Automatic belt conveyor

Abstract

The invention provides an automatic belt conveyor which comprises a material frame used for hanging belts, a conveying mechanism used for conveying the belts on the material frame to a temporary storage support and a discharging mechanism used for detaching the belts on the temporary storage support, and the belts hung on the material frame side by side are conveyed forwards to the temporary storage support one by one through the conveying mechanism. The discharging structure comprises a pair of first push rods and a pair of second push rods, the first push rods push the cache support to be close to the receiving device, the second push rods push the shifting blocks to detach the belt on the cache support and install the belt on the receiving device, the belt enters the follow-up procedure, automatic conveying, loading and unloading of the belt are achieved, manual operation is reduced, and production efficiency is improved.

Description

Technical Field

[0001] The invention relates to an automatic belt conveyor. Background Art

[0002] Belts are indispensable components in the transmission of mechanical equipment and occupy an important position in the transmission system. However, belt production belongs to the traditional industry and most of them still retain manual operation, which has problems such as high labor costs and low production efficiency. With the continuous development of my country's industrialization process, various enterprises have carried out factory transformation and technology upgrades accordingly, and gradually built smart factories in line with the trend of the times, using automated or semi-automated production equipment to gradually replace manual operations. Therefore, the degree of automation in factory production is getting higher and higher, which reduces labor costs on the one hand and improves factory production efficiency and working environment on the other.

[0003] Therefore, in the traditional belt production process, reducing manual operations and providing automated or semi-automated production equipment are the primary directions for factory improvement. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an automatic belt conveyor, including a material rack for hanging belts, a conveying mechanism for conveying the belts on the material rack to a cache bracket, and a unloading mechanism for detaching the belts on the cache bracket. The belts hung in parallel on the material rack are conveyed forward one by one to the cache bracket through the conveying mechanism, and the belts on the cache bracket are pushed onto a receiving device through the unloading mechanism for subsequent procedures, such as detection, etc., thereby realizing automatic conveying and loading and unloading of the belts, reducing manual operations, and improving production efficiency.

[0005] The material rack is provided with a material rack beam extending along the unloading direction, the material rack beam is installed on the material rack mounting bracket, the conveying mechanism and the unloading mechanism are installed on the material rack beam, the conveying mechanism is located above the unloading structure, the unloading mechanism includes a unloading cylinder, a push rod rear connecting plate, a push rod fixing block, a push rod front connecting plate and a shift block connecting plate, which are distributed in sequence along the unloading direction, and a pair of first push rods and a pair of second push rods. The unloading cylinder is fixed to the material rack beam through a cylinder fixing plate, and the cylinder rod is fixedly connected to the push rod rear connecting plate through a floating joint. The rear portion of the first push rod can slide through the push rod The rear connecting plate, the rear end of the second push rod is fixedly mounted on the push rod rear connecting plate, the front end of the first push rod is fixedly mounted on the push rod front mounting plate, the front part of the second push rod can slide through the push rod front mounting plate, the first push rod and the second push rod both slide through the push rod fixing block and are supported by the push rod fixing block, the push rod fixing block is fixedly mounted on the material rack beam, the shift block connecting plate is fixedly mounted on the front end of the second push rod, the buffer bracket is fixedly mounted on the push rod front connecting plate at the front end of the unloading structure, a pair of shift blocks are installed on the upper front end of the shift block connecting plate, and the shift blocks are located on the left and right sides of the buffer bracket. The two-stage push rod is used to remove the belt, so that the belt is transported to the receiving wheel and then removed to prevent the belt from falling.

[0006] A first limit block is installed between the front connecting plate and the fixed block of the push rod on the first push rod of the unloading mechanism to limit excessive forward movement of the push rod, and a third limit block is installed at the rear end to limit the first push rod from falling off.

[0007] A fourth limiting block is arranged on the second push rod of the unloading mechanism between the push rod front connecting plate and the push rod fixing block to limit the relative backward movement position between the first push rod and the second push rod.

[0008] A positioning column is arranged on the left and right sides of the front end surface of the unloading mechanism. On the one hand, it detects that the buffer bracket has moved into place, and on the other hand, it supports the width of the belt on the buffer bracket to facilitate pushing it onto the receiving wheel.

