment, which comprises a rack, an upper mounting frame, a main tray, a lower disc driving assembly, a plurality of tray mechanisms and power fine adjustment units which are independently arranged. The upper mounting frame is fixed above the rack, the middle part of the upper end surface of the upper mounting frame is provided with a mounting recess, the main tray is rotatably mounted in the mounting recess, a plurality of tray mechanisms are uniformly arranged on the circumference of the main tray, and a plurality of auxiliary trays for positioning ultra-thin materials are arranged on each tray mechanism. The lower part of each tray mechanism in the upper mounting frame is provided with a power fine adjustment unit. The application can realize independent work adjustment power for each tray mechanism, so that the ultra-thin materials on the grinding disc can reach the best grinding and polishing effect in different stages of processing.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding or polishing equipment, specifically a lower platen transmission component for a grinding or polishing machine. Background Technology

[0002] Currently, single-sided polishing machines are widely used in the processing of thin, precision parts made of ultra-thin, hard, and brittle materials. The lower plate drive mechanism employs multiple grinding discs that rotate and revolve. This processing method can effectively control the roughness and smoothness of multiple workpiece surfaces and has high processing efficiency. However, in traditional lower plate drive mechanisms, the rotation speed of each grinding disc often cannot be controlled independently. For example, in the invention patent with application number CN201810317189.5, although the main tray can be precisely positioned when stopped, it cannot adjust the polishing effect by independently adjusting the working speed and pushing pressure of each grinding disc for workpieces with different precision on the grinding discs, resulting in differences in the surface roughness of the processed workpieces.

[0003] Therefore, it is necessary to provide a lower drive assembly for a grinding or polishing machine to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lower platen transmission assembly for a grinding or polishing machine, comprising a frame, an upper mounting frame, a main tray, a lower platen drive assembly, several platen carrier mechanisms, and independently arranged power fine-tuning units; wherein, the upper mounting frame is fixed above the frame, and a mounting recess is provided in the middle of the upper end face of the upper mounting frame, the main tray is rotatably mounted in the mounting recess, and several platen carrier mechanisms are evenly arranged around the circumference of the main tray, each platen carrier mechanism having several auxiliary trays for positioning ultra-thin materials; a power fine-tuning unit is provided below each platen carrier mechanism within the upper mounting frame, the power fine-tuning unit being used to provide independent working adjustment power to each platen carrier mechanism, so that the platen carrier mechanisms rotate uniformly or with different intensities at different stages of ultra-thin material grinding and polishing, so that each ultra-thin material achieves the best grinding and polishing effect;

[0005] A polishing section is provided above the frame;

[0006] The lower drive assembly provides rated driving force in the first stage of ultra-thin material grinding and polishing, during which all power fine-tuning units are in a stopped state. A vision scanning module is provided outside the frame, which uses a high-definition camera to perform detailed scanning of the ultra-thin material after the first stage of grinding and polishing, thereby acquiring feature images of the polished surfaces of each ultra-thin material. A control module is provided on the frame, which uses an image processing unit to preprocess the feature images of the polished surfaces, thereby identifying feature defect data of the polished surfaces. An evaluation and analysis module is provided outside the control module, which uses a preset model to compare the identified feature defect data of the polished surfaces with the database, and scores and classifies the feature defect data into the corresponding quality level, thereby outputting the defect quality level corresponding to each polished surface of the ultra-thin material.

[0007] In the second stage, ultra-thin materials with the same defect quality level are sorted onto the same pallet mechanism. The control module indexes and retrieves the corresponding grinding and polishing reference data based on the defect quality level, the surface characteristics of the polished part, and the characteristics of the ultra-thin material. The power fine-tuning unit provides the best working adjustment power to each pallet mechanism based on the grinding and polishing reference data.

[0008] Furthermore, as a preferred embodiment, a motor is fixed on the upper mounting frame, and the output end of the motor is connected to the main tray for transmission through gear meshing.

