Turntable high-speed weighing device

Abstract

The present invention provides a turntable high-speed weighing device, comprising a fixed frame and a weighing module mounted around the fixed frame, wherein the weighing bucket of the weighing module extends out of the fixed frame, and an opening device corresponding to each weighing bucket is arranged on the fixed frame, and the opening device is used to open the weighing bucket; wherein a rotatable conveying module is also arranged around the fixed frame, and the conveying module is located below the weighing module and is arranged corresponding to the weighing bucket; further comprising a material discharge device, which is connected to the fixed frame, and is used to open a single conveying bucket in the conveying module; the conveying module can cyclically correspond to the weighing bucket, and the respective opening devices and material discharge devices are independently controlled, so the weighing bucket can prepare for the weighing action of the next process during the material transportation, thereby saving a lot of waiting time, and the weighing module is detachable and can be disassembled and adjusted at any time without affecting the work of the conveying bucket below, thereby achieving the effect of reasonable material flow sequence and accurate weighing.

Description

Technical Field

[0001] The invention relates to the technical field of ingredient weighing devices, in particular to a turntable type high-speed weighing device. Background Art

[0002] In industrial production, especially in pharmaceutical production, we often encounter situations where multiple material ratios are controlled. In most cases, workers weigh different raw materials according to the required ratios, and then add the weighed raw materials into the insulation barrel in turn. After a series of processes such as stirring and mixing, the finished product is finally obtained. In this process, not only does it require multiple workers to cooperate in the operation, which is labor-intensive, but it is also easily affected by the proficiency of the workers, and the batching accuracy is not high, which affects the final quality of the finished product. With the upgrading of my country's manufacturing enterprises, improving the level of automation has become more and more the key to improving the efficiency of enterprises. At present, the existing small-material multi-station assembly line automatic weighing batching device adopts a multi-station batching system that moves the mixing container to the bottom of the feeding mechanism. This batching system is highly efficient and has sufficient installation space. However, the corresponding automatic weighing batching device generally uses a roller conveyor line or a chain conveyor line to move the weighing container to the weighing station under the feeding mechanism for weighing and batching. The use of roller conveyor lines has the disadvantage of difficulty in installing the weighing device; the use of chain conveyor lines has the disadvantages of large chain gaps, easy material accumulation and difficulty in cleaning; when implementing the batching of multiple material formulas, there are disadvantages such as complex structure, large volume, poor weighing accuracy, poor reliability and low weighing efficiency.

[0003] In the prior art, for example, the document with application number 201820106658.4 discloses a multi-station double-crawler automatic weighing and batching device; including: a number of weighing stations on the double-crawler conveyor line, wherein: each weighing station is provided with a feeding mechanism connected to the control cabinet and a liftable weighing platform, and a photoelectric position detection switch and a pneumatic blocking rod connected to the control cabinet are provided in front of the weighing station; it can realize automatic, efficient and accurate feeding and conveying work; the device also needs to wait for the next empty conveying bucket after weighing and conveying at a single station, which will waste time because weighing still needs time, and if there is an error in weighing, all operations must be stopped. It can be seen that there are at least three related technical problems in the prior art: 1. First, the material weighing flow order is unreasonable, resulting in the need to wait for the weighing bucket to weigh the transported materials; 2. When a weighing error occurs, the single station can be adjusted in time without affecting other operating processes; 3. Ensure the accurate weighing of materials. Summary of the invention

[0004] In order to solve the existing problems, the present invention provides a rotary weighing device, and each workstation weighing module is independently detachable, and a corresponding rotatable transport station is provided at the bottom, which ensures that the weighing module itself can carry out the weighing of the next process only after unloading the material, and there is no need to wait for operation. Then the operation process can be carried out at high speed, and each workstation can be weighed accurately. It is detachable, and can still operate normally when an abnormality occurs in a certain workstation, and will not affect the weighing of the material.

[0005] The present invention is a turntable high-speed weighing device, comprising a fixed frame and a weighing module mounted around the fixed frame, wherein the weighing bucket of the weighing module extends out of the fixed frame, and an opening device corresponding to each weighing bucket is arranged on the fixed frame, and the opening device is used to open the weighing bucket; wherein a rotatable conveying module is also arranged around the fixed frame, and the conveying module is located below the weighing module and is arranged corresponding to the weighing bucket; and a material discharge device is also included, which is connected to the fixed frame and is used to open a single conveying bucket in the conveying module.

[0006] Preferably, the fixed frame includes a central bearing plate and a support rod arranged around the central bearing plate, the support rod is connected to the central bearing plate, and a weighing module is detachably connected to the central bearing plate; the opening device includes a first driving device and a first telescopic shaft, the first driving device is fixedly mounted on one end of the support rod away from the central bearing plate; the first driving device is used to drive the first telescopic shaft to extend so that the weighing bucket can unload materials.

[0007] Preferably, it also includes a second driving device and a rotating shaft, the rotating shaft is connected to the fixed frame, a conveying module is connected to the rotating shaft, and the motion trajectory of the conveying module is located on the unloading trajectory of the weighing bucket; the second driving device is used to control the rotation of the rotating shaft.

