CN210534585U - Secondary positioning device - Google Patents

Abstract

The utility model provides a secondary positioning device, the problem that the robot can't carry out the precision finishing because of the lower positioning accuracy of assembly table car has been solved, its technical scheme main points are that secondary positioning device includes first positioning mechanism, second positioning mechanism and third positioning mechanism, first positioning mechanism includes at least a pair of locating plate, second positioning mechanism includes at least a pair of supporting shoe and is used for driving the first driving piece that the supporting shoe goes up and down, third positioning mechanism includes the actuating mechanism that is used for driving the support foot to move to the preset position along the direction of extension of guide clearance; when the automated guided transporting vehicle moves to the stop position, the advancing direction of the automated guided transporting vehicle is limited through the positioning plate, and the height position and the front and back positions of the tray are respectively adjusted through the second positioning mechanism and the third positioning mechanism, so that the relative position of the tray and the robot is finally determined, the parts fixed on the tray and the robot cannot be dislocated, the processing precision is guaranteed, and the property loss caused by the fact that the robot is impacted is also avoided.

Description

Secondary positioning device

Technical Field

The utility model relates to an automatic guide transport vechicle location technical field especially relates to a secondary positioning device.

Background

A new energy electric vehicle battery production line is a production line which assembles components such as modules, wire harnesses, copper bars and boxes into an electric vehicle battery pack and tests air tightness, electrical performance and the like. With the rapid development of the new energy electric automobile industry, the power supply demand of electric automobiles is huge, and in order to improve the production efficiency, automatic guide transport vehicles are added in a plurality of workshops on a production line, wherein the automatic guide transport vehicles are transport vehicles which are equipped with automatic guide devices such as electromagnetism or optics and can run along a specified guide path. In production, an automatic guided transport vehicle is used for carrying an assembly trolley, a tray is placed on the assembly trolley, and the automatic guided transport vehicle runs to a specified position along a specified guide path and is matched with a process robot for operation. However, the existing automatic guided transporting vehicle is often inaccurate in positioning, and position deviation is easy to occur when the automatic guided transporting vehicle runs to a terminal point, so that the relative position of the assembly trolley and the robot is deviated, and processing cannot be normally performed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can improve assembly table car's positioning accuracy's secondary positioner.

In order to achieve the above object, a first aspect of the present invention provides a secondary positioning device, comprising a first positioning mechanism, a second positioning mechanism and a third positioning mechanism, the first positioning mechanism comprises at least one pair of positioning plates which are arranged oppositely and parallelly and jointly form a guide gap for limiting the advancing direction of the automatic guided transport vehicle, one end of the positioning plate is provided with a guide surface which is arranged at one side close to the guide gap and is used for guiding the automatic guided transport vehicle to enter the guide gap, the second positioning mechanism comprises at least one pair of supporting blocks for supporting the supporting feet of the assembly trolley tray carried on the automatic guide transport vehicle and a first driving piece for driving the supporting blocks to ascend and descend, the third positioning mechanism comprises a driving mechanism for driving the supporting foot to move to a preset position along the extending direction of the guide gap.

Through the scheme, when the automated guided transporting vehicle carries the assembly trolley and moves to the stop position, the advancing direction of the automated guided transporting vehicle is limited through the guide of the first positioning mechanism, the height position of the tray on the assembly trolley and the front and back positions of the guide direction along the first positioning mechanism are respectively adjusted through the second positioning mechanism and the third positioning mechanism, so that the relative position of the tray and the robot is finally determined, the dislocation between the fixed part on the tray and the robot can not occur, the processing precision is ensured, and the property loss caused by the collision of the robot is also avoided.

Further setting: a plurality of guide wheels are arranged on one side, close to the guide gap, of the positioning plate along the length direction of the positioning plate, and the guide wheels are rotatably connected to the positioning plate.

Through above-mentioned scheme, the leading wheel has reduced the resistance when automated guided transporting vehicle advances along the direction clearance, also can reduce the wearing and tearing of locating plate, improves positioning accuracy.

Further setting: the first driving piece is provided with a driving rod, and a floating joint which can be used for adjusting the initial height of the supporting block is arranged between the driving rod and the supporting block.