[0009] The conveying mechanism includes a driving mechanism and a moving mechanism. The driving mechanism is used to drive the moving mechanism to move back and forth along the unloading direction. The driving mechanism includes a motor, a third pulley, a fourth pulley and a second transmission belt. The third pulley and the fourth pulley are connected by the second transmission belt. The motor is connected to the fourth pulley. The third pulley is installed at the rear end of the material rack beam through a first bearing and is coaxially connected to the driving wheel of the moving mechanism. The motor is fixedly installed on the motor bracket.

[0010] The moving mechanism includes a first pulley, a first transmission belt, a slider and a second pulley. The first pulley and the second pulley are respectively installed at the front and rear of the material rack beam and are located between a pair of upper guide rails. The slider is fastened to the first transmission belt through a slider fixing block and slides back and forth along the entire length of the upper guide rail.

[0011] The slider is a U-shaped structure with an opening downward, spanning the upper guide rails on the left and right. The moving mechanism also includes a pair of limit plates, which extend along the length direction of the upper guide rod. The limit plates are supported on the bottom surfaces of the left and right U-shaped structures of the limit plates. The two inner side surfaces of the slider are in sliding contact with the outer side surfaces of the left and right upper guide rails.

[0012] In order to facilitate loading, a rotating mechanism is also provided. When loading, the material rack is rotated 90° away from the working position to load the material, which is convenient for operation.

[0013] By adopting the technical solution of the present invention, automatic conveying and loading and unloading of the belt can be realized, manual operation can be reduced, and production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , 3D schematic diagram of automatic belt conveyor;

[0015] Figure 2 , material rack mounting bracket;

[0016] Figure 3 , material rack;

[0017] Figure 4 , conveying mechanism;

[0018] Figure 5 , unloading mechanism;

[0019] Figure 6 ,for Figure 5 A partial enlarged view (the direction has been changed for easier understanding);

[0020] In the figure: 100, material rack mounting bracket; 200, material rack; 300, conveying mechanism; 400, unloading mechanism; 500, receiving wheel; 600, belt; 700, buffer bracket; 101, column; 102, rotating mechanism support plate; 103, limit cylinder; 104, rotating shaft; 105, upper bearing of material rack; 106, material rack support plate; 107, limit seat; 108, lower bearing of material rack; 109, V-shaped limit block; 110, adjustment block; 111, foot support; 201, material rack beam; 202, upper guide rail; 203, lower guide rail; 204, lower guide rail support plate; 205, rear opening; 206, front opening; 207, rear bottom plate of material rack beam; 208, front bottom plate of material rack beam; 301, first pulley; 30 2. First transmission belt; 303. Slider; 304. Slider fixing block; 305. First bearing; 306. Third pulley; 307. Second transmission belt; 308. Fourth pulley; 309. Motor bracket; 310. Motor, 311. Second pulley; 312. Limit plate; 401. Discharge cylinder; 402. Push rod rear connecting plate; 403. Second push rod; 404. First push rod; 405. Push rod fixing block; 406. Push rod front connecting plate; 407. Shift block connecting plate; 409. Shift block; 410. Positioning column; 411. First limit block; 413. Third limit block; 414. Floating joint; 415. Front fixing plate; 416. Rear fixing plate; 417. Fourth limit block; 418. Positioning block. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention provides a simple definition of front and back. The front refers to the conveyor conveying forward direction, the back is the opposite direction, and the left refers to the conveyor conveying forward direction. Figures 1 to 5 The placement method is toward the inward direction of the plane, and the right is the opposite direction. This definition is only to facilitate a better understanding of the present invention based on the diagram, and is not a limitation of the present invention. Any changes or substitutions made here without creative labor are within the scope of protection of the present invention.

[0022] like Figures 1 to 6 As shown, the automatic belt conveyor includes a material rack mounting bracket 100, a material rack 200, a conveying mechanism 300 and a unloading mechanism 400. The cut belts 600 are hung in parallel on the material rack 200. The conveying mechanism 300 conveys the belts placed on the material rack one by one to the buffer bracket 700 located at the end of the conveying mechanism. The unloading mechanism 400 removes the belts on the buffer bracket 700 and assembles them to the receiving position of the corresponding equipment, such as the receiving wheel 500.