[0008] Preferably, the unloading device is arranged on the frame of the fixed frame, and the unloading device includes a third driving device and a third telescopic shaft, and the third driving device is used to drive the third telescopic shaft to extend so that the conveying bucket unloads the materials.

[0009] Preferably, the opening of the transport bucket is larger than the opening of the weighing bucket.

[0010] Preferably, the weighing module comprises a fixed plate, to which a linear vibration module is connected, a weighing bucket is arranged at a discharge port of the linear vibration module, the weighing bucket is connected to a weighing sensor, and the weighing sensor is fixed to the fixed plate.

[0011] Preferably, the weighing bucket comprises two side walls which open and close with each other, wherein one side wall is fixedly connected to the weighing sensor, and an opening and closing portion is arranged at one end of the other side wall close to the opening, and the opening and closing portion is spaced apart from the first telescopic axis.

[0012] Preferably, two limiting slide rails are provided on the central bearing plate, and the long sides of the fixed plate are engaged between the limiting slide rails, and a limiting bottom plate is also included, which is arranged between the limiting slide rails and abuts against the wide sides of the fixed plate.

[0013] Preferably, the linear vibration module includes a base, an electromagnet is provided at one end of the base, and at least two grooves are provided at the other end, a vibration plate is respectively attached to the slope surface of each groove close to the electromagnet, the other end of the vibration plate is connected to a transmission plate, and an armature is provided on the side of the transmission plate close to the electromagnet; wherein each vibration plate is arranged in parallel so that the transmission plate and the base are both in a horizontal state.

[0014] Preferably, a fixing column is installed on the surface of the base away from the electromagnet, and a fixing screw is coaxially arranged on the fixing column, and a spring is arranged outside the fixing screw and the fixing column; the fixing screw is used to fix to the fixing plate and extend out of the fixing plate to connect with the supporting plate, wherein the center supporting plate is also provided with a through groove for the fixing screw to extend out, and the through groove is arranged between the two limiting slide rails.

[0015] The beneficial effects of the present invention are as follows: the present invention provides a turntable high-speed weighing device, comprising a fixed frame and a weighing module mounted around the fixed frame, the weighing bucket of the weighing module extends out of the fixed frame, and an opening device corresponding to each weighing bucket is arranged on the fixed frame, and the opening device is used to open the weighing bucket; wherein a rotatable conveying module is also arranged around the fixed frame, the conveying module is located below the weighing module and is arranged corresponding to the weighing bucket; further comprising a material discharge device, the material discharge device is connected to the fixed frame, and the material discharge device is used to open a single conveying bucket in the conveying module; the conveying module can cyclically correspond to the weighing bucket, and the respective opening devices and material discharge devices are independently controlled, so the weighing bucket can prepare for the weighing action of the next process during the material transportation, saving a lot of waiting time, and at the same time the weighing module is detachably connected, can be disassembled and adjusted at any time, and will not affect the work of the conveying bucket below; thereby achieving the effect of reasonable material flow sequence and accurate weighing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic top view of the overall structure of the present invention;

[0017] Figure 2 It is a bottom view schematic diagram of the overall structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the transport bucket of the present invention;

[0019] Figure 4 It is a schematic diagram of the conveying bucket and the material unloading structure of the next process of the present invention;

[0020] Figure 5It is a schematic diagram of the weighing module structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the explosion of the weighing module of the present invention;

[0022] Figure 7 It is a schematic diagram of the weighing module and the conveying bucket structure of the present invention;

[0023] Figure 8 For the present invention Figure 2 A partial enlarged view of part A;

[0024] Fig. 9 This is a structural side view of the linear vibration module of the present invention with the outer shell removed;

[0025] Fig.10 The structural stereogram of the linear vibration module of the present invention with the outer shell removed.

[0026] Component Symbols

[0027] 1. Fixed frame; 11. Center bearing plate; 111. Limiting slide rail; 112. Limiting bottom plate; 113. Through slot;

[0028] 2. Weighing module; 21. Weighing bucket; 22. Opening device; 221. First driving device; 222. First telescopic shaft; 23. Fixing plate; 24. Linear vibration module; 241. Feeding port; 242. Weighing sensor; 243. Base; 2431. Electromagnet; 2432. Groove; 24321. Vibrating plate; 24322. Transmission plate; 24323. Armature; 2433. Fixing column; 24331. Fixing screw; 24332. Spring;