Through above-mentioned scheme, adjust the initial height that the joint can change the supporting shoe that floats to can change the jacking height of tray, with the operating position of better adaptation robot.

Further setting: a connecting plate is connected between the supporting block and the first driving piece, and the supporting block is connected to the connecting plate in a sliding manner along the extending direction of the guide gap.

Through the scheme, the supporting blocks can slide along the extending direction of the guide gaps, and when the supporting blocks support the tray, the supporting feet are driven to move to the preset position under the driving action of the driving mechanism, so that the effect of adjusting the front position and the rear position of the tray along the extending direction of the guide gaps is achieved.

Further setting: the driving mechanism comprises two push blocks which are respectively arranged on the front side and the rear side of the sliding direction of the supporting block and are used for independently pushing the supporting block to slide, and a second driving piece and a third driving piece which are respectively used for driving the two push blocks to move so as to push the supporting foot to move.

Through the scheme, under the combined action of the second driving piece and the third driving piece, the corresponding push blocks are driven from two opposite directions to push the supporting feet, so that the supporting feet move to the preset position, and the effect of positioning the supporting feet is realized.

Further setting: the connecting plate is provided with a limiting part for limiting the sliding stroke of the push block, and when the push block pushes the support foot to move to a preset position, the push block is abutted to the limiting part.

Through above-mentioned scheme, carry on spacingly with the help of the locating part to the ejector pad, when the ejector pad promotes the support foot and removes until ejector pad and locating part butt, support the foot promptly and reach preset position department, ensure to promote the position unanimity of support foot at every turn.

Further setting: the locating part including connect in the first connecting block on the connecting plate with connect in be used for on the first connecting block with the regulating part of ejector pad butt, set up the horizontal orientation on the first connecting block and can supply the regulation hole that the regulating part passed, the regulating part can be followed the direction of seting up of regulation hole is relative the first connecting block carries out position control.

Through the scheme, the adjusting piece can adjust the position along the adjusting hole, so that the limit of the stroke of the push block is changed, and the positioning position of the support foot can be flexibly adjusted during operation.

Further setting: the driving force of the second driving piece is larger than that of the third driving piece, when the pushing block pushes the supporting foot to move to a preset position, the limiting piece is only abutted against the pushing block connected with the second driving piece, and the supporting foot is clamped between the two pushing blocks.

Through the scheme, the driving force of the second driving piece is larger than that of the third driving piece, when the second driving piece and the third driving piece drive the corresponding push blocks to move simultaneously, the two push blocks move to form a clamping state on the supporting foot, and the push blocks connected with the second driving piece continue to push the supporting foot to advance until the supporting foot abuts against the limiting pieces.

Further setting: the supporting device is characterized in that a connecting rod is arranged between the supporting block and one of the pushing blocks, an avoiding hole is formed in the pushing block, the connecting rod penetrates through the avoiding hole and then is fixedly connected with the supporting block, a limiting part which can be abutted against one side, back to the supporting block, of the pushing block is arranged at one end, away from the supporting block, of the connecting rod, and an elastic part which is elastically pressed between the pushing block and the supporting block is sleeved on the connecting rod.

Through the scheme, the supporting blocks are used for supporting the supporting feet, when the positions of the supporting feet are adjusted, the positions of the supporting blocks are changed accordingly, when the second driving piece and the third driving piece drive the pushing block to reset, the supporting blocks automatically reset under the elastic action of the elastic pieces and move to the initial positions, so that the initial positions of the supporting blocks at each time are kept consistent, and the supporting areas of the supporting blocks for the supporting feet can be guaranteed.

Compared with the prior art, the utility model discloses a scheme has following advantage:

1. the utility model relates to an among the secondary positioner, carry on when the assembly platform truck removes to the parking position when the automated guided transporting vehicle, the advancing direction of automated guided transporting vehicle is injectd through the guide of first positioning mechanism, rethread second positioning mechanism and third positioning mechanism adjust respectively the high position of tray on the assembly platform truck and along the front and back position of first positioning mechanism's guide direction, thereby the relative position of final definite tray and robot, the dislocation can not take place for fixed part and robot on making the tray, guarantee the machining precision, also avoid the robot to receive the striking and the loss of property that brings.

