Automatic lifting positioning platform for welding of automobile motor stator

Abstract

The utility model discloses an automatic lifting and positioning platform for welding an automobile motor stator, and relates to the technical field of lifting and positioning platforms. Comprising a servo lifting mechanism, when an arranged threaded sleeve rotates under the action of a servo motor through a synchronous wheel and a synchronous belt and rotates on the upper end face of a large fixing plate, a base plate slides in a lifting mode on the large fixing plate and a first linear bearing through a guide rod under meshing transmission of a screw and the threaded sleeve, and the large fixing plate is driven to rotate. Therefore, the large bottom plate connected to the screw and the guide rod through the bolts is automatically lifted and adjusted, the lifting operation is more accurate and controllable, the large bottom plate is allowed to be automatically lifted and adjusted according to needs, the large bottom plate can adapt to different heights, the working efficiency is improved, extra stability and guiding effects are provided for the lifting process, and meanwhile the large bottom plate can be automatically lifted and adjusted. The first linear bearing further ensures the stability and reliability of the lifting process, and errors caused by shaking or deviation are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lifting positioning platform, concretely to a kind of automatic lifting positioning platform of automobile motor stator welding. BACKGROUND

[0002] The automatic lifting positioning platform of automobile motor stator welding is derived from the urgent demand of motor manufacturing industry for efficient and accurate welding technology. With the rapid development of new energy automobile industry, the performance and reliability of motor as the core power system become crucial. The welding quality of motor stator, as the core component of motor, directly affects the overall performance and quality of motor.

[0003] Traditional welding platform often relies on manual operation in terms of lifting adjustment, which is not only cumbersome to operate, but also difficult to ensure the accuracy and stability of lifting, leading to deviation in the position of workpiece during welding, thereby affecting the accuracy and aesthetics of welding. At the same time, manual adjustment also increases the labor intensity of operators and reduces work efficiency. Therefore, the utility model provides an automatic lifting positioning platform for automobile motor stator welding. SUMMARY

[0004] In view of the shortcomings of the prior art, the utility model provides an automatic lifting positioning platform for automobile motor stator welding, which solves the problem that traditional welding platform often relies on manual operation in terms of lifting adjustment, which is not only cumbersome to operate, but also difficult to ensure the accuracy and stability of lifting. This leads to deviation in the position of workpiece during welding, thereby affecting the accuracy and aesthetics of welding. At the same time, manual adjustment also increases the labor intensity of operators and reduces work efficiency.

[0005] To achieve the above purpose, the utility model is implemented by the following technical solutions: an automatic lifting positioning platform for automobile motor stator welding, comprising a servo lifting mechanism, a large fixed plate is fixed on the servo lifting mechanism, a moving mechanism for automobile motor stator welding is arranged on the large fixed plate, and the moving mechanism comprises:

[0006] The lifting assembly comprises a threaded sleeve connected to the large fixed plate through a transmission assembly, a screw is threadedly connected to the inside of the threaded sleeve, a fixed seat is fixed to the lower end of the screw, a base plate is fixed to the lower end of the fixed seat, and a fixed block is connected to the four ends of the base plate through a positioning assembly.

[0007] The translation assembly comprises an X-axis translation mechanism, the X-axis translation mechanism comprises a large bottom plate fixed on the upper end of the fixed block, the upper end of the large bottom plate is provided with a mounting block connected through a threaded assembly, the upper end of the mounting block is provided with a Y-axis translation mechanism, the Y-axis translation mechanism comprises a Y-axis bottom plate connected through bolts on the mounting block, and the upper end surface of the Y-axis bottom plate is provided with a second guide rail sliding block connected through a sliding assembly;

[0008] The support assembly comprises a jacking floating assembly arranged on the upper end of the second guide rail sliding block, the jacking floating assembly comprises a top end lower bottom plate fixed on the upper end of the second guide rail sliding block through bolts, and the upper end surface of the top end lower bottom plate is provided with a roller fixing plate connected through an elastic assembly.