[0009] Furthermore, as a preferred embodiment, the lower drive assembly includes a bearing housing, the bearing housing being centrally located within the frame, a main shaft being rotatably connected within the bearing housing, the upper end of the main shaft passing through and rotatably connected to the main tray, a reduction gearbox being installed within the frame, the reduction gearbox being connected to the main shaft via a transmission chain, and a main gear being fitted onto the main shaft;

[0010] The carrier plate mechanism is fitted with transmission teeth, and the main teeth mesh with each of the transmission teeth.

[0011] Furthermore, as a preferred embodiment, the tray mechanism includes a coupling shaft vertically rotatably connected to the main tray, an inner unit tray rotatably connected to the upper mounting bracket, and a main shaft rotatably connected to the inner unit tray via bearings; multiple mounting rods are fixed circumferentially on the inner unit tray, the upper ends of the mounting rods are fixed to the main tray, and the coupling shaft is rotatably connected to the inner unit tray via bearings; a central tooth is sleeved on the upper end of the coupling shaft, an inner toothed ring is fixed on the main tray, and several sun teeth are distributed between the central tooth and the inner toothed ring, with a secondary tray coaxially fixed on the sun teeth.

[0012] Furthermore, as a preferred embodiment, the power fine-tuning unit includes a rotating sleeve, which is coaxially sleeved outside the connecting shaft. The connecting shaft is composed of an inner shaft and an outer sleeve. The rotating sleeve is sleeved with the inner shaft. A drive disk seat is fixed inside the inner machine disk below the transmission teeth. The center of the rotating sleeve is rotatably connected to the drive disk seat. The rotating sleeve is slidably sleeved on the inner shaft. A control motor is provided inside the drive disk seat. The output end of the control motor is connected to the rotating sleeve for transmission through gear meshing.

[0013] A propulsion mechanism is provided inside the internal unit panel below the drive panel base.

[0014] Furthermore, as a preferred embodiment, a ratchet ring is fitted on the inner shaft, and top teeth are distributed around the inner circumference of the outer shaft sleeve, with the top teeth contacting the ratchet ring via a spring;

[0015] The rotation direction of the inner shaft driven by the control motor is opposite to the rotation direction of the outer bushing.

[0016] Furthermore, as a preferred embodiment, the propulsion mechanism includes a fixed base, which is fixed to the inner unit panel. A fixed plate is slidably connected to the fixed base via a support rod. A guide sleeve is fixed on the fixed plate. A ring seat is coaxially arranged on the guide sleeve. A connecting sleeve is fixed above the ring seat. The connecting sleeve is rotatably connected to the inner shaft of the connecting shaft.

[0017] A propulsion cylinder is vertically mounted on the fixed base, and the telescopic end of the propulsion cylinder is connected to the fixed plate.

[0018] Furthermore, as a preferred embodiment, the guide sleeve is slidably connected to the ring seat, a frame rod is slidably connected inside the guide sleeve, a connecting sleeve is rotatably connected inside the guide sleeve, the connecting sleeve is rotatably sleeved on the outside of the frame rod, a pin is fixed to the side wall of the frame rod, a guide groove is provided on the side wall of the connecting sleeve, and one end of the pin is slidably connected in the guide groove.

[0019] Furthermore, as a preferred embodiment, a forward and reverse motor is installed on the guide sleeve, the output end of the forward and reverse motor is fixed to the connecting sleeve, and the connecting sleeve drives the frame rod to slide up and down.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The main lower plate drive assembly in this invention is used to provide rotational driving force to each plate mechanism. The power fine-tuning unit can independently adjust the working power of each plate mechanism so that each plate mechanism can maintain a relatively uniform or different rotation state during different processing stages, so that the ultra-thin material on the grinding plate can achieve the best grinding and polishing effect. This provides suitable processing actions for ultra-thin materials with different roughness, and has high flexibility and control precision. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a schematic diagram of the lower drive assembly in this invention;

[0025] Figure 4 This is a schematic diagram of the carrier disk mechanism in this invention;

[0026] Figure 5 This is a schematic diagram of the power fine-tuning unit in this invention;

[0027] Figure 6 This is a schematic cross-sectional view of the connecting shaft in this invention;

[0028] Figure 7 This is a schematic diagram of the propulsion mechanism in this invention;