2. The utility model relates to an among the secondary positioner, through setting up an at least a pair of locating plate, formed the guide clearance between two locating plates, when the automated guided transporting vehicle marchd to locating plate department, under the guide effect of the guide face of sub-A locating plate tip, enter into the guide clearance in, remove along the extending direction in guide clearance again, reached the effect that prevents the automated guided transporting vehicle emergence skew.

3. The utility model relates to an among the secondary positioner, order about the supporting shoe through first driving piece and rise and hold up the tray to predetermineeing the height to the location to tray direction of height has been realized.

4. The utility model relates to an among the secondary positioner, promote the support foot from the ejector pad that two opposite direction drives correspond with the help of second driving piece and third driving piece and remove to the promotion stroke of restriction ejector pad under the effect of locating part, thereby realize the location along guide gap extending direction to the support foot.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic view of an application structure of an embodiment of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

fig. 4 is a schematic structural diagram of a second positioning mechanism and a third positioning mechanism according to an embodiment of the present invention;

fig. 5 is an enlarged schematic view of B in fig. 4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the utility model relates to a secondary positioning device 1, it includes first positioning mechanism 11, second positioning mechanism 12 and third positioning mechanism 13, first positioning mechanism 11 is used for injecing the advancing direction of automated guided transporting vehicle 2 and guides it to the parking position, second positioning mechanism 12 is used for adjusting the height position of assembly platform truck 3 tray 31 that carries on automated guided transporting vehicle 2 after automated guided transporting vehicle 2 parks, third positioning mechanism 13 is used for adjusting after accomplishing to tray 31 height position adjustment tray 31 follows the relative position of the guiding direction of first positioning mechanism 11.

When the automated guided transporting vehicle 2 carries the assembly trolley 3 and moves to the stop position, the advancing direction of the automated guided transporting vehicle 2 is limited by the guide of the first positioning mechanism 11, the height position of the tray 31 on the assembly trolley 3 and the front and back positions along the guide direction of the first positioning mechanism 11 are respectively adjusted by the second positioning mechanism 12 and the third positioning mechanism 13, so that the relative position of the tray 31 and the robot is finally determined, the parts fixed on the tray 31 and the robot cannot be dislocated, the processing precision is guaranteed, and the property loss caused by the fact that the robot is impacted by the assembly trolley 3 is avoided.

Preferably, the first positioning mechanism 11 includes at least one pair of positioning plates 111 disposed in parallel and collectively forming a guide gap for defining a traveling direction of the automated guided vehicle 2, and one end of the positioning plate 111 is provided with a guide surface 1111 at a side close to the guide gap, the guide surface 1111 being an inclined surface having an angle with the guide direction. In this embodiment, the first positioning mechanism 11 further includes a supporting seat 112, two positioning plates 111 are provided, and the positioning plates 111 are mounted on the supporting seat 112. In other embodiments, the positioning plates 111 may be further provided in a plurality of pairs at intervals along the extending direction of the guide gap. In other embodiments, the first positioning mechanism 11 may also be a guide rail laid on the ground, and the travel direction of the automated guided vehicle 2 is defined by the guiding function of the guide rail.

Preferably, a plurality of guide wheels 113 are arranged on one side of the positioning plate 111 close to the guide gap along the length direction thereof, and the guide wheels 113 are rotatably connected to the positioning plate 111. Specifically, the guide wheel 113 is mounted on the edge of the upper surface of the positioning plate 111 and is used for abutting against the assembly trolley 3, and in other embodiments, the guide wheel 113 may be embedded in the side wall of the positioning plate 111.

With the guide gap formed between the two positioning plates 111 and the guide wheels 113 provided on the positioning plates 111, when the automated guided vehicle 2 reaches the positioning plate 111, the side wall of the assembly carriage 3 first abuts against the guide wheels 113 on the guide surface 1111 of the end portion of the positioning plate 111, enters the guide gap under the action of the guide surface 1111, and travels along the guide gap until stopping, thereby preventing the travel route of the assembly carriage 3 from deviating.