[0009] Preferably, the transmission assembly comprises a servo motor fixed on the lower end of the large fixed plate, the output end of the servo motor is connected with two groups of synchronous wheels, the outer wall of the synchronous wheel is tightly fitted with a synchronous belt, the threaded sleeve is rotatably connected to the upper end surface of the large fixed plate, and the threaded sleeve is fixedly connected with the inner wall of the synchronous wheel.

[0010] Preferably, the positioning assembly comprises guide rods fixed on four ends of the base plate, the upper end surface of the large fixed plate is fixed with first linear bearings on four ends, the guide rods are in sliding connection with the first linear bearings and the large fixed plate, and the fixed block is fixedly connected to the upper end of the guide rods.

[0011] Preferably, the threaded assembly comprises a bearing with seat fixed on the upper end of the large bottom plate, a ball screw is arranged in the bearing with seat, the mounting block is threadedly connected to the outer wall of the ball screw, one end of the ball screw is provided with a hand wheel for driving, the upper end surface of the large bottom plate is fixed with two groups of first guide rail limiting blocks on one side, the inner wall of the first guide rail limiting block is provided with a first guide rail sliding block in sliding connection through a sliding rail seat, and the Y-axis bottom plate is connected to the upper end surface of the mounting block and the first guide rail sliding block through bolts.

[0012] Preferably, the sliding assembly comprises an organ case main body fixed on one end of the upper end of the Y-axis bottom plate, one end of the organ case main body is fixed with a second organ case fixing plate, the lower end of the second organ case fixing plate is fixedly connected with the Y-axis bottom plate, the other end of the organ case main body is fixed with a first organ case fixing plate, the first organ case fixing plate has an L-shaped structure, the upper end surface of the Y-axis bottom plate is fixed with two groups of supporting sliding rails, the outer wall of the supporting sliding rail is in sliding connection with a second guide rail sliding block, one end of the supporting sliding rail is fixed with a second guide rail limiting block, and the top end lower bottom plate is connected with the first organ case fixing plate and the second guide rail sliding block through bolts.

[0013] Preferably, the elastic assembly comprises a second linear bearing fixed at the upper end of the lower bottom plate at the top end, a positioning rod is slidably connected in the second linear bearing, a damping spring is fixedly connected to the inner ring of the positioning rod, a top end upper bottom plate is fixed to the upper end of the damping spring, a cylinder fixing plate is fixedly connected to the upper end of the top end upper bottom plate, four groups of rubberized cylinders are arranged on the inner wall of the cylinder fixing plate, a limiting block is fixed to one side wall of the cylinder fixing plate, and a knob plunger is arranged on the other side of the cylinder fixing plate.

[0014] Beneficial effects

[0015] The utility model provides a kind of automatic lifting positioning platform of automobile motor stator welding.Compared with prior art, it has the following beneficial effects:

[0016] First, the utility model when the threaded sleeve set is rotated under the action of servo motor by synchronous pulley and synchronous belt, the threaded sleeve is rotated on the upper end surface of large fixed plate, the base plate is lifted and slid on large fixed plate and first linear bearing by the engagement transmission of screw rod and threaded sleeve, so that the large bottom plate connected by bolt on screw rod and guide rod is automatically adjusted, so that lifting operation is more accurate and controllable, allowing large bottom plate to be automatically adjusted as needed, so as to adapt to different heights, improve work efficiency, and provide additional stability and guidance during lifting process, at the same time, the first linear bearing further ensures the stability and reliability of lifting process, reduces the error caused by shaking or deviation.

[0017] Second, the utility model is rotated on bearing with seat by hand wheel to ball screw, then Y-axis bottom plate is fixedly installed with mounting block and first guide rail slider by bolt, to realize horizontal adjustment of Y-axis bottom plate, which is simple and easy to operate, and has high precision, which helps to ensure the accuracy of workpiece position during welding, then when top end lower bottom plate slides on support slide rail by second guide rail slider, organ case main body can be telescopic, to protect support slide rail, prevent dust, debris and other impurities from entering the equipment, and realize the movable effect of top end lower bottom plate in vertical direction, through the cooperative work of threaded assembly and sliding assembly, the design makes the equipment can be flexibly adjusted according to different welding requirements, improves the versatility of the equipment, so that it can cope with more kinds of welding tasks. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of the utility model;

[0019] Figure 2 It is the structure schematic diagram of servo lifting mechanism of the utility model;

[0020] Figure 3The utility model discloses a X axis translation mechanism connecting structure schematic diagram of the utility model discloses a Y axis translation mechanism connecting structure schematic diagram.

