Automatic conveying and weighing machine

Abstract

The invention relates to the field of conveying and weighing, in particular to an automatic conveying and weighing machine which comprises a mounting frame body, a temporary supporting assembly, a quick connecting assembly and a turnover connecting assembly, a conveying support is horizontally arranged above the mounting frame body, two supporting base plates are symmetrically arranged at the lower end of the conveying support, and an upper bearing plate is horizontally and jointly arranged in the centers of the lower ends of the two supporting base plates; the single-point weighing sensing module is arranged between the mounting frame body and the conveying support to replace a structure of four weighing modules, the problem of weighing angle difference of the four weighing modules is avoided, and then the single-point weighing sensing module is arranged between the mounting frame body and the conveying support through the overturning connecting assembly and the quick connecting assembly. The single-point weighing sensing module can be stably and quickly connected and assembled with the mounting frame body and the conveying bracket, and when the single-point weighing sensing module goes wrong and needs to be replaced and maintained, the temporary supporting assembly is matched to temporarily and stably support the conveying bracket, so that the single-point weighing sensing module can be quickly detached and replaced, and the working efficiency of the single-point weighing sensing module is improved. And the problem that the production efficiency is influenced due to long-time shutdown of the production line is avoided.

Description

Technical Field

[0001] The invention relates to the field of conveying and weighing, in particular to an automatic conveying and weighing machine. Background Art

[0002] Automatic conveying and weighing equipment is a device that automatically weighs materials during the material conveying process. It mainly includes a conveying mechanism and a weighing mechanism. The conveying mechanism is installed above the weighing mechanism, and the material weighing process can be completed when the material is conveyed. The weighing sensor modules used in the conveying weighing equipment in the prior art are mostly four-legged support detection methods. During the detection, the material is moved to the center of the conveying mechanism, and the material's own weight is obtained through the measurement values ​​of the four weighing sensor modules. However, the four-legged installation of the weighing sensor modules may cause angular differences between the four corners after long-term weighing use, which is time-consuming and labor-intensive to adjust. In addition, when one or more of the weighing sensor modules are damaged and need to be replaced, the upper conveying mechanism needs to be disassembled and replaced for maintenance, which affects processing and production. Summary of the invention

[0003] The object of the present invention is to provide an automatic conveying weighing machine to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: an automatic conveying weighing machine, comprising: An installation frame, wherein a conveying bracket is horizontally arranged above the installation frame, two supporting pads are symmetrically arranged at the lower end of the conveying bracket, an upper load-bearing plate is horizontally arranged at the center of the lower ends of the two supporting pads, and a load-bearing beam seat is horizontally fixedly arranged on the installation frame directly below the upper load-bearing plate, and a single-point weighing sensor module is installed between the upper load-bearing plate and the load-bearing beam seat through a quick-connect assembly and a flip connection assembly; The flip connection assembly includes a load-bearing support rod and a flip seat plate. An embedded combination groove is provided through one side of the load-bearing beam seat. The load-bearing support rod is horizontally arranged on one side of the embedded combination groove. One side of the flip seat plate is movably sleeved with the load-bearing support rod. The quick-connect assembly includes two assembly connection ears. A temporary support assembly is provided between the mounting frame and the support pad, and the temporary support assembly comprises four lifting cylinders, four temporary support rods and four docking seats.

[0005] Preferably, a removal slot is provided on one side of the embedded combined slot through the load-bearing beam seat, one side of the load-bearing support rod is inserted into the center of the removal slot, and the thickness of the flip seat plate is smaller than the width of the removal slot.

[0006] Preferably, a first side-mounted support plate is vertically provided on one side of the upper end of the flip seat plate, the single-point weighing sensor module is horizontally provided on one side of the first side-mounted support plate by bolts, and a second side-mounted support plate is fixedly provided on the side of the single-point weighing sensor module away from the first side-mounted support plate by bolts, a quick-connect plate is horizontally provided on the upper end of the second side-mounted support plate, and two assembly connecting ears are symmetrically provided on one side of the upper load-bearing plate close to the quick-connect plate, the quick-connect plate of the second side-mounted support plate is plugged into the two assembly connecting ears, both assembly connecting ears are horizontally penetrated by threads and plugged with a first fixing screw, and the first fixing screw penetrates and is plugged into the quick-connect plate of the second side-mounted support plate.