As shown in fig. 4, preferably, the second positioning mechanism 12 includes at least one pair of supporting blocks 121 for supporting the supporting legs 311 of the tray 31 of the assembly trolley 3, and a first driving member for driving the supporting blocks 121 to move up and down, in this embodiment, the supporting blocks 121 are provided with four supporting legs 311 for respectively supporting the tray 31 in a one-to-one correspondence manner, and the first driving member is a first air cylinder 122. In other embodiments, the first driving member may further include a motor, and a rack and pinion engagement structure is disposed between the motor and the supporting block 121, and the motor drives the gear to rotate so as to lift the supporting block 121. The supporting block 121 is driven to ascend by the first driving member, and the supporting block 121 supports the tray 31 to a preset height position, so that the tray 31 is positioned in height.

Preferably, a floating joint 123 for adjusting the initial height of the supporting block 121 is disposed between the driving rod of the first cylinder 122 and the supporting block 121.

Further, a connecting plate 124 is connected between the supporting block 121 and the first cylinder 122, a sliding plate 125 is extended downward from one side of the connecting plate 124, the second positioning mechanism 12 further includes a bottom plate 126, the first cylinder 122 is fixed on the bottom plate 126, an auxiliary frame 127 is further disposed on the bottom plate 126, a sliding rail 1271 is vertically disposed on the auxiliary frame 127, and the sliding plate 125 is connected with the sliding rail 1271 and is in sliding fit with the sliding rail 1271.

Through the auxiliary frame 127 with the slide rail 1271, the slide rail 1271 can provide vertical guide effect for the connecting plate 124 when the first cylinder 122 is jacking the tray 31, so that the first cylinder 122 is more stable in the jacking process.

As shown in fig. 3 to 5, preferably, the supporting block 121 is slidably connected to the connecting plate 124 along the extending direction of the guide gap, and the third positioning mechanism 13 includes a driving mechanism capable of driving the supporting foot 311 to move to a predetermined position along the extending direction of the guide gap.

Preferably, the driving mechanism includes two pushing blocks 131 respectively disposed at the front and rear sides of the sliding direction of the supporting block 121 and used for independently pushing the supporting block 121 to slide, and a second driving element and a third driving element respectively used for driving the two pushing blocks 131 to move so as to push the supporting foot 311 to move. In this embodiment, the pushing block 131 is slidably connected to the connecting plate 124, the second driving member and the third driving member are respectively a second air cylinder 132 and a third air cylinder 133, and in this embodiment, two second air cylinders 132 and two third air cylinders 133 are respectively provided, and two second air cylinders 132 can be respectively provided on any two connecting plates 124. In other embodiments, only one or more than two second cylinders 132 and three third cylinders 133 may be provided, and the second cylinders 132 and the third cylinders 133 correspond to each other one by one.

After the supporting block 121 is driven by the first cylinder 122 to rise and jack up the tray 31, the supporting leg 311 on the tray 31 abuts against the supporting block 121, and the second cylinder 132 and the third cylinder 133 drive the pushing block 131 correspondingly connected with the two cylinders to move in opposite directions so as to push the supporting leg 311 to move to a preset position, so that the positions of the supporting leg 311 are kept consistent every time, the positioning accuracy of the tray 31 on the assembly trolley 3 is improved, and the machining accuracy is improved.

Preferably, the connecting plate 124 is provided with a limiting member 134 for limiting a sliding stroke of the pushing block 131, and when the pushing block 131 pushes the supporting leg 311 to move to a preset position, the pushing block 131 abuts against the limiting member 134. It should be noted that, since the four supporting legs 311 on the tray 31 are linked, only one of the supporting legs 311 needs to be positioned to complete the positioning of the other three supporting legs 311, and thus, a plurality of limiting members 134 may be provided, or only one of the limiting members may be provided.

The stopper 134 is used to limit the push block 131, and when the push block 131 pushes the supporting leg 311 to move until the push block 131 abuts against the stopper 134, that is, the supporting leg 311 reaches a preset position, it is ensured that the positions of the supporting leg 311 pushed each time are consistent.