[0029] In the diagram: 1. Frame; 2. Upper mounting frame; 21. Main tray; 22. Motor; 3. Lower tray drive assembly; 31. Bearing housing; 32. Main shaft; 33. Reduction gearbox; 34. Main gear; 35. Transmission gear; 4. Carrier mechanism; 41. Secondary tray; 42. Inner disc; 43. Mounting rod; 44. Internal gear ring; 45. Sun gear; 5. Power fine-tuning unit; 51. Drive disc base; 52. Rotating sleeve; 53. Control motor; 6. Coupling; 61. Inner shaft; 62. Outer shaft sleeve; 63. Ratchet ring; 7. Propulsion mechanism; 71. Fixing plate; 72. Guide sleeve; 73. Ring seat; 74. Connecting sleeve; 75. Propulsion cylinder; 76. Frame rod; 77. Coupling. Detailed Implementation

[0030] Please see Figures 1-7 In this embodiment of the invention, a lower platen transmission assembly for a grinding or polishing machine includes a frame 1, an upper mounting frame 2, a main tray 21, a lower platen drive assembly 3, several tray-carrying mechanisms 4, and independently arranged power fine-tuning units 5. The upper mounting frame 2 is fixed above the frame 1, and a mounting recess is provided in the center of its upper end face. The main tray 21 is rotatably mounted within the mounting recess. Multiple tray-carrying mechanisms 4 are evenly arranged around the circumference of the main tray 21, and each tray-carrying mechanism 4 has several auxiliary trays 41 for positioning ultra-thin materials. Power fine-tuning units 5 are arranged below each tray-carrying mechanism 4 within the upper mounting frame 2. These power fine-tuning units 5 provide independent working adjustment power to each tray-carrying mechanism 4, allowing the tray-carrying mechanisms 4 to rotate uniformly or at different intensities at different stages of ultra-thin material grinding and polishing, so that each ultra-thin material achieves the best grinding and polishing effect.

[0031] A polishing section (not shown in the figure) is provided above the frame 1;

[0032] The lower drive assembly 3 provides rated driving force in the first stage of ultra-thin material grinding and polishing. At this time, all the power fine-tuning units 5 are in a stopped state. A vision scanning module is provided outside the frame 1. The vision scanning module uses a high-definition camera to perform detailed scanning of the ultra-thin material after the first stage of grinding and polishing. It can capture extremely fine textures, defects (such as scratches, unevenness) and gloss changes on the surface of the ultra-thin material, thereby obtaining feature images of the polished surfaces of each ultra-thin material. A control module is provided on the frame 1. The control module performs image preprocessing on the feature images of the polished surfaces through an image processing unit, mainly removing noise, enhancing contrast, and correcting factors that affect image quality, such as uneven lighting. Common preprocessing techniques include grayscale conversion, histogram equalization, image filtering (such as Gaussian filtering), and edge detection. Meaningful features, such as surface texture, color distribution, and shape contours, are extracted from the processed image to identify polished surface defect data. An external evaluation and analysis module is provided for the control module. This module compares the identified polished surface defect data with a database using a preset model. Specifically, the evaluation and analysis module first compares the defect data provided by the image processing unit with standard samples in an internal database. This database contains various known defect types and their characteristic descriptions. The purpose of the comparison is to determine which known types the current defect is most similar to, and to score and classify the defect data into corresponding quality levels. Defects are scored according to predefined scoring rules, thereby outputting the defect quality level corresponding to each ultrathin material polished surface, in order to obtain the quality information of each ultrathin material.

[0033] In the second stage, ultra-thin materials with the same defect quality level are sorted onto the same carrier mechanism 4. The control module indexes and retrieves corresponding grinding and polishing reference data based on the defect quality level, the surface characteristics of the polished part, and the characteristics of the ultra-thin material. This data includes the grinding particle size, the composition and concentration of the polishing fluid, the processing sequence, and recommended parameters such as rotation speed, torque, and pressure for different workpiece materials, surface conditions, and defect levels. The power fine-tuning unit 5 provides optimal working adjustment power to each carrier mechanism 4 based on the grinding and polishing reference data, thereby adjusting the power output in real time according to the above feedback information to ensure the accuracy and adaptability of the processing.