[0021] Figure 4 The utility model discloses a Y axis translation mechanism connecting structure schematic diagram.

[0022] Figure 5 The utility model discloses a jacking floating subassembly structure schematic diagram

[0023] In the drawing: 1, servo lifting mechanism, 101, big fixed plate, 102, servo motor, 103, base plate, 104, guide rod, 105, fixed seat, 106, first linear bearing, 107, synchronous belt, 108, synchronous wheel, 109, fixed block, 1010, screw rod, 1011, threaded sleeve, 2, X axis translation mechanism, 201, big base plate, 202, hand wheel, 203, bearing with seat, 204, ball screw, 205, first guide rail sliding block, 206, first guide rail limit block, 207, mounting block, 3, Y axis translation mechanism, 301, Y axis base plate, 302, second guide rail sliding block, 303, second guide rail limit block, 304, first organ case fixed plate, 305, organ case main part, 306, second organ case fixed plate, 307, support slide rail, 4, jacking floating subassembly, 401, top lower base plate, 402, second linear bearing, 403, shock absorbing spring, 404, knob plunger, 405, positioning rod, 406, top upper base plate, 407, roller fixed plate, 408, rubber-coated roller, 409, limit stop. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the utility model.

[0025] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a kind of automatic lifting positioning platform for automobile motor stator welding, including servo lifting mechanism 1, servo lifting mechanism 1 is fixed with big fixed plate 101, big fixed plate 101 is provided with the moving mechanism for automobile motor stator welding, and the moving mechanism includes:

[0026] Lifting assembly, including big fixed plate 101 is provided with threaded sleeve 1011 connected by transmission assembly, the inside screw thread of threaded sleeve 1011 is connected with screw rod 1010, the lower end of screw rod 1010 is fixed with fixed seat 105, the lower end of fixed seat 105 is fixed with base plate 103, and the four ends of base plate 103 are provided with fixed block 109 connected by positioning assembly.

[0027] The translation assembly comprises an X-axis translation mechanism 2, the X-axis translation mechanism 2 comprises a large bottom plate 201 fixed on the upper end of the fixed block 109, the upper end of the large bottom plate 201 is provided with a mounting block 207 connected through a threaded assembly, the upper end of the mounting block 207 is provided with a Y-axis translation mechanism 3, the Y-axis translation mechanism 3 comprises a Y-axis bottom plate 301 provided on the mounting block 207 and connected through a bolt, and the upper end surface of the Y-axis bottom plate 301 is provided with a second guide rail sliding block 302 connected through a sliding assembly;

[0028] The support assembly comprises a jacking floating assembly 4 provided on the upper end of the second guide rail sliding block 302, the jacking floating assembly 4 comprises a top end lower bottom plate 401 fixed on the upper end of the second guide rail sliding block 302 through a bolt, and the upper end surface of the top end lower bottom plate 401 is provided with a roller fixing plate 407 connected through an elastic assembly.