[0023] The rack 200 includes a rack beam 201, which can be welded from square steel and corresponding plates. The rack beam rear bottom plate 207 is installed on the rack mounting bracket 100 through the plate-mounted rack beam rear bottom plate 207 at the rear end (the end close to the rack mounting bracket 100), so that the rack beam 201 is parallel to the ground as a whole, which is convenient for hanging the belt. The rack 200 also includes a guide rail assembly, which is parallel to the rack beam and installed on the rack beam 201. The guide rail assembly includes a pair of upper guide rails 202 arranged in parallel on the left and right sides. The left and right upper guide rails are fixed above the rack beam 201 through a fixing plate or a bracket, and the spacing between the left and right guide rails is set according to the conditions of the belt or the corresponding receiving device. The guide rail assembly also includes a pair of lower guide rails 203, which are located on the left and right sides of the rack beam. The left and right lower rails 203 are respectively located obliquely below the left and right upper rails 201. The width of the lower rails is greater than the width of the rack beam, and the width of the upper rails is less than the width of the rack beam. They are located above the rack, which is convenient for the belt to be suspended and transported in an arc shape. Each lower rail 203 is installed on the side of the rack beam 201 through the lower rail support plates 204 arranged at the front and rear. The rack also includes a rack beam front bottom plate 208 welded to the bottom of the front end of the rack beam 201, which is used to fix the unloading equipment and sensors, etc.

[0024] The conveying mechanism 300 includes a driving mechanism and a moving mechanism. The driving mechanism is used to drive the moving mechanism to move forward and backward along the material rack so that the belts move forward one by one. The driving mechanism includes a motor 310, a third pulley 306, a fourth pulley 308 and a second transmission belt 307. The second transmission belt 307 is installed on the third pulley 306 and the fourth pulley 308. The fourth pulley 308 is connected to the motor 310, and the motor 310 is a reduction motor. The third pulley 306 is installed at the rear end of the material rack beam 201 through the first bearing 305. The fourth pulley is driven to rotate by the motor 310, and then the third pulley 306 is driven to rotate through the second transmission belt 307, and the moving mechanism is driven to move by the third pulley 306.

[0025] The mobile mechanism includes a first pulley 301, a first transmission belt 302, a slider 303, a slider fixing block 304 and a second pulley 311. The second pulley 301 is a driving wheel of the mobile mechanism. The transmission direction of the first transmission belt 302 is parallel to the rack beam 201. Specifically, a rear opening 205 is provided at the upper part of the rear end of the square steel of the rack beam 201, and a second pulley 311 is installed inside the rear opening. First bearings 305 are installed on the left and right sides of the opening. A third pulley 306 is coaxially installed on the outer side of one of the first bearings, so that the movement on the driving mechanism drives the second pulley 311 to be transmitted to the mobile mechanism through the third pulley 306. A front opening 206 is provided at the front end of the rack beam 201, and the first pulley 301 is installed in the front opening 206 through an axis, and the first transmission belt 302 is installed on the first pulley 301 and the second pulley 311. The slider fixing block 304 can be divided into two parts, and the upper and lower parts relatively clamp the belt so that the slider fixing block 304 is fixedly connected to the surface of the first transmission belt 302. The belt is an open belt and is spliced ​​and installed through the slider fixing block 304. In order to ensure the precise movement of the belt, the belt is preferably a timing transmission belt. In order to prevent the slider fixing block 304 from sliding relative to the first transmission belt 302 due to excessive load, the slider fixing block 304 is provided with a corresponding groove at the tooth contact part of the first transmission belt, so that the teeth of the first transmission belt are stuck in the groove for fixing, thereby preventing relative movement between the two. The top surface of the slider fixing block is provided with a plurality of threaded holes, and the slider 303 is provided with corresponding through holes, and the slider 303 is fastened to the slider fixing block 304 by bolts. The slider 303 is a downward U-shaped opening structure, spanning the left and right upper rails, and its width is slightly larger than the width of the belt hanging on the rack 200. The inner side of the opening of the slider 303 is limited by the side of the left and right upper rails to move left and right. The inner upper bottom surface of the opening of the slider 303 is slightly higher than or close to the upper surface of the left and right upper rails, so that the slider 303 slides along the upper rails. The limit plate 312 is fixedly installed on the rack beam, located below the two sides of the U-shaped opening of the slider. The slider is slidably supported on the limit plate 312 to limit the forward and backward movement trajectory of the slider. The belt is located on the rack, and the nearest belt at the proximal end is close to the distal end surface of the slider 303. When the control program controls the motor 310 to drive the fourth pulley 308 to rotate, the fourth pulley 308 drives the second transmission belt 307 to rotate and then drives the third pulley 306 to rotate; further, the third pulley 306 drives the second pulley 311 to rotate, and the first transmission belt 302 drives the slider to move to the far end, and the slider drives the belt to move forward, and the belts are transported one by one to the buffer bracket 700 at the end of the conveying device. The working stroke of the motor is controlled by the control program, and after a single belt is transported to the buffer bracket 700, the unloading mechanism 400 is started to work. The motor 310 can be fixed on the material rack mounting bracket through the L-shaped motor bracket 309.To protect the second transmission belt 307, a protective cover can be arranged around the second transmission belt 307. The protective cover is a box-shaped structure, one end of which is fixed to the material rack beam 201 and the other end is fixed to the motor bracket 309, so that the fourth pulley 308, the second transmission belt 307 and the third pulley 306 are isolated from the outside world.