[0034] In this embodiment, a motor 22 is fixed on the upper mounting frame 2. The output end of the motor 22 is connected to the main tray 21 through gear meshing, thereby controlling and adjusting the revolution speed of each tray mechanism.

[0035] In a preferred embodiment, the lower drive assembly 3 includes a bearing housing 31, which is centrally located within the frame 1. A main shaft 32 is rotatably connected within the bearing housing 31. The upper end of the main shaft 32 passes through and is rotatably connected to the main tray 21. A reduction gearbox 33 is installed within the frame 1. The reduction gearbox 33 is connected to the main shaft 32 via a transmission chain. A main gear 34 is sleeved on the main shaft 32.

[0036] The pallet mechanism 4 is fitted with transmission teeth 35, and the main teeth 34 mesh with each of the transmission teeth 35, that is, the reduction gearbox in the lower plate drive assembly can provide rotational power to each pallet mechanism through the main shaft.

[0037] In this embodiment, the tray mechanism 4 includes a connecting shaft 5, which is vertically rotatably connected to the main tray 21. The upper mounting frame 2 is rotatably connected to the inner tray 42. The main shaft 32 is rotatably connected to the inner tray 42 through a bearing. Multiple mounting rods 43 are fixed circumferentially on the inner tray 42. The upper ends of the mounting rods 43 are fixed to the main tray 21, so that the inner tray can rotate synchronously with the main tray. The connecting shaft 5 is rotatably connected to the inner tray 42 through a bearing. A central tooth is sleeved on the upper end of the connecting shaft 5. An internal toothed ring 44 is fixed on the main tray 21. Several sun teeth 45 are distributed between the central tooth and the internal toothed ring 44. Sub-trays 41 are coaxially fixed on the sun teeth 45, so that each sub-tray 41 is driven to rotate synchronously through a planetary gear structure.

[0038] In this embodiment, the power fine-tuning unit 5 includes a rotating sleeve 52, which is coaxially sleeved outside the connecting shaft 6. The connecting shaft 6 is composed of an inner shaft rod 61 and an outer shaft sleeve 62. The rotating sleeve 52 is sleeved with the inner shaft rod 61. A drive disk seat 51 is fixed inside the inner disk 42 below the transmission gear 35. The center of the rotating sleeve 52 is rotatably connected to the drive disk seat 51. The rotating sleeve 52 is slidably sleeved on the inner shaft rod 61. A control motor 53 is provided inside the drive disk seat 51. The output end of the control motor 53 is connected to the rotating sleeve 52 for transmission through gear meshing. It should be noted that the upper end of the inner shaft rod is fixed with the center gear, while the transmission gear is sleeved on the outer shaft sleeve.

[0039] A propulsion mechanism 7 is provided inside the internal unit panel 42, located below the drive panel base 51.

[0040] In this embodiment, a ratchet ring 63 is sleeved on the inner shaft 61, and top teeth are distributed on the inner circumference of the outer shaft sleeve 62. The top teeth are in contact with the ratchet ring 63 through a spring.

[0041] The rotation direction of the inner shaft rod 61 driven by said control motor 53 is opposite to the rotation direction of said outer shaft sleeve 62. That is, the reduction gear box provides a first rotational power for the outer shaft sleeve in each connecting shaft through the main shaft, at this time, the inner shaft rod can rotate with the outer shaft sleeve under the clamping connection of the ratchet ring and the ejector teeth, thereby realizing the synchronous rotation of all auxiliary pallets; wherein, a ratchet ring is also arranged between the rotating sleeve and the inner shaft rod, so the main shaft provides a first rotation speed v1 for the inner shaft rod through transmission teeth, the control motor provides a second rotation speed v2 for the inner shaft rod through the rotating sleeve, the rotation speed of the inner shaft rod is v1-v2 (v1>v2), when v1=v2, the inner shaft rod is relatively stationary (relative to the main pallet), and when v1<v2, the auxiliary pallets rotate reversely;