In this embodiment, the limiting member 134 includes a first connecting block 1341 connected to the connecting plate 124 and an adjusting member 1342 connected to the first connecting block 1341 and used for abutting against the pushing block 131, an adjusting hole 13411 is formed in the first connecting block 1341, the adjusting member 1342 extends horizontally and can allow the adjusting member 1342 to pass through, and the adjusting member 1342 can perform position adjustment relative to the first connecting block 1341 along the opening direction of the adjusting hole 13411. Specifically, the adjusting member 1342 may be a screw, and the fixing of the adjusting member 1342 and the adjusting hole 13411 may be achieved by a nut. By changing the relative position of the adjusting piece 1342 and the first connecting block 1341, the stroke limit of the pushing block 131 is changed, i.e. the positioning position of the supporting foot 311 can be changed, and the applicability of the device is improved.

Further, the connecting plate 124 is further provided with a buffer member 135 for buffering the contact between the pushing block 131 and the limiting member 134. In this embodiment, the buffer member 135 includes the oil pressure limiting ejector pin 1351, when the needle of the head of the oil pressure limiting ejector pin 1351 receives pressure, the needle displaces and compresses oil inside the oil pressure limiting ejector pin 1351, and the oil pressure is used as a buffer to provide a buffer effect for the push block 131, thereby preventing the push block 131 from causing large impact when abutting against the limiting member 134. In other embodiments, the buffer 135 may also be a spring or other elastically deformable object.

Preferably, the buffer member 135 further includes a second connecting block 1352 connected to the connecting plate 124, a mounting hole 13521 is formed in the second connecting block 1352 for the oil pressure limiting thimble 1351 to pass through, and the oil pressure limiting thimble 1351 is adjustable along the mounting hole 13521 to adjust a position relative to the second connecting block 1352. Specifically, the outer wall of the oil pressure limiting thimble 1351 is sleeved with a nut, and the oil pressure limiting thimble 1351 is fixedly connected with the second connecting block 1352 by means of the screw-thread matching action of the nut and the oil pressure limiting thimble 1351.

Preferably, the driving force of the second driving element is greater than the driving force of the third driving element, when the pushing block 131 pushes the supporting leg 311 to move to the preset position, the limiting element 134 is only abutted to the pushing block 131 connected to the second driving element, and the supporting leg 311 is clamped between the two pushing blocks 131.

Through the scheme, because the driving force of the second driving element is greater than that of the third driving element, when the second driving element and the third driving element drive the corresponding push blocks 131 to move simultaneously, the two push blocks 131 move oppositely and form a clamping state on the supporting foot 311, and the push blocks 131 connected with the second driving element continue to push the supporting foot 311 to advance until the push blocks 131 abut against the limiting pieces 134, by adopting the structure, the limiting of the two push blocks 131 on the position of the supporting foot 311 can be realized without arranging two groups of limiting pieces 134 on the same connecting plate 124, parts are saved, and the structure is simplified.

Further, a connecting rod 136 is arranged between the supporting block 121 and one of the pushing blocks 131, an avoiding hole 1311 is formed in the pushing block 131, the connecting rod 136 penetrates through the avoiding hole 1311 and then is fixedly connected with the supporting block 121, a limiting portion 1361 which can be abutted to one side of the pushing block 131, which faces away from the supporting block 121, is arranged at one end, away from the supporting block 121, of the connecting rod 136, an elastic member 137 is sleeved on the connecting rod 136 and is elastically pressed between the pushing block 131 and the supporting block 121, and the elastic member 137 is a spring.

Because the supporting block 121 is used for supporting the supporting leg 311, when the position of the supporting leg 311 is adjusted, the position of the supporting block 121 is changed accordingly, and when the second driving element and the third driving element drive the pushing block 131 to reset, the supporting block 121 automatically resets under the elastic action of the elastic element 137 and moves to the initial position, so that the initial position of the supporting block 121 is kept consistent every time, and the supporting area of the supporting block 121 for the supporting leg 311 can be ensured.

Preferably, a threaded groove is formed on the supporting block 121, and an end of the connecting rod 136 is threadedly engaged with the threaded groove. Due to the fact that the end of the connecting rod 136 is matched with the threads of the thread groove in the supporting block 121, the relative positions of the supporting block 121 and the pushing block 131 can be changed as required, and different supporting requirements can be met.