[0026] The moving mechanism can also be driven by a chain, that is, the first pulley and the second pulley are sprockets, and the first transmission belt is a transmission chain.

[0027] The unloading mechanism 400 is installed on the lower side of the rack beam 201, and is arranged in parallel with the conveying mechanism 300, and is respectively located on the upper and lower sides of the rack beam 201 to avoid interference between the two moving mechanisms. The unloading mechanism 400 includes a unloading cylinder 401, which is installed at one end close to the rack and fixed to the rack beam through a cylinder fixing plate. Specifically, one end is fixed to the lower surface of the rack beam through a rear fixing plate 416, and the other end is fixed to the lower surface of the rack beam through an L-shaped front fixing plate 415. The end of the cylinder rod is connected to the push rod rear connecting plate 402 through a floating joint 414, pushing the push rod rear connecting plate to move in the front and rear directions. The unloading mechanism 400 also includes a pair of first push rods 404, a pair of second push rods 403, a push rod fixing block 405, a push rod front connecting plate 406, a shift block connecting plate 407, and corresponding limit blocks installed on the push rods. The push rod rear connecting plate 402, the push rod fixing block 405, the push rod front connecting plate 406 and the shifting block connecting plate 407 are sequentially spaced and distributed along the forward direction of the unloading mechanism. Specifically, a pair of first push rods 404 and a pair of second push rods 403 are arranged parallel to each other. To avoid interference, the spacing between the pair of first push rods is larger than the spacing between the pair of second push rods, that is, the first push rod is located at an obliquely upper position of the second push rod. The tail end of the second push rod 403 is fixed on the push rod rear connecting plate 402, the tail of the first push rod 404 is slidably mounted on the push rod rear connecting plate 402, the rear end of the first push rod 404 extends out of the rear connecting plate, and the rear end of the first push rod 404 is installed with a third limit block 413. The front part of the second push rod 403 is slidably mounted on the front push rod connecting plate 406, the front part of the second push rod 403 extends out of the front push rod connecting plate 406, and the front end is fixedly connected to the shifting block connecting plate 407. A fourth stopper 417 is installed on the second push rod 403 between the push rod front connecting plate 406 and the shift block connecting plate 407, which is used to limit the second push rod when it moves backward. The front and rear ends of the first push rod 404 are fixedly installed on the push rod front connecting plate 406. Both the first push rod 404 and the second push rod 403 can slide through a push rod fixing block 405 having a certain length along the length direction of the unloading direction. The push rod fixing block 405 is fixedly installed on the rack beam 201 or on the rack beam front bottom plate 208 of the rack beam 201, and is used to support and guide the movement of the first push rod and the second push rod. The first push rod 404 is provided with a first stopper 411 at the part between the push rod fixing block 405 and the push rod front connecting plate 406. When the unloading cylinder returns, when the first stopper 411 contacts the push rod fixing block 405, the first push rod stops moving backward. A shift block 409 is provided on the top of the shift block connecting plate 407.

[0028] The buffer bracket 700 is located at the front end of the unloading mechanism, fixedly mounted on the push rod front connecting plate 406, with a width smaller than the width of the guide rail, and is used to receive a single belt that falls off from the conveying mechanism. In order to prevent the belt from falling off when the conveying mechanism falls off, the front tail end of the buffer bracket 700 can be provided with an upwardly extending flange, with a transitional arc of the flange, and a height of about half a belt to one and a half belt thickness. A pair of positioning columns 410 are also provided on the front end surface of the push rod front connecting plate 406, and are arranged left and right along the push rod front connecting plate. When the push rod drives the push rod front connecting plate 406 to move forward, when the end surface of the positioning column 410 contacts the mounting plate of the receiving wheel 500, the first push rod stops moving forward. The shifting block 409 is located on the left and right sides of the buffer rack 700. When the shifting block 409 is located at the rear position, that is, when the first push rod stops, the front end surface is flush with the front end of the upper guide rail or slightly backward to prevent blocking the belt conveyed by the conveying mechanism. A shift block 409 is extended from the front end of the buffer bracket 700, which is about the width of one to two belts and is used to hang the belt. A positioning block 418 is installed on the shift block connecting plate on the lower side of the buffer material rack. The positioning block 418 is coaxially arranged with the receiving wheel, and the buffer material rack extends out of the positioning block and is higher than the receiving wheel. When the first push rod stops, the positioning block 418 contacts the end face of the pulley. The unloading cylinder continues to move forward, the second push rod pushes the shift block connecting plate forward, and the shift block 409 pushes the belt off the buffer material rack 700 to the receiving wheel.

[0029] In order to facilitate the loading of the material rack 200, the material rack mounting bracket 100 can be configured to include a column 101, the lower end of the column 101 can be adjusted in height by an adjustment block, and fixed by a foot support 111. A rotating mechanism is provided at the upper end of the column 101. Specifically, a rotating mechanism support plate 102 is horizontally provided at the top of the column 101, and the rotating mechanism includes a limit cylinder 103, a rotating shaft 104, an upper bearing 105 of the material rack, and a lower bearing 108 of the material rack. The lower end plate of the bearing is fixedly mounted on the upper bottom surface of the rotating mechanism support plate 102, and the lower end plate of the bearing is provided with a bearing mounting hole, and the rotating shaft 104 is vertically and rotatably inserted into the bearing mounting hole. The upper bearing 105 of the material rack and the lower bearing 108 of the material rack are respectively located at the upper and lower ends of the rotating shaft 104, and the rotating shaft 104 is installed in the upper and lower bearings of the material rack. The upper bearing 105 and the lower bearing 108 of the material rack are fixed on the material rack support plate 106 at the same time. The material rack support plate 106 can be an L-shaped structure, the vertical surface is used to install the material rack bearing, and the upper bottom surface is fixed on the material rack beam 201 or the rear bottom plate 207 of the material rack beam. A limit seat 107 is arranged between the upper bearing and the lower bearing of the material rack, and the limit seat 107 is fixedly installed on the vertical surface of the material rack support plate 106. The limit cylinder 103 is installed on the upper surface of the rotating mechanism support plate 102 on the opposite side of the material rack support plate. The limit cylinder 103 is fixed on the rotating mechanism support plate 102 through a bracket. A V-shaped limit block 109 is installed at the tail end of the cylinder rod of the limit cylinder 103, and a V-shaped groove is correspondingly arranged on the limit seat 107. When the V-shaped limit block is inserted into the V-shaped groove, the material rack is fixed. When the limit cylinder returns to its original position, the V-shaped limit block exits the V-shaped groove, and the rotating shaft can drive the entire material rack 200 to rotate, so as to facilitate material loading.

Claims

1. A belt conveyor, comprising a material rack for hanging a belt, a conveying mechanism for conveying the belt on the material rack to a buffer bracket, and a discharging mechanism for removing the belt from the buffer bracket, characterized in that: The material rack is provided with a material rack beam extending along the unloading direction, the material rack beam is installed on the material rack mounting bracket, the conveying mechanism and the unloading mechanism are installed on the material rack beam, the conveying mechanism is located above the unloading structure, and the unloading mechanism includes a unloading cylinder, a push rod rear connecting plate, a push rod fixing block, a push rod front connecting plate and a shift block connecting plate, which are sequentially distributed along the unloading direction, and a pair of first push rods and a pair of second push rods. Both ends of the unloading cylinder are fixed to the material rack beam through a cylinder fixing plate, and the cylinder rod is fixedly connected to the push rod rear connecting plate through a floating joint. The rear portion of the first push rod can slide through the push rod The rear connecting plate of the rod, the rear end of the second push rod is fixedly mounted on the rear connecting plate of the push rod, the front end of the first push rod is fixedly mounted on the front mounting plate of the push rod, the front part of the second push rod can slide through the front mounting plate of the push rod, the first push rod and the second push rod both slide through the push rod fixing block and are supported by the push rod fixing block, the push rod fixing block is fixedly mounted on the material rack beam, the shift block connecting plate is fixedly mounted on the front end of the second push rod, the cache bracket is fixedly mounted on the front connecting plate of the push rod, and is located at the front end of the unloading mechanism, a pair of shift blocks are installed on the upper part of the front end of the shift block connecting plate, and the shift blocks are located on the left and right sides of the cache bracket.

2. The belt conveyor according to claim 1, characterized in that: The unloading mechanism is also provided with a limit block, and the first push rod is installed with a first limit block and a third limit block, the first limit block is located between the front connecting plate of the push rod and the push rod fixing block, and the third limit block is located at the rear end of the first push rod.

3. The belt conveyor according to claim 2, characterized in that: The second push rod is equipped with a fourth limit block, and the fourth limit block is located between the shift block connecting plate and the push rod front connecting plate.

4. The belt conveyor according to claim 3, characterized in that: The unloading structure also includes a pair of positioning columns, which are installed on the front end surface of the front connecting plate of the push rod and are arranged on the left and right sides.

5. The belt conveyor according to claim 1, characterized in that: The material rack includes a material rack beam, a pair of upper guide rails and a pair of lower guide rails. The upper guide rails are arranged in parallel with the lower guide rails and installed on the material rack beam. The two lower guide rails are respectively located on the left and right sides of the material rack beam, and the two upper guide rails are located above the material rack beam.

6. The belt conveyor according to claim 5, characterized in that: The conveying mechanism includes a driving mechanism and a moving mechanism, the driving mechanism is used to drive the moving mechanism to move back and forth along the unloading direction, the driving mechanism includes a motor, a third pulley, a fourth pulley and a second transmission belt, the third pulley and the fourth pulley are connected by the second transmission belt, the motor is connected to the fourth pulley, the third pulley is installed at the rear end of the material rack beam through a first bearing, and is coaxially connected to the driving wheel of the moving mechanism, and the motor is fixedly installed on the motor bracket.

7. The belt conveyor according to claim 6, characterized in that: The moving mechanism includes a first pulley, a first transmission belt, a slider and a second pulley. The first pulley and the second pulley are respectively installed at the front and rear of the material rack beam and are located between a pair of upper guide rails. The slider is fastened to the first transmission belt through a slider fixing block and slides back and forth along the entire length of the upper guide rail.

8. The belt conveyor according to claim 7, characterized in that: The slider is a U-shaped structure with an opening downward, spanning the upper guide rails on the left and right. The moving mechanism also includes a pair of limit plates, which extend along the length direction of the upper guide rod. The limit plates are supported on the bottom surfaces of the left and right U-shaped structures of the limit plates. The two inner side surfaces of the slider are in sliding contact with the outer side surfaces of the left and right upper guide rails.

9. The belt conveyor according to claims 1 to 8, characterized in that: The material rack mounting bracket includes a column and a rotating mechanism support plate fixed on the top of the column, the rotating mechanism includes a limit cylinder, a rotating shaft, an upper bearing of the material rack, a lower bearing of the material rack, a material rack support plate, a V-shaped limit block and a limit seat, the limit cylinder and the lower end plate of the bearing are fixedly mounted on the rotating mechanism support plate, the upper bearing of the material rack and the lower bearing of the material rack are fixedly mounted on the material rack support plate, the rotating shaft is mounted on the upper bearing of the material rack and the lower bearing of the material rack, the lower end of the rotating shaft is rotatably mounted in the bearing mounting hole of the lower end plate of the bearing, a limit seat is fixedly provided on the material rack support plate, the limit cylinder is connected with a V-shaped block, and the limit seat is provided with a V-shaped groove cooperating with the V-shaped block.

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