[0042] As a preferred embodiment, said pushing mechanism 7 comprises a fixed seat, said fixed seat is fixed with said inner machine disc 42, a fixed plate 71 is slidingly connected to said fixed seat via a support rod, a guide sleeve 72 is fixed on said fixed plate 71, a ring seat 73 is coaxially arranged on said guide sleeve 72, a connecting sleeve 74 is fixed above said ring seat 73, said connecting sleeve 74 is rotatably connected with the inner shaft rod 61 of said connecting shaft 6;

[0043] A pushing cylinder 75 is vertically arranged on said fixed seat, the telescopic end of said pushing cylinder 75 is connected with the fixed plate 71, so that pushing pressure can be provided to the auxiliary pallets through the pushing cylinder. It should be noted that when the inner shaft rod slides upward, the central gear, the inner gear ring and the sun gear all displace synchronously.

[0044] In this embodiment, said guide sleeve 72 is slidingly connected with said ring seat 73, a frame rod 76 is slidingly connected in said guide sleeve 72, a coupling sleeve 77 is rotatably connected in said guide sleeve 72, said coupling sleeve 77 is rotatably sleeved outside the frame rod 76, a shaft pin is fixed on the side wall of said frame rod 76, a guide groove is opened on the side wall of said coupling sleeve 77, and one end of said shaft pin is slidingly connected in the guide groove.

[0045] In this embodiment, a forward-reverse rotation motor is installed on said guide sleeve 72, the output end of said forward-reverse rotation motor is fixed with said coupling sleeve 77, and drives said frame rod 76 to slide up and down through the coupling sleeve 77. That is, the pushing mechanism can also provide instantaneous or short-term high-intensity upward pushing force during operation through the forward-reverse rotation motor, so as to flexibly adjust the direction and intensity of the thrust according to process requirements, and can adapt to the processing of ultra-thin materials with various different thicknesses and materials.

[0046] The above description is only the preferred specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Any person skilled in the art, within the technical scope disclosed by the present invention, shall cover any equivalent substitution or modification made according to the technical solution of the present invention and the inventive concept thereof within the protection scope of the present invention.

Claims

1. A lower drive assembly for a grinding or polishing machine, characterized in that: It includes a frame (1), an upper mounting frame (2), a main tray (21), a lower plate drive assembly (3), several tray mechanisms (4), and independently configured power fine-tuning units (5); wherein, the upper mounting frame (2) is fixed above the frame (1), and the upper end face of the upper mounting frame (2) is provided with a mounting recess in the middle, the main tray (21) is rotatably installed in the mounting recess, and several tray mechanisms (4) are evenly arranged around the circumference of the main tray (21), and several auxiliary trays (41) for positioning ultra-thin materials are provided on each tray mechanism (4); the upper mounting frame (2) is provided with power fine-tuning units (5) located below each tray mechanism (4), and the power fine-tuning units (5) are used to provide independent working adjustment power to each tray mechanism (4), so that the tray mechanism (4) can rotate uniformly or with different intensities at different stages of ultra-thin material grinding and polishing, so that each ultra-thin material can achieve the best grinding and polishing effect; A polishing section is provided above the frame (1); The lower drive assembly (3) includes a bearing housing (31), the bearing housing (31) is centrally located inside the frame (1), a main shaft (32) is rotatably connected inside the bearing housing (31), a main gear (34) is sleeved on the main shaft (32), and a transmission gear (35) is sleeved on the carrier mechanism (4), the main gear (34) meshes with each of the transmission gears (35); The tray mechanism (4) includes a connecting shaft (6), which is vertically rotatably connected to the main tray (21). The upper mounting bracket (2) is rotatably connected to the inner tray (42), and the main shaft (32) is rotatably connected to the inner tray (42) through a bearing. The power fine-tuning unit (5) includes a rotating sleeve (52), which is coaxially sleeved outside the connecting shaft (6). The connecting shaft (6) is composed of an inner shaft (61) and an outer shaft sleeve (62). The rotating sleeve (52) is sleeved with the inner shaft (61). A drive plate seat (51) is fixed inside the inner machine plate (42) below the transmission gear (35). The center of the rotating sleeve (52) is rotatably connected inside the drive plate seat (51). The rotating sleeve (52) is slidably sleeved on the inner shaft (61). A control motor (53) is provided inside the drive plate seat (51). The output end of the control motor (53) is connected to the rotating sleeve (52) for transmission through gear meshing. A propulsion mechanism (7) is provided inside the internal unit panel (42) below the drive panel base (51).

2. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: The lower drive assembly (3) provides rated driving force in the first stage of ultra-thin material grinding and polishing. At this time, each of the power fine-tuning units (5) is in a stopped state. A vision scanning module is provided outside the frame (1). The vision scanning module scans the ultra-thin material after the first stage of grinding and polishing with a high-definition camera to obtain the polished surface feature images of each ultra-thin material. A control module is provided on the frame (1). The control module performs image preprocessing on the polished surface feature images through an image processing unit to identify polished surface feature defect data. An evaluation and analysis module is provided outside the control module. The evaluation and analysis module compares the identified polished surface feature defect data with the database through a preset model and scores and classifies the feature defect data into the corresponding quality level, thereby outputting the defect quality level corresponding to each ultra-thin material polished surface. In the second stage, ultra-thin materials with the same defect quality level are sorted onto the same carrier mechanism (4). The control module indexes and calls up the corresponding grinding and polishing reference data according to the defect quality level, the surface characteristics of the polished part and the characteristics of the ultra-thin material. The power fine-tuning unit (5) provides the best working adjustment power to each carrier mechanism (4) based on the grinding and polishing reference data.

3. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: A motor (22) is fixed on the upper mounting bracket (2), and the output end of the motor (22) is connected to the main tray (21) for transmission through gear meshing.

4. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: The upper end of the main shaft (32) is threaded onto the main tray (21) and is rotatably connected to the main tray (21). A reduction gearbox (33) is installed inside the frame (1), and the reduction gearbox (33) is connected to the main shaft (32) for transmission via a transmission chain.

5. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: Multiple mounting rods (43) are fixed around the circumference of the inner unit plate (42). The upper end of the mounting rod (43) is fixed to the main tray (21). The connecting shaft (6) is rotatably connected to the inner unit plate (42) through a bearing. A central tooth is sleeved on the upper end of the connecting shaft (6). An inner tooth ring (44) is fixed on the main tray (21). Several sun teeth (45) are distributed between the central tooth and the inner tooth ring (44). A secondary tray (41) is coaxially fixed on the sun teeth (45).

6. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: The inner shaft (61) is fitted with a ratchet ring (63), and the outer shaft sleeve (62) has top teeth distributed around its inner circumference. The top teeth are in contact with the ratchet ring (63) through a spring. The rotation direction of the inner shaft (61) driven by the control motor (53) is opposite to the rotation direction of the outer bushing (62).

7. The lower drive assembly of a grinding or polishing machine according to claim 1, characterized in that: The propulsion mechanism (7) includes a fixed seat, which is fixed to the internal unit panel (42). A fixed plate (71) is slidably connected to the fixed seat via a support rod. A guide sleeve (72) is fixed on the fixed plate (71). A ring seat (73) is coaxially arranged on the guide sleeve (72). A connecting sleeve (74) is fixed above the ring seat (73). The connecting sleeve (74) is rotatably connected to the inner shaft rod (61) of the connecting shaft (6). A propulsion cylinder (75) is vertically mounted on the fixed base, and the telescopic end of the propulsion cylinder (75) is connected to the fixed plate (71).

8. The lower drive assembly of a grinding or polishing machine according to claim 7, characterized in that: The guide sleeve (72) is slidably connected to the ring seat (73). A support rod (76) is slidably connected inside the guide sleeve (72). A connecting sleeve (77) is rotatably connected inside the guide sleeve (72). The connecting sleeve (77) is rotatably sleeved on the outside of the support rod (76). A shaft pin is fixed on the side wall of the support rod (76). A guide groove is opened on the side wall of the connecting sleeve (77). One end of the shaft pin is slidably connected in the guide groove.

9. The lower drive assembly of a grinding or polishing machine according to claim 8, characterized in that: A forward and reverse motor is installed on the guide sleeve (72). The output end of the forward and reverse motor is fixed to the connecting sleeve (77) and drives the frame rod (76) to slide up and down through the connecting sleeve (77).

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