[0029] 3. Transport module; 31. Transport bucket; 32. Unloading device; 321. Third driving device; 322. Third telescopic shaft. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0031] In the following description, general election example details are given to provide a deeper understanding of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. It should be understood that the specific embodiments are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be understood that when the terms "comprise" and or "include" are used in this specification, they indicate the existence of the stated features, integers, steps, operations, elements or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0033] As described in the background technology, the flow weighing operation in the prior art, because the weighing device depends on the running device, the two can only weigh a single single operation of the material, and need to be paired one by one to complete the two actions of weighing and transporting. Under the premise of mutual influence between the two, it is easy to waste transportation time, and when a problem occurs in a single station, the existing equipment must be shut down as a whole for maintenance, resulting in all progress delays. If it is simply converted into a detachable form, the existing technology cannot be directly used. The first is the obstacle caused by the material operation form. With the assembly line operation, the material of a single weighing station cannot be replenished after the cycle; the second is that there is no good weighing component. Since weighing and unloading are two separate modules in the prior art, accurate weighing accuracy can only be achieved after debugging after installation. If the prior art is simply converted into a detachable mode, it will appear after reinstallation. Problems such as inaccurate weighing accuracy and offset of unloading position will occur. After the error accumulates many times, it will lead to defective products. Then in order to solve the above-mentioned correlation and decreasing technical problems, a technical solution is disclosed as follows.

[0034] Specifically discloses a turntable high-speed weighing device, please refer to Figure 1-Figure 4 , including a fixed frame 1, and a weighing module 2 mounted around the fixed frame 1, the weighing bucket 21 of the weighing module 2 extends out of the fixed frame 1, and the fixed frame 1 is provided with an opening device 22 corresponding to each weighing bucket 21, and the opening device 22 is used to open the weighing bucket 21; wherein, a rotatable conveying module 3 is also arranged around the fixed frame 1, and the conveying module 3 is located below the weighing module 2 and is arranged corresponding to the weighing bucket 21; and also includes a unloading device 32, the unloading device 32 is connected to the fixed frame 1, and the unloading device is used to open a single conveying bucket 31 in the conveying module 3. The so-called ring-shaped weighing module and conveying module are of turntable design and stacked design. The conveying bucket of the conveying module is installed under the weighing bucket of the weighing module, and the conveying module can rotate, while the weighing module does not rotate. The materials are distributed from the top to the respective weighing buckets, and then the weighing module is weighed for a fixed weight, and then the weighing bucket is opened by the opening device to allow the materials to fall into the conveying bucket. After the conveying bucket reaches the fixed unloading station, the unloading device opens the conveying bucket so that the materials flow to the next section for processing. Therefore, the weighing module can also weigh when the conveying bucket flows to the next station, and then wait for the next hopper to unload immediately; at the same time, the opening devices of the weighing bucket and the conveying bucket are different. Each weighing bucket corresponds to an opening device, and the conveying bucket only needs to install the unloading device at a fixed point for unloading, so the operation and weighing can be controlled separately.

[0035] In this example, see Figure 5-Figure 6The fixed frame 1 includes an outer frame, a central bearing plate 11, and a support rod arranged around the central bearing plate 11, the support rod is connected to the central bearing plate 11, and the opening device is connected to the other end of the support rod; the weighing module 2 is detachably connected to the central bearing plate 11; the opening device 22 includes a first driving device 221 and a first telescopic shaft 222, and the first driving device 221 is arranged on the side of the weighing bucket away from the support rod, and the first driving device is connected to the outer shell of the fixed frame; the first driving device 221 is used to drive the first telescopic shaft 222 to extend so that the weighing bucket can discharge materials. Specifically, it can be a telescopic motor, which is controlled by the industrial control module, and then drives the movable plate that extends out to press the weighing bucket to open, so that the material flows into the conveying bucket; then the industrial control module is an electric control mechanism that controls the operation of the overall process, and the control software is written in it to control the process. Specific industrial control modules include but are not limited to PLC systems, DCS systems (distributed control systems) and FCS systems (field bus control systems).

[0036] In this embodiment, a second driving device and a rotating shaft are also included. The rotating shaft is connected to the fixed frame. The conveying module 3 is connected to the rotating shaft. The motion track of the conveying module 3 is located on the unloading track of the weighing bucket 21. The second driving device is used to control the rotation of the rotating shaft. The second driving device can be a stepping motor or a hollow motor, etc., so as to drive the rotating shaft to rotate.

[0037] In this embodiment, the unloading device 32 is arranged on the frame of the fixed frame, and the unloading device 32 includes a third driving device 321 and a third telescopic shaft 322. The third driving device is used to drive the third telescopic shaft to extend so that the conveying bucket unloads. Similarly, it can be a telescopic motor, and the telescopic motor is controlled by the industrial control module.

[0038] In this embodiment, the opening of the transport bucket 31 is larger than the opening of the weighing bucket 21, so as to ensure that the material in the weighing bucket can completely fall into the transport bucket.

[0039] In this example, see Figure 4-Figure 8 The weighing module 2 includes a fixed plate 23, a linear vibration module 24 is connected to the fixed plate 23, a weighing bucket 21 is provided at a discharge port 241 of the linear vibration module 24, the weighing bucket 21 is connected to a weighing sensor 242, and the weighing sensor 242 is fixed to the fixed plate 23. The weighing bucket includes two side walls that open and close to each other, one side wall is fixedly connected to the weighing sensor, and an opening and closing portion is provided at one end of the other side wall close to the opening, and the opening and closing portion is spaced apart from the first telescopic axis. Through the precise adjustment of the vibration frequency at the