[0029] In the preferred embodiment, the transmission assembly comprises a servo motor 102 fixed on the lower end of the large fixed plate 101, the output end of the servo motor 102 is connected with two groups of synchronous wheels 108, the outer wall of the synchronous wheels 108 is tightly fitted with a synchronous belt 107, a threaded sleeve 1011 is rotationally connected on the upper end surface of the large fixed plate 101, the threaded sleeve 1011 is fixedly connected with the inner wall of the synchronous wheels 108, the positioning assembly comprises guide rods 104 fixed on the four ends of the base plate 103, the upper end surface of the large fixed plate 101 is fixedly provided with first linear bearings 106 on the four ends, the guide rods 104 are in sliding connection with the first linear bearings 106 and the large fixed plate 101, the fixed block 109 is fixedly connected on the upper end of the guide rods 104, the large bottom plate 201 is fixedly connected with the top end of the screw rod 1010 through a bolt, the upper end of the guide rods 104 is fixedly connected with the lower end surface of the large bottom plate 201 through the fixed block 109 and a bolt, when the threaded sleeve 1011 rotates under the action of the servo motor 102 through the synchronous wheels 108 and the synchronous belt 107, the base plate 103 slides up and down on the large fixed plate 101 and the first linear bearings 106 through the guide rods 104 under the meshing transmission of the screw rod 1010 and the threaded sleeve 1011, thereby automatically adjusting the large bottom plate 201 fixedly connected with the screw rod 1010 and the guide rods 104 through a bolt, so that the lifting operation is more accurate and controllable, allowing the large bottom plate 201 to be automatically adjusted according to needs, thereby adapting to different heights, improving work efficiency, and providing additional stability and guidance during the lifting process. At the same time, the first linear bearings 106 further ensure the stability and reliability of the lifting process, reducing errors caused by shaking or deviation.

[0030] In the preferred implementation, the threaded assembly includes a large base plate 201 fixed at the upper end of the bearing 203, the inside of the bearing 203 is provided with a ball screw 204, the mounting block 207 is located on the outer wall of the ball screw 204 in threaded connection, one end of the ball screw 204 is provided with a hand wheel 202 for driving, the upper end of the large base plate 201 is fixed with two groups of first guide rail limit blocks 206, the inner wall of the first guide rail limit block 206 is provided with a first guide rail sliding block 205 connected by a sliding rail seat, the Y-axis bottom plate 301 is located on the upper end of the mounting block 207 and the first guide rail sliding block 205 and is connected by bolts, the ball screw 204 is rotated on the bearing 203 by the hand wheel 202, then the Y-axis bottom plate 301 is fixedly installed with the mounting block 207 and the first guide rail sliding block 205 by bolts, the horizontal direction adjustment of the Y-axis bottom plate 301 is realized, which is simple to operate, high in precision and helps to ensure the accuracy of the workpiece position during welding.

[0031] In the preferred implementation, the sliding assembly includes an organ case main body 305 fixed at one end of the upper end of the Y-axis bottom plate 301, one end of the organ case main body 305 is fixed with a second organ case fixed plate 306, the lower end of the second organ case fixed plate 306 is fixedly connected with the Y-axis bottom plate 301, the other end of the organ case main body 305 is fixed with a first organ case fixed plate 304, the first organ case fixed plate 304 is in L-shaped structure, two groups of support slide rails 307 are fixed on the upper end surface of the Y-axis bottom plate 301, the outer wall of the support slide rail 307 is slidably connected with a second guide rail sliding block 302, one end of the support slide rail 307 is fixed with a second guide rail limit block 303, the top end bottom plate 401 is connected with the first organ case fixed plate 304 and the second guide rail sliding block 302 by bolts, the top end bottom plate 401 is installed on the second guide rail sliding block 302 and the first organ case fixed plate 304 by bolts, then when the top end bottom plate 401 slides on the support slide rail 307 through the second guide rail sliding block 302, the organ case main body 305 can be telescopic, used for protecting the support slide rail 307, preventing dust, debris and other impurities from entering the inside of the equipment, and realizing the vertical movable action of the top end bottom plate 401, through the cooperation of the threaded assembly and the sliding assembly, the design makes the equipment can be flexibly adjusted according to different welding needs, improves the versatility of the equipment, so that it can cope with more kinds of welding tasks.