The utility model relates to a secondary positioner 1's concrete location process as follows:

the automated guided vehicle 2 carries the assembly carriage 3 and moves to the positioning plate 111 under the guidance of the automated guide device, first enters the guide gap under the guidance of the guide surface 1111 on the positioning plate 111, and the automated guided vehicle 2 continues to move forward until it stops under the guidance of the automated guide device. After the automatic guided vehicle 2 is stopped, the supporting foot 311 on the tray 31 is located above the supporting block 121, the supporting foot 311 is jacked up after the supporting block 121 is driven to ascend by the aid of the first air cylinder 122, the tray 31 is stopped after being lifted to a specified height, the second air cylinder 132 and the third air cylinder 133 start to work, the second air cylinder 132 and the third air cylinder 133 drive the pushing block 131 to be close to the supporting foot 311 respectively, the supporting foot 311 is pushed to move until the pushing block 131 connected with the second air cylinder 132 abuts against the adjusting piece 1342, the supporting foot 311 is clamped between the two pushing blocks 131 at the moment, the final positioning of the tray 31 is achieved, the fixing of the tray 31 is achieved, and finally the robot and the tray 31 are started to perform assembling work.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A secondary positioning device is characterized in that: including first positioning mechanism, second positioning mechanism and third positioning mechanism, first positioning mechanism includes that at least a pair of relative parallel arrangement and common formation are used for prescribing a limit to the locating plate in the direction of travel of automated guided transport vechicle guide clearance, the one end of locating plate is equipped with the guide face, the guide face is established and is close to one side in guide clearance is used for the guide automated guided transport vechicle gets into guide clearance, second positioning mechanism includes that at least a pair of supporting shoe that is used for supporting the assembly table car tray of carrying on the automated guided transport vechicle and is used for the drive the first driving piece that the supporting shoe goes up and down, third positioning mechanism is including being used for driving about the support foot is followed guide clearance extending direction removes to the actuating mechanism of preset position.

2. The secondary positioning device of claim 1, wherein: a plurality of guide wheels are arranged on one side, close to the guide gap, of the positioning plate along the length direction of the positioning plate, and the guide wheels are rotatably connected to the positioning plate.

3. The secondary positioning device of claim 1, wherein: the first driving piece is provided with a driving rod, and a floating joint which can be used for adjusting the initial height of the supporting block is arranged between the driving rod and the supporting block.

4. The secondary positioning device of claim 1, wherein: a connecting plate is connected between the supporting block and the first driving piece, and the supporting block is connected to the connecting plate in a sliding manner along the extending direction of the guide gap.

5. The secondary positioning device of claim 4, wherein: the driving mechanism comprises two push blocks which are respectively arranged on the front side and the rear side of the sliding direction of the supporting block and are used for independently pushing the supporting block to slide, and a second driving piece and a third driving piece which are respectively used for driving the two push blocks to move so as to push the supporting foot to move.

6. The secondary positioning device of claim 5, wherein: the connecting plate is provided with a limiting part for limiting the sliding stroke of the push block, and when the push block pushes the support foot to move to a preset position, the push block is abutted to the limiting part.

7. The secondary positioning device of claim 6, wherein: the locating part including connect in the first connecting block on the connecting plate with connect in be used for on the first connecting block with the regulating part of ejector pad butt, set up the horizontal orientation on the first connecting block and can supply the regulation hole that the regulating part passed, the regulating part can be followed the direction of seting up of regulation hole is relative the first connecting block carries out position control.

8. The secondary positioning device of claim 6, wherein: the driving force of the second driving piece is larger than that of the third driving piece, when the pushing block pushes the supporting foot to move to a preset position, the limiting piece is only abutted against the pushing block connected with the second driving piece, and the supporting foot is clamped between the two pushing blocks.

9. The secondary positioning device of claim 5, wherein: the supporting device is characterized in that a connecting rod is arranged between the supporting block and one of the pushing blocks, an avoiding hole is formed in the pushing block, the connecting rod penetrates through the avoiding hole and then is fixedly connected with the supporting block, a limiting part which can be abutted against one side, back to the supporting block, of the pushing block is arranged at one end, away from the supporting block, of the connecting rod, and an elastic part which is elastically pressed between the pushing block and the supporting block is sleeved on the connecting rod.

Images