[0007] Preferably, the load-bearing beam seat is located on a side of the embedded combination groove and away from the load-bearing support rod and is provided with two second fixing screws inserted horizontally through threads. When the flip seat plate is horizontally placed in the embedded combination groove, the two second fixing screws are respectively inserted through the flip seat plate.

[0008] Preferably, a lap groove is provided at the lower end of the load-bearing beam seat near the removal slot, and a flip positioning box is horizontally provided on one side of the lap groove of the flip seat plate, and the flip positioning box is horizontally inserted into the lap groove.

[0009] Preferably, a telescopic slot is horizontally opened in the flip positioning box, an auxiliary support rod is horizontally movably inserted in the telescopic slot, a support slot is horizontally penetrated through one side of the load-bearing support rod located in the removal slot, and one side of the auxiliary support rod movably penetrates the flip positioning box and one side of the removal slot and is inserted into the support slot.

[0010] Preferably, a strip groove is provided in the telescopic groove and passes through the flip positioning box, a push-pull rod is provided on one side of the auxiliary support rod located in the telescopic groove, the push-pull rod movably passes through the plug-in strip groove, a retaining spring is horizontally provided on the side of the telescopic groove away from the load-bearing support rod, and one side of the auxiliary support rod is in contact with the retaining spring.

[0011] Preferably, the four docking seats are symmetrically arranged in pairs at the lower ends of the two supporting pads, and the upper end of the mounting frame directly below the docking seat is horizontally provided with an assembly pad, and the four jacking cylinders are vertically arranged at the upper end centers of the four assembly pads.

[0012] Preferably, the lower ends of the four temporary support rods are respectively vertically movably plugged into the upper end of the jacking cylinder, and a lifting piston is sleeved on one side of the temporary support rod inserted into the jacking cylinder. A limiting ring is horizontally provided at the lower end of the jacking cylinder, and the jacking cylinder is horizontally connected to the lower end of the limiting ring with an air joint.

[0013] Preferably, a conical mating groove is provided at the lower end of the docking seat, and the upper end of the temporary support rod is vertically inserted into the conical mating groove. The upper end of the temporary support rod inserted into the conical mating groove is provided with a conical surface, and when the temporary support rod is lifted to the maximum extent, the vertical height of the upper load-bearing plate from the flip seat plate is equal to the vertical height of the upper end of the second side support plate from the flip seat plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: A single-point weighing sensor module is set between the mounting frame and the conveying bracket to replace the structure of the four weighing modules, thereby avoiding the problem of weighing angle difference among the four weighing modules. Then, by flipping the connecting assembly and the quick-connect assembly, the single-point weighing sensor module can be stably and quickly connected and assembled with the mounting frame and the conveying bracket. When a problem occurs with the single-point weighing sensor module and it needs to be replaced and maintained, the temporary support assembly can be used to provide temporary and stable support for the conveying bracket, so that the single-point weighing sensor module can be quickly disassembled and replaced, thereby avoiding long-term shutdown of the production line and affecting production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from a first viewing angle; Figure 2 For the present invention Figure 1 Schematic diagram of part A; Figure 3 A schematic diagram of the second viewing angle of the three-dimensional structure of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of part B; Figure 5 It is a schematic diagram of the local episiotomy structure of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the C part; Figure 7 It is a schematic diagram of the installation structure of the load-bearing beam seat 5 and the installation frame 1 of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the D part; Fig. 9 This is an exploded view of the connection of the single-point weighing sensor module 11 of the present invention; Fig.10 It is a schematic diagram of the connection side of the temporary support assembly of the present invention; Fig.11 For the present invention Fig.10 Schematic diagram of part E.

[0016] In the figure: installation frame 1, conveying bracket 2, support pad 3, upper load-bearing plate 4, load-bearing beam seat 5, embedded combination groove 6, removal groove 7, load-bearing support rod 8, flip seat plate 9, first side support plate 10, single-point weighing sensor module 11, second side support plate 12, assembly connecting ear 13, first fixing screw 14, second fixing screw 15, lap groove 16, flip positioning box 17, telescopic groove 19, auxiliary support rod 20, retaining spring 21, push-pull rod 22, assembly pad 23, lifting cylinder 24, docking seat 25, conical matching groove 26, temporary support rod 27, lifting piston 28, support groove 29. DETAILED DESCRIPTION

[0017] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 11 , the present invention provides the following technical solutions: Embodiment 1: An automatic conveyor weighing machine comprises a mounting frame 1, a conveyor bracket 2 is horizontally arranged above the mounting frame 1, two support pads 3 are symmetrically arranged at the lower end of the conveyor bracket 2, and an upper load-bearing plate 4 is horizontally arranged at the lower center of the two support pads 3. A load-bearing beam seat 5 is horizontally fixedly arranged directly below the upper load-bearing plate 4 on the mounting frame 1, and a single-point weighing sensor module 11 is installed between the upper load-bearing plate 4 and the load-bearing beam seat 5 through a quick-connect assembly and a flip connection assembly. A single-point weighing sensor module 11 is arranged between the lower center of the conveyor bracket 2 and the upper center of the mounting frame 1. The sensing module 11 replaces the traditional four weighing modules to avoid the problem of weighing angle difference and the difficulty of later maintenance. An electric control operation box is vertically provided on one side of the mounting frame 1. The conveying of the conveying bracket 2 and the detection and summary of the weighing data of the single-point weighing sensor module 11 are performed through the electric control operation box. In order to improve the accuracy of weighing objects, a position sensor can be set on the side of the center of the conveying bracket 2 on the mounting frame 1. When the material moves to the center of the conveying bracket 2, the weighing value of the single-point weighing sensor module 11 is obtained in time.

[0019] The flip connection assembly includes a load-bearing support rod 8 and a flip seat plate 9. An embedded combination groove 6 is penetrated on one side of the load-bearing beam seat 5. The load-bearing support rod 8 is horizontally arranged on one side of the embedded combination groove 6. One side of the flip seat plate 9 is movably sleeved with the load-bearing support rod 8. The quick-connect assembly includes two assembly connection ears 13. A removal slot 7 is penetrated on one side of the embedded combination slot 6 and penetrates the load-bearing beam seat 5. One side of the load-bearing support rod 8 is plugged into the center of the removal slot 7. The thickness of the flip seat plate 9 is less than the width of the removal slot 7. The single-point weighing sensor module 11 is supported and connected to the load-bearing beam seat 5 through the flip seat plate 9. When the single-point weighing sensor module 11 needs to be replaced, the flip seat plate 9 can be rotated to a vertical posture, and then the flip seat plate 9 can be horizontally pulled out from the position of the removal slot 7 to separate the flip seat plate 9 from the load-bearing support rod 8. A flip seat plate 9 with a new single-point weighing sensor module 11 can be directly replaced for installation. The operation is simple and convenient. The load-bearing support rod 8 is a high-strength steel structure, and the first side support plate 10 is arranged on the flip seat plate 9 near the load-bearing support rod 8. After the flip seat plate 9 is connected to the load-bearing support rod 8, the downward pressure generated by the conveying bracket 2 and the cargo is mainly supported by the load-bearing support rod 8.

[0020] A first side mounting support plate 10 is vertically provided on one side of the upper end of the flip seat plate 9, a single-point weighing sensor module 11 is horizontally provided on one side of the first side mounting support plate 10 by bolts, a second side mounting support plate 12 is fixedly provided on the side of the single-point weighing sensor module 11 away from the first side mounting support plate 10 by bolts, a quick-connect plate is horizontally provided on the upper end of the second side mounting support plate 12, two assembly connection ears 13 are symmetrically provided on one side of the upper load-bearing plate 4 close to the quick-connect plate, the quick-connect plate of the second side mounting support plate 12 is plugged into the two assembly connection ears 13, both assembly connection ears 13 are horizontally penetrated and plugged with a first fixing screw 14 through a thread, and the first fixing screw 14 penetrates and plugs into the second The quick-connect plate of the side-mounted support plate 12, the load-bearing beam seat 5 is located at the side of the embedded combination groove 6 and away from the load-bearing support rod 8, and two second fixing screws 15 are inserted and inserted horizontally through the thread. When the flip seat plate 9 is horizontally placed in the embedded combination groove 6, the two second fixing screws 15 penetrate and insert the flip seat plate 9 respectively. When the flip seat plate 9 is horizontally inserted in the embedded combination groove 6, the quick-connect plate of the second side-mounted support plate 12 contacts the lower end of the upper load-bearing plate 4, and the quick-connect plate is adapted to the assembly connection ear 13 and is provided with a first fixing hole. The first fixing screw 14 can penetrate the first fixing hole horizontally to support and connect the single-point weighing sensor module 11 with the upper conveying bracket 2; After the single-point weighing sensor module 11 is connected and fixed to the upper load-bearing plate 4, in order to ensure the stable support of the flip seat plate 9, two second fixing screws 15 are threadedly inserted in the embedded combination groove 6 and one side of the flip seat plate 9 to maintain the horizontal posture of the flip seat plate 9 and share the load-bearing force of the load-bearing support rod 8.

[0021] A lap groove 16 is provided at the lower end of the side of the load-bearing beam seat 5 close to the removal slot 7, a flip seat plate 9 is horizontally provided with a flip positioning box 17 on one side of the lap groove 16, and the flip positioning box 17 is horizontally inserted into the lap groove 16, a telescopic groove 19 is horizontally provided in the flip positioning box 17, and an auxiliary support rod 20 is horizontally inserted in the telescopic groove 19, and a support groove 29 is horizontally penetrated through the side of the load-bearing support rod 8 located in the removal slot 7, and one side of the auxiliary support rod 20 is movably penetrated through the flip positioning box 17 and one side of the removal slot 7 and inserted into the support groove 29, and a strip groove is provided in the telescopic groove 19 through the flip positioning box 17, and the auxiliary support rod 20 is provided on one side of the telescopic groove 19 There is a push-pull rod 22, which is movable through the plug-in strip groove. A retaining spring 21 is horizontally provided on the side of the telescopic groove 19 away from the load-bearing support rod 8, and one side of the auxiliary support rod 20 is in contact with the retaining spring 21. Since one side of the load-bearing support rod 8 and the side of the load-bearing beam seat 5 located on the removal groove 7 are both cantilever structures, in order to improve the stability of the flip seat plate 9 when it is used as a base support, an auxiliary support rod 20 with telescopic control is set. When the auxiliary support rod 20 passes through the flip positioning box 17 and the load-bearing support rod 8 and is plugged into the load-bearing beam seat 5 on the other side, the auxiliary support rod 20 serves as an auxiliary supporting structure to stably support one side of the cantilever structure of the load-bearing support rod 8 and the load-bearing beam seat 5.

[0022] In this embodiment, when the single-point weighing sensor module 11 is damaged and needs to be replaced, the machine is stopped for a short time, and the first fixing screw 14 and the second fixing screw 15 are disassembled sideways by a wrench. After the first fixing screw 14 and the second fixing screw 15 are disassembled, the push-pull rod 22 is pushed and pulled horizontally to disengage the auxiliary support rod 20 from the load-bearing support rod 8 and squeeze the retaining spring 21 to retract into the telescopic groove 19, and the flip seat plate 9 is rotated along the load-bearing support rod 8 to make the flip seat plate 9 in a vertical posture. At this time, the second side support plate 12 and the single-point weighing sensor module 11 are flipped out and embedded in the combination groove 6, and are located under the load-bearing beam seat 5. The flip seat plate 9 with the single-point weighing sensor module 11 is horizontally pulled out along the removal slot 7 and the load-bearing support rod 8, and the flip seat plate 9 with a new single-point weighing sensor module 11 is replaced for assembly, thereby reducing long-term shutdown maintenance in the production process and improving production efficiency.

[0023] Embodiment 2: On the basis of embodiment 1, a temporary support assembly is provided to maintain the position height and horizontal posture of the conveying bracket 2 when the single-point weighing sensor module 11 is replaced. The temporary support assembly is arranged between the mounting frame 1 and the supporting pad 3. The temporary support assembly includes four lifting cylinders 24, four temporary support rods 27 and four docking seats 25. The four docking seats 25 are symmetrically arranged at the lower ends of the two supporting pads 3 in pairs. The upper end of the mounting frame 1 directly below the docking seats 25 is horizontally provided with an assembly pad 23. The four lifting cylinders 24 are respectively vertically arranged at the upper end center of the four assembly pads 23. The lower ends of the four temporary support rods 27 are respectively vertically movably plugged into the upper ends of the lifting cylinders 24. A lifting piston 28 is sleeved on one side of the temporary support rod 27 inserted into the lifting cylinder 24. A limiting ring is horizontally provided at the lower end of the lifting cylinder 24, and the lifting cylinder 24 is horizontally connected to the lower end of the limiting ring with an air joint. The lower end of the docking seat 25 is provided with a conical matching groove 26, and the upper end of the temporary support rod 27 is vertically inserted into the conical matching groove 26. The upper end of the temporary support rod 27 inserted into the conical matching groove 26 is provided with a conical surface, and when the temporary support rod 27 is lifted to the maximum extent, the vertical height of the upper load-bearing plate 4 from the flip seat plate 9 is equal to the vertical height of the upper end of the second side support plate 12 from the flip seat plate 9. Before the flip seat plate 9 and the single-point weighing sensor module 11 are disassembled, high-pressure gas is sent into the lifting cylinder 24, and the four temporary support rods 27 are lifted under the action of the lifting piston 28. At this time, the upper end of the temporary support rod 27 is aligned and plugged into the conveying bracket 2 under the action of the conical surface, and the temporary support rod 27 horizontally supports the conveying bracket 2. At this time, the first fixing screw 14 and the second fixing screw 15 can be loosened to disassemble the flip seat plate 9 and the single-point weighing sensor module 11; If the material moving above the conveying bracket 2 does not need to be weighed at this time, the support of the four temporary support rods 27 does not require the conveying bracket 2 to be shut down, and the material transportation above can proceed normally, further increasing production efficiency. After the single-point weighing sensor module 11 is replaced, the temporary support rod 27 and the lifting piston 28 can naturally fall back to the bottom under the action of their own gravity, so that the temporary support rod 27 is separated from the docking seat 25, avoiding the support of the temporary support rod 27 from affecting the accuracy of the weighing data. In order to ensure the rapid fall of the temporary support rod 27, a counterweight block can be set in the temporary support rod 27, or the temporary support rod 27 can be provided with a reset spring above the lifting piston 28, so that the temporary support rod 27 can quickly detach from the docking seat 25.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Automatic conveyor weighing machine, characterized in that: include: A mounting frame (1), wherein a conveying bracket (2) is horizontally arranged above the mounting frame (1), two supporting pads (3) are symmetrically arranged at the lower end of the conveying bracket (2), an upper load-bearing plate (4) is horizontally arranged at the center of the lower ends of the two supporting pads (3), a load-bearing beam seat (5) is horizontally fixedly arranged on the mounting frame (1) directly below the upper load-bearing plate (4), and a single-point weighing sensor module (11) is installed between the upper load-bearing plate (4) and the load-bearing beam seat (5) via a quick-connect assembly and a flip connection assembly; The flip connection assembly comprises a load-bearing support rod (8) and a flip seat plate (9); an embedding combination groove (6) is provided through one side of the load-bearing beam seat (5); the load-bearing support rod (8) is horizontally arranged on one side of the embedding combination groove (6); one side of the flip seat plate (9) is movably sleeved with the load-bearing support rod (8); and the quick-connect assembly comprises two assembly connection ears (13); A temporary support assembly is provided between the mounting frame (1) and the support pad (3), and comprises four lifting cylinders (24), four temporary support rods (27) and four docking seats (25).

2. The automatic conveying weighing machine according to claim 1, characterized in that: One side of the embedded combined groove (6) penetrates through the load-bearing beam seat (5) to form a removal slot (7), one side of the load-bearing support rod (8) is inserted into the center of the removal slot (7), and the thickness of the flip seat plate (9) is smaller than the width of the removal slot (7).

3. The automatic conveying weighing machine according to claim 2, characterized in that: A first side mounting support plate (10) is vertically provided on one side of the upper end of the flip seat plate (9); a single-point weighing sensor module (11) is horizontally provided on one side of the first side mounting support plate (10) by means of bolts; a second side mounting support plate (12) is fixedly provided on the side of the single-point weighing sensor module (11) away from the first side mounting support plate (10) by means of bolts; a quick-connect plate is horizontally provided on the upper end of the second side mounting support plate (12); two assembly connection ears (13) are symmetrically provided on one side of the upper load-bearing plate (4) close to the quick-connect plate; the quick-connect plate of the second side mounting support plate (12) is plugged into the two assembly connection ears (13); both assembly connection ears (13) are horizontally penetrated and plugged with a first fixing screw (14) by means of a thread, and the first fixing screw (14) penetrates and plugs into the quick-connect plate of the second side mounting support plate (12).

4. The automatic conveying weighing machine according to claim 3, characterized in that: The load-bearing beam seat (5) is located in the embedded combination groove (6) and is away from the load-bearing support rod (8) on a side thereof, and is provided with two second fixing screws (15) which are inserted and inserted horizontally through threads. When the flip seat plate (9) is horizontally placed in the embedded combination groove (6), the two second fixing screws (15) are inserted and inserted into the flip seat plate (9) respectively.

5. The automatic conveying weighing machine according to claim 4, characterized in that: A lap groove (16) is provided at the lower end of the load-bearing beam seat (5) near the removal slot (7), and a flip positioning box (17) is horizontally provided on the flip seat plate (9) at one side of the lap groove (16), and the flip positioning box (17) is horizontally inserted into the lap groove (16).

6. The automatic conveying weighing machine according to claim 5, characterized in that: A telescopic slot (19) is horizontally provided in the flip positioning box (17), an auxiliary support rod (20) is horizontally movably inserted in the telescopic slot (19), a support slot (29) is horizontally penetrated through one side of the load-bearing support rod (8) located in the removal slot (7), and one side of the auxiliary support rod (20) movably penetrates the flip positioning box (17) and one side of the removal slot (7) and is inserted into the support slot (29).

7. The automatic conveying weighing machine according to claim 6, characterized in that: A strip groove is provided in the telescopic groove (19) and passes through the flip positioning box (17); a push-pull rod (22) is provided on one side of the auxiliary support rod (20) located in the telescopic groove (19); the push-pull rod (22) movably passes through the plug-in strip groove; a retaining spring (21) is horizontally provided on one side of the telescopic groove (19) away from the load-bearing support rod (8), and one side of the auxiliary support rod (20) is in contact with the retaining spring (21).

8. The automatic conveying weighing machine according to claim 7, characterized in that: The four docking seats (25) are symmetrically arranged at the lower ends of the two supporting pads (3), and the upper end of the mounting frame (1) directly below the docking seats (25) is horizontally provided with an assembly pad (23), and the four lifting cylinders (24) are respectively vertically arranged at the upper end centers of the four assembly pads (23).

9. The automatic conveying weighing machine according to claim 8, characterized in that: The lower ends of the four temporary support rods (27) are respectively and vertically movably plugged into the upper end of the lifting cylinder (24); a lifting piston (28) is sleeved on one side of the temporary support rod (27) plugged into the lifting cylinder (24); a limiting ring is horizontally provided at the lower end of the lifting cylinder (24); and a gas joint is horizontally connected to the lower end of the limiting ring of the lifting cylinder (24).

10. The automatic conveying weighing machine according to claim 9, characterized in that: The lower end of the docking seat (25) is provided with a conical matching groove (26), the upper end of the temporary support rod (27) is vertically inserted into the conical matching groove (26), the upper end of the temporary support rod (27) inserted into the conical matching groove (26) is provided with a conical surface, and when the temporary support rod (27) is lifted to the maximum extent, the vertical height of the upper bearing plate (4) from the flip seat plate (9) is equal to the vertical height of the upper end of the second side support plate (12) from the flip seat plate (9).

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