Spacing-adjustable roller structure of automobile production line

Abstract

The utility model discloses a spacing-adjustable roller structure of an automobile production line, and relates to the technical field of automobile production lines. The device comprises a main frame mechanism, the main frame mechanism comprises a supporting base, a supporting plate is arranged at the top of the supporting base, a locking assembly is arranged at the top of the supporting plate, and an adjusting assembly is arranged at the bottom of the supporting plate. The adjusting assembly is arranged, specifically, a second motor is started to drive a second bevel gear and a third bevel gear to rotate reversely, at the moment, a hollow rotating shaft and a second rotating shaft can drive a second supporting rod and a first supporting rod to rotate, and at the moment, four sliding blocks slide in a first sliding rail and a second sliding rail to drive a movable supporting frame to move; when the movable supporting frame moves, the two adjusting rollers are driven to adjust, so that the time and the workload for large-scale adjustment of the whole production line due to vehicle type replacement are reduced, the downtime of equipment is shortened, and the utilization rate and the production efficiency of the production line are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile production line, especially adjustable interval formula roller structure of automobile production line. BACKGROUND

[0002] In early automobile production line, the interval of roller is usually fixed, and this kind of fixed interval design is relatively rigid when facing different vehicle models and different production demands. With the continuous development of automobile market, the demand of consumers for automobiles is more and more diversified, and automobile manufacturers need to produce various automobile models and specifications. Therefore, the traditional roller is not adjustable, which increases the time and workload of large-scale adjustment of the entire production line due to the replacement of vehicle models, greatly increases the equipment downtime, and greatly reduces the utilization rate and production efficiency of the production line. Therefore, an adjustable interval formula roller structure for automobile production line is proposed. SUMMARY

[0003] The utility model discloses a kind of adjustable interval formula roller structures of automobile production line, by setting adjusting assembly, specifically is to start motor two with bevel gear two and bevel gear three are reversed rotation, hollow shaft and shaft two will drive support rod two and support rod one to rotate, when it is moved support frame is moved by the effect that four sliding blocks slide inside slide rail one and slide rail two, two adjusting rollers are moved when moving support frame moves, solve the problem that traditional roller is not adjustable, increase the time and workload of large-scale adjustment of the entire production line due to the replacement of vehicle models, greatly increase the equipment downtime, and greatly reduce the utilization rate and production efficiency of the production line.

[0004] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0005] The utility model discloses a kind of adjustable interval formula roller structures of automobile production line, including main frame mechanism, the main frame mechanism includes support base, the support base top is provided with support plate, the support plate top is provided with locking assembly, the support plate bottom is provided with adjusting assembly, the adjusting assembly includes support frame, the support frame top is fixedly connected with motor two, the support frame inside is provided with bevel gear one, the bevel gear one outer surface is meshed with bevel gear two and bevel gear three respectively, the bevel gear three front surface is fixedly connected with hollow shaft, the bevel gear two inside is fixedly connected with shaft two, the shaft two outer surface is rotatably connected with hollow shaft inside, the hollow shaft outer surface is fixedly connected with two support rods two, the front surface and back surface of the shaft two outer surface are fixedly connected with support rod one, the support plate bottom is provided with mobile support frame, the mobile support frame top is fixedly connected with two slide rails one and two slide rails two respectively.

[0006] Further, two of said slide rails two are respectively arranged on the sides away from each other of the two slide rails one, the left side and the right side of the top of the moving support frame are each provided with two sliding blocks, the bottom of the outer surface of the two sliding blocks on the right side is slidably connected with the inside of the slide rail one, the bottom of the outer surface of the two sliding blocks on the left side is slidably connected with the inside of the slide rail two, the inside of the two slide rails two on the left side is rotatably connected with a rotating rod, the front and back of the outer surface of the rotating rod is rotatably connected with the inside of the support rod one away from the rotating shaft two, the inside of the two sliding blocks on the right side is rotatably connected with the inside of the support rod two away from the hollow rotating shaft through a pin shaft.