[0032] In the preferred implementation, the elastic assembly includes a second linear bearing 402 fixed at the top end of the top lower base plate 401, a positioning rod 405 slidingly connected inside the second linear bearing 402, a shock absorbing spring 403 fixedly connected to the inner ring of the positioning rod 405, a top upper base plate 406 fixed at the upper end of the shock absorbing spring 403, a roller fixing plate 407 fixedly connected to the upper end of the top upper base plate 406, four sets of rubber-coated rollers 408 arranged on the inner wall of the roller fixing plate 407, a limiting block 409 fixed to one side wall of the roller fixing plate 407, and a knob plunger 404 arranged on the other side of the roller fixing plate 407. In the automatic lifting positioning platform for welding automobile motor stators, the top lower base plate 401 is slidingly connected to the positioning rod 405 through the second linear bearing 402. When the platform needs to be lifted and positioned, the positioning rod 405 slides up and down inside the second linear bearing 402. The shock absorbing spring 403 is connected between the inner ring of the positioning rod 405 and the top upper base plate 406, which absorbs and buffers the vibration and impact that may occur during lifting, ensuring the stability of positioning. The roller fixing plate 407 is fixed with four sets of rubber-coated rollers 408, which are used to support and position the automobile motor stator to be welded. The limiting block 409 is arranged on one side of the roller fixing plate 407 to limit the movement range of the workpiece to be welded, ensuring its stability during welding. The knob plunger 404 is arranged on the other side of the roller fixing plate 407, which can fine-tune the position of the roller fixing plate 407 and the rubber-coated rollers 408 on it by rotating the plunger, so as to adapt to workpieces of different sizes and shapes.

[0033] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0034] When working, firstly, when the threaded sleeve 1011 rotates under the action of the servo motor 102 through the synchronous wheel 108 and the synchronous belt 107, the base plate 103 slides up and down on the large fixed plate 101 and the first linear bearing 106 through the meshing transmission of the screw rod 1010 and the threaded sleeve 1011, so as to automatically adjust the large base plate 201 connected to the screw rod 1010 and the guide rod 104 through the bolts, then the hand wheel 202 rotates the ball screw 204 on the bearing 203, then the Y-axis base plate 301 is fixedly installed with the mounting block 207 and the first guide rail sliding block 205 through bolts, realizing the horizontal adjustment of the Y-axis base plate 301, and the top lower base plate 401 is installed on the second guide rail sliding block 302 and the first organ case fixed plate 304 through bolts, then when the top lower base plate 401 slides on the support sliding rail 307 through the second guide rail sliding block 302, the organ case main body 305 can be telescopic, which is used for protecting the support sliding rail 307 from dust, debris and other impurities entering the equipment, and realizing the movable effect of the top lower base plate 401 in the vertical direction. Through the cooperative work of the threaded assembly and the sliding assembly, the device can be flexibly adjusted according to different welding requirements.

[0035] When the platform needs to be positioned, the positioning rod 405 slides up and down in the second linear bearing 402, the damping spring 403 is connected between the inner circle of the positioning rod 405 and the top upper base plate 406, which is used to absorb and buffer the vibration and impact that may occur during lifting, to ensure the stability of positioning, the four sets of rubber rollers 408 are fixed on the roller fixed plate 407, which are used to support and position the automobile motor stator to be welded, the limiting block 409 is arranged on one side of the roller fixed plate 407, which is used to limit the movement range of the workpiece to be welded, to ensure its stability during welding, and the knob plunger 404 is arranged on the other side of the roller fixed plate 407, which can fine-tune the position of the roller fixed plate 407 and the rubber rollers 408 thereon through the rotating plunger, to adapt to workpieces of different sizes and shapes.

[0036] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0037] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An automatic lifting positioning platform for welding of an automobile motor stator, comprising a servo lifting mechanism (1), a large fixed plate (101) is fixed on the servo lifting mechanism (1), characterized in that: The large fixed plate (101) is provided with a moving mechanism for welding of the automobile motor stator, and the moving mechanism comprises: The lifting assembly comprises a threaded sleeve (1011) provided on the large fixed plate (101) and connected through a transmission assembly, the inside of the threaded sleeve (1011) is threadedly connected with a screw rod (1010), the lower end of the screw rod (1010) is fixedly connected with a fixed seat (105), the lower end of the fixed seat (105) is fixedly connected with a base plate (103), and four ends of the base plate (103) are provided with fixed blocks (109) connected through a positioning assembly; The translation assembly comprises an X-axis translation mechanism (2), the X-axis translation mechanism (2) comprises a large base plate (201) fixedly connected to the upper end of the fixed block (109), the upper end of the large base plate (201) is provided with a mounting block (207) connected through a threaded assembly, the upper end of the mounting block (207) is provided with a Y-axis translation mechanism (3), the Y-axis translation mechanism (3) comprises a Y-axis base plate (301) provided on the mounting block (207) and connected through a bolt, and the upper end surface of the Y-axis base plate (301) is provided with a second guide rail sliding block (302) connected through a sliding assembly; The supporting assembly comprises a jacking floating assembly (4) provided on the upper end of the second guide rail sliding block (302), the jacking floating assembly (4) comprises a top end lower base plate (401) fixedly connected to the upper end of the second guide rail sliding block (302) through a bolt, and the upper end surface of the top end lower base plate (401) is provided with a roller fixed plate (407) connected through an elastic assembly.

2. The automatic lifting positioning platform for welding of an automobile motor stator according to claim 1, characterized in that: The transmission assembly comprises a servo motor (102) fixedly connected to the lower end of the large fixed plate (101), the output end of the servo motor (102) is connected with two groups of synchronous wheels (108), the outer wall of the synchronous wheel (108) is tightly fitted with a synchronous belt (107), the threaded sleeve (1011) is rotationally connected to the upper end surface of the large fixed plate (101), and the threaded sleeve (1011) is fixedly connected with the inner wall of the synchronous wheel (108).

3. The automatic lifting positioning platform for welding of an automobile motor stator of claim 1, characterized in that: The positioning assembly comprises guide rods (104) fixedly connected to four ends of the base plate (103), the upper end surface of the large fixed plate (101) is fixedly connected with first linear bearings (106) at four ends, the guide rods (104) are in sliding connection with the first linear bearings (106) and the large fixed plate (101), and the fixed blocks (109) are fixedly connected to the upper ends of the guide rods (104).

4. The automatic lifting positioning platform for welding of an automobile motor stator of claim 1, characterized in that: The threaded assembly includes the seat bearing (203) fixed on the upper end of the large bottom plate (201), the inside of the seat bearing (203) is provided with a ball screw (204), the mounting block (207) is located on the outer wall of the ball screw (204) and is connected in a threaded manner, one end of the ball screw (204) is provided with a hand wheel (202) for driving, one side end of the upper end surface of the large bottom plate (201) is fixed with two groups of first guide rail limiting blocks (206), the inner wall of the first guide rail limiting block (206) is provided with a first guide rail sliding block (205) connected in a sliding manner through a slide rail seat, and the Y-axis bottom plate (301) is located on the upper end surface of the mounting block (207) and the first guide rail sliding block (205) and is connected through bolts.

5. The automatic lifting positioning platform for welding of an automobile motor stator of claim 1, characterized in that: The sliding assembly includes the organ case main body (305) fixed on one end of the upper end of the Y-axis bottom plate (301), one end of the organ case main body (305) is fixed with a second organ case fixed plate (306), the lower end of the second organ case fixed plate (306) is fixedly connected with the Y-axis bottom plate (301), the other end of the organ case main body (305) is fixed with a first organ case fixed plate (304), the first organ case fixed plate (304) is in an L-shaped structure, the upper end surface of the Y-axis bottom plate (301) is fixed with two groups of supporting slide rails (307), the outer wall of the supporting slide rail (307) is slidably connected with a second guide rail sliding block (302), one end of the supporting slide rail (307) is fixed with a second guide rail limiting block (303), and the top lower bottom plate (401) is connected with the first organ case fixed plate (304) and the second guide rail sliding block (302) through bolts.

6. The automatic lifting positioning platform for welding of an automobile motor stator of claim 1, wherein: The elastic assembly includes the second linear bearing (402) fixed on the upper end of the top lower bottom plate (401), the inside of the second linear bearing (402) is slidably connected with a positioning rod (405), the inner ring of the positioning rod (405) is fixedly connected with a shock absorbing spring (403), the upper end of the shock absorbing spring (403) is fixed with a top upper bottom plate (406), the drum fixed plate (407) is fixedly connected on the upper end of the top upper bottom plate (406), the inner wall of the drum fixed plate (407) is provided with four groups of rubber-coated rollers (408), one side wall of the drum fixed plate (407) is fixed with a limiting block (409), and the other side of the drum fixed plate (407) is provided with a knob plunger (404).

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