[0007] Further, the front of the outer surface of the rotating shaft two is rotatably connected with the protrusion inside the bottom of the support plate, the back of the outer surface of the rotating shaft two is rotatably connected with the inside of the support frame, the front of the support frame is fixedly connected with the back of the support plate, the bottom output end of the motor two is fixedly connected with the inside of the bevel gear one through a shaft coupling.

[0008] Further, the left side and the right side of the inside of the moving support frame are each rotatably connected with an adjusting roller through a pin shaft, the inside of the four corners of the moving support frame is slidably connected with a support rod, the top of the four support rods is fixedly connected with the bottom of the four corners of the support plate, the bottom of the four support rods is fixedly connected with the left side and the right side of the front and the back of the support base, the left side and the right side of the inside of the support base is provided with a fixed roller, the inside of the two fixed rollers is fixedly connected with a rotating shaft one, the outer surface of the two rotating shaft ones is rotatably connected with the inside of the support base, the two rotating shaft ones penetrates through the support base and extends to the back, the left side of the front of the support base is fixedly connected with a motor one, the back output end of the motor one is fixedly connected with the front of the rotating shaft one on the left side through a shaft coupling, the back left side of the support base is provided with a belt pulley two, the inside of the belt pulley two is fixedly connected with the outer surface of the rotating shaft one on the left side, the outer surface of the belt pulley two is drivingly connected with a belt, the inside of the belt away from the belt pulley two is drivingly connected with a belt pulley one, the inside of the belt pulley one is fixedly connected with the outer surface of the rotating shaft one on the right side, the front of the top of the support plate is fixedly connected with a support frame.

[0009] Further, the top of the support frame is fixedly connected with an electric push rod, the back output end of the electric push rod is fixedly connected with a rack, the bottom of the rack is meshingly connected with a gear, the inside of the gear is fixedly connected with a bidirectional threaded rod, the left side and the right side of the top of the support base is fixedly connected with a fixed plate, the inside of the two fixed plates is rotatably connected with the left side and the right side of the outer surface of the bidirectional threaded rod, the left side and the right side of the bidirectional threaded rod penetrates through the fixed plate, the sides away from each other of the two fixed plates is provided with a moving bracket.

[0010] Further, the two mobile supports are internally threadedly connected with the left and right sides of the outer surface of the bidirectional threaded rod, the two mobile supports are fixedly connected with slide rods on the side close to the support plate, the outer surfaces of the two slide rods are slidably connected with the inner part of the fixed plate, the left and right sides of the support plate are fixedly connected with pointing frames, the inner parts of the two pointing frames are provided with scale plates, the bottom of the two scale plates is fixedly connected with the left and right sides of the mobile support frame, a plurality of limiting holes are formed in the inner part of the two scale plates, limiting rods are arranged on the front of the two slide rods, the side of the two limiting rods away from each other is fixedly connected with the corresponding side of the mobile support, and the side of the outer surface of the two limiting rods away from the mobile support is inserted into the inner part of the limiting hole.

[0011] The utility model has the following beneficial effects:

[0012] The utility model discloses a adjusting assembly is set up, specifically is the starting motor no.

[0013] The utility model discloses a locking assembly is set up, specifically is the starting electric push rod and drive gear wheel to rotate through the rack backward movement, gear wheel rotates the process and will pass through the two mobile supports of bidirectional threaded rod and each other close, the limit rod is moved when the mobile support moves, and the limit rod is inserted into the inner part of the limiting hole and is limited to the scale plate, avoids the movement of mobile support frame adjustment to complete after the situation, greatly promotes the stability of equipment processing, further improves the processing quality, and the staff can adjust according to the scale line on the surface of scale plate and the position of pointing frame, and the accuracy of adjustment is greatly improved.

[0014] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced to the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0016] Figure 1 It is the whole structure schematic diagram of the utility model.

[0017] Figure 2 It is the profile structure schematic view of the mobile support frame of the utility model;

[0018] Figure 3 It is the whole structure schematic view of the mobile support frame of the utility model;

[0019] Figure 4 It is the whole structure schematic view of the utility model Figure 3 It is the enlarged structure schematic view of A;

[0020] Figure 5 It is the whole structure schematic view of the utility model scale board;

[0021] Figure 6 It is the whole structure schematic view of the utility model Figure 5 It is the enlarged structure schematic view of B.

[0022] In the drawings, the component list represented by each sign is as follows:

[0023] 1, main frame mechanism;111, support base;112, motor one;113, fixed roller;114, support rod;115, support plate;116, belt pulley one;117, belt;118, belt pulley two;119, rotating shaft one;2, adjusting assembly;211, motor two;212, mobile support frame;213, adjusting roller;214, support frame;215, slide rail one;216, slide rail two;217, sliding block;218, rotating rod;219, support rod one;220, support rod two;221, rotating shaft two;222, hollow rotating shaft;223, bevel gear one;224, bevel gear two;225, bevel gear three;3, locking assembly;311, electric push rod;312, support frame;313, rack;314, gear;315, two-way threaded rod;316, mobile support;317, pointing frame;318, scale board;319, limiting hole;320, limiting rod;321, slide rod;322, fixed plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0025] Please refer to Figures 1-6The utility model discloses an adjustable spacing type roller structure of automobile production line, including main frame mechanism 1, and main frame mechanism 1 includes support base 111, is provided with support plate 115 at the top of support base 111, is provided with locking assembly 3 at the top of support plate 115, is provided with adjusting assembly 2 at the bottom of support plate 115, and adjusting assembly 2 includes support frame 214, is fixedly connected with motor two 211 at the top of support frame 214, is provided with bevel gear one 223 inside support frame 214, and the outer surface of bevel gear one 223 is connected with bevel gear two 224 and bevel gear three 225 respectively, and bevel gear three 225 is fixedly connected with hollow shaft 222 at the front, bevel gear two 224 is fixedly connected with shaft two 221 inside, and the outer surface of shaft two 221 is rotatably connected with the inside of hollow shaft 222, and the outer surface of hollow shaft 222 is fixedly connected with two support rods two 220, the front and back of the outer surface of shaft two 221 are fixedly connected with support rod one 219, and the bottom of support plate 115 is provided with mobile support frame 212, and the top of mobile support frame 212 is fixedly connected with two slide rails one 215 and two slide rails two 216 respectively, and the reverse rotation of bevel gear two 224 and bevel gear three 225 is driven by starting motor two 211, hollow shaft 222 and shaft two 221 will drive support rod two 220 and support rod one 219 to rotate at this time, and the movement of mobile support frame 212 will be driven by the sliding effect of four sliding blocks 217 in slide rail one 215 and slide rail two 216 at this time, and two adjusting rollers 213 will be driven to adjust when mobile support frame 212 moves, the time and work load of the whole production line needing large-scale adjustment due to the replacement of vehicle type are reduced, the equipment downtime is shortened, and the utilization and production efficiency of production line are improved.

[0026] Two slide rails two 216 are arranged at the sides away from each other of two slide rails one 215, and two sliding blocks 217 are arranged at the left side and the right side of the top of mobile support frame 212, the bottoms of the outer surfaces of the two sliding blocks 217 on the right side are slidably connected with the interiors of slide rails one 215, the bottoms of the outer surfaces of the two sliding blocks 217 on the left side are slidably connected with the interiors of slide rails two 216, a rotating rod 218 is rotatably connected in the interiors of the two slide rails two 216 on the left side, the front and back of the outer surface of rotating rod 218 are rotatably connected with the interiors of support rod one 219 away from shaft two 221, and the interiors of the two sliding blocks 217 on the right side are rotatably connected with the interiors of support rod two 220 away from hollow shaft 222.

[0027] The front of the outer surface of shaft two 221 is rotatably connected with the inside of the protrusion of the bottom of support plate 115, the back of the outer surface of shaft two 221 is rotatably connected with the interior of support frame 214, the front of support frame 214 is fixedly connected with the back of support plate 115, and the bottom output end of motor two 211 is fixedly connected with the interior of bevel gear one 223 through a shaft coupling.

[0028] The left side and the right side inside the mobile support frame 212 are rotatably connected with the adjusting rollers 213 through the pin shafts, the inside corners of the mobile support frame 212 are slidably connected with the support rods 114, the top of the four support rods 114 are fixedly connected with the bottom four corners of the support plate 115, the bottom of the four support rods 114 are fixedly connected with the left side and the right side of the front face and the back face of the support base 111, the left side and the right side inside the support base 111 are provided with the fixed rollers 113, the inside of the two fixed rollers 113 are fixedly connected with the shafts I 119, the outer surfaces of the two shafts I 119 are rotatably connected with the inside of the support base 111, the two shafts I 119 penetrate through the support base 111 and extend to the back face, the left side of the front face of the support base 111 is fixedly connected with the motor I 112, the back face output end of the motor I 112 is fixedly connected with the outer surface of the left shaft I 119 through the shaft coupling, the left side of the back face of the support base 111 is provided with the belt pulley II 118, the inside of the belt pulley II 118 is fixedly connected with the outer surface of the left shaft I 119, the outer surface of the belt pulley II 118 is drivingly connected with the belt 117, the inside of the belt 117 away from the belt pulley II 118 is drivingly connected with the belt pulley I 116, the inside of the belt pulley I 116 is fixedly connected with the outer surface of the right shaft I 119, the top of the front face of the support plate 115 is fixedly connected with the support frame 312.

[0029] The top of the support frame 312 is fixedly connected with an electric push rod 311, the back output end of the electric push rod 311 is fixedly connected with a rack 313, the bottom of the rack 313 is meshedly connected with a gear 314, the inside of the gear 314 is fixedly connected with a bidirectional screw rod 315, the left side and the right side of the top of the support base 111 are fixedly connected with fixed plates 322, the inside of the two fixed plates 322 are rotatably connected with the left side and the right side of the outer surface of the bidirectional screw rod 315, the left side and the right side of the bidirectional screw rod 315 penetrates through the fixed plates 322, the sides away from each other of the two fixed plates 322 are provided with movable supports 316, the inside of the two movable supports 316 are threadedly connected with the left side and the right side of the outer surface of the bidirectional screw rod 315, the sides close to the support plate 115 of the two movable supports 316 are fixedly connected with slide rods 321, the outer surfaces of the two slide rods 321 are slidably connected with the inside of the fixed plates 322, the left side and the right side of the support plate 115 are fixedly connected with pointing frames 317, the insides of the two pointing frames 317 are provided with scale plates 318, the bottoms of the two scale plates 318 are fixedly connected with the left side and the right side of the movable support frame 212, a plurality of limiting holes 319 are formed in the inside of the two scale plates 318, the front surfaces of the two slide rods 321 are provided with limiting rods 320, the sides away from each other of the two limiting rods 320 are fixedly connected with the corresponding sides of the movable supports 316, the sides away from the movable supports 316 of the outer surfaces of the two limiting rods 320 are inserted into the insides of the limiting holes 319, the rear movement of the electric push rod 311 drives the gear 314 to rotate through the rack 313, the two movable supports 316 are close to each other through the bidirectional screw rod 315 in the process of rotation of the gear 314, the limiting rods 320 are moved when the movable supports 316 are moved, and the limiting rods 320 are inserted into the limiting holes 319 to limit and fix the scale plates 318, so that the movement of the movable support frame 212 after adjustment is avoided, the stability during equipment processing is greatly improved, the processing quality is further improved, and the accuracy of adjustment is greatly improved according to the position of the scale line on the surface of the scale plate 318 and the pointing frame 317.

[0030] One specific application of this embodiment is: in use, when the device needs to be adjusted, start motor two 211 to drive bevel gear two 224 and bevel gear three 225 to reverse rotation, at the same time, the support frame 214 provides a certain support for the motor two 211 through the fixed connection with the support plate 115, when the bevel gear three 225 rotates, it will drive the hollow shaft 222 to rotate, when the hollow shaft 222 rotates, it will drive the two support rods two 220 to move, in the process of movement of the two support rods two 220, the two sliders 217 on the right will slide in the slide rail one 215, at the same time, when the bevel gear two 224 rotates, it will drive the shaft two 221 to rotate, in the process of rotation of the shaft two 221, the two support rods one 219 will move, in the process of movement of the two support rods one 219, the two sliders 217 on the left will slide in the slide rail two 216, at this time, the movement of the four sliders 217 through the slide rail one 215 and the slide rail two 216 will drive the moving support frame 212 to move, when the moving support frame 212 moves, it will drive the two adjusting rollers 213 to move, so as to adjust the distance between the adjusting roller 213 and the fixed roller 113, by adjusting the two adjusting rollers 213, the time and work amount of large-scale adjustment of the whole production line due to the change of vehicle model are reduced, the equipment downtime is shortened, and the utilization rate and production efficiency of the production line are improved, when the position adjustment of the adjusting roller 213 is completed, start the motor one 112 to drive the left shaft one 119 to rotate, when the shaft one 119 rotates, it will drive the belt pulley two 118 to rotate, when the belt pulley two 118 rotates, it will drive the belt pulley one 116 to rotate through the action of the belt 117, in the process of rotation of the belt pulley one 116, the fixed roller 113 will be driven to rotate through the action of the right shaft one 119, at this time, the rotation of the two fixed rollers 113 cooperates with the action of the adjusting roller 213 to complete the work requirement, at the same time, when the adjusting roller 213 is adjusted to the appropriate position, start the electric push rod 311 to drive the rack 313 to move backward, at the same time, the support frame 312 provides a certain support for the electric push rod 311 through the fixed connection with the support plate 115, when the rack 313 moves, it will drive the gear 314 to rotate, in the process of rotation of the gear 314, the bidirectional screw rod 315 will be driven to rotate, at this time, the fixed plate 322 provides a certain support for the bidirectional screw rod 315, when the bidirectional screw rod 315 rotates, it will drive the two movable supports 316 to approach each other, when the two movable supports 316 move, the slide rod 321 will slide in the fixed plate 322, the slide rod 321 provides a certain limitation for the movement track of the movable support 316 through the fixed plate 322, at the same time, when the movable support 316 moves, the limiting rod 320 will move, and the limiting rod 320 will be inserted into the limiting hole 319 to limit and fix the scale plate 318, avoid the movement of the moving support frame 212 after the adjustment is completed, greatly improve the stability of the equipment during processing, further improve the processing quality,At the same time, when the scale plate 318 is moved by the mobile support frame 212, the staff can adjust the position of the pointing frame 317 according to the scale line on the surface of the scale plate 318, thereby greatly improving the accuracy of the adjustment.

[0031] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments described. Obviously, according to the content of the present specification, many modifications and changes can be made. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that the persons skilled in the art can well understand and utilize the present application. The present application is limited by the claims and the entire scope and equivalents thereof.

Claims

1. An adjustable pitch roller structure for an automotive production line, characterized by: Including main frame mechanism (1), the main frame mechanism (1) includes support base (111), the support base (111) top is provided with support plate (115), the support plate (115) top is provided with locking assembly (3), the support plate (115) bottom is provided with adjusting assembly (2); The adjusting assembly (2) includes support frame (214), the support frame (214) top is fixedly connected with motor two (211), the support frame (214) is provided with bevel gear one (223) inside, the bevel gear one (223) outer surface is respectively meshed with bevel gear two (224) and bevel gear three (225), the bevel gear three (225) front surface is fixedly connected with hollow rotating shaft (222), the bevel gear two (224) inside is fixedly connected with rotating shaft two (221), the rotating shaft two (221) outer surface is rotatably connected with hollow rotating shaft (222) inside, the hollow rotating shaft (222) outer surface is fixedly connected with two support rods two (220), the rotating shaft two (221) outer surface's front surface and back surface are fixedly connected with support rod one (219), the support plate (115) bottom is provided with mobile support frame (212), the mobile support frame (212) top is fixedly connected with two slide rails one (215) and two slide rails two (216) respectively.

2. The adjustable pitch roller structure of an automobile production line according to claim 1, wherein Two slide rails two (216) are respectively arranged on the sides away from each other of two slide rails one (215), the left side and the right side of the mobile support frame (212) top are provided with two slide blocks (217), the bottom of the outer surface of two slide blocks (217) on the right side is slidably connected with the inside of slide rail one (215), the bottom of the outer surface of two slide blocks (217) on the left side is slidably connected with the inside of slide rail two (216), two slide rails two (216) on the left side are rotatably connected with rotating rod (218) inside, the front surface and the back surface of the outer surface of rotating rod (218) are rotatably connected with the inside of support rod one (219) away from rotating shaft two (221) side, the inside of two slide blocks (217) on the right side is rotatably connected with the inside of support rod two (220) away from hollow rotating shaft (222) side through pin shaft.

3. The adjustable pitch roller structure of an automobile production line according to claim 2, wherein The front surface of the outer surface of rotating shaft two (221) is rotatably connected with the inside of the protrusion of support plate (115), the back surface of the outer surface of rotating shaft two (221) is rotatably connected with the inside of support frame (214), the front surface of support frame (214) is fixedly connected with the back surface of support plate (115), the bottom output end of motor two (211) is fixedly connected with the inside of bevel gear one (223) through shaft coupling.

4. The adjustable pitch roller structure of an automobile production line according to claim 3, wherein The left side and the right side inside the mobile support frame (212) are rotatably connected with adjusting rollers (213) through pins, the inside of four corners of the mobile support frame (212) is slidably connected with support rods (114), the top of four support rods (114) is fixedly connected with the bottom four corners of the support plate (115), the bottom of four support rods (114) is fixedly connected with the left side and the right side of the front face and the back face of the support base (111), the left side and the right side inside the support base (111) is provided with fixed rollers (113), the inside of two fixed rollers (113) is fixedly connected with shafts I (119), the outer surface of two shafts I (119) is rotatably connected with the inside of the support base (111).

5. The adjustable pitch roller structure of an automobile production line according to claim 4, wherein Two shafts I (119) penetrate through the support base (111) and extend to the back face, the left side of the front face of the support base (111) is fixedly connected with motor I (112), the back face output end of the motor I (112) is fixedly connected with the front face of the left shaft I (119) through a shaft coupling, the back face left side of the support base (111) is provided with belt pulley II (118), the inside of the belt pulley II (118) is fixedly connected with the outer surface of the left shaft I (119), the outer surface of the belt pulley II (118) is drivingly connected with a belt (117), the inside of the belt (117) is drivingly connected with a belt pulley I (116) away from the belt pulley II (118) on one side, the inside of the belt pulley I (116) is fixedly connected with the outer surface of the right shaft I (119), the front face of the top of the support plate (115) is fixedly connected with a support frame (312).

6. The adjustable pitch roller structure of an automobile production line according to claim 5, wherein The top of the support frame (312) is fixedly connected with an electric push rod (311), the back face output end of the electric push rod (311) is fixedly connected with a rack (313), the bottom of the rack (313) is meshedly connected with a gear (314), the inside of the gear (314) is fixedly connected with a bidirectional screw rod (315), the left side and the right side of the top of the support base (111) are fixedly connected with fixed plates (322), the inside of two fixed plates (322) is rotatably connected with the left side and the right side of the outer surface of the bidirectional screw rod (315), the left side and the right side of the bidirectional screw rod (315) penetrates through the fixed plate (322), two fixed plates (322) are provided with mobile supports (316) away from each other on one side.

7. The adjustable pitch roller structure of an automobile production line according to claim 6, wherein Both said mobile supports (316) are internally threadedly connected with the left and right sides of the outer surface of the bidirectional threaded rod (315), both said mobile supports (316) are fixedly connected with slide rods (321) on the side close to the supporting plate (115), the outer surfaces of both said slide rods (321) are slidably connected with the inner part of the fixed plate (322), both sides of the supporting plate (115) are fixedly connected with pointing frames (317), both said pointing frames (317) are internally provided with scale plates (318), both said scale plates (318) are fixedly connected with the left and right sides of the mobile support frame (212), a plurality of limiting holes (319) are formed in the inner part of both said scale plates (318), limiting rods (320) are arranged on the front of both said slide rods (321), both sides of both said limiting rods (320) away from each other are fixedly connected with the corresponding sides of the mobile supports (316), and the outer surfaces of both said limiting rods (320) away from the mobile supports (316) are inserted into the inner part of the limiting holes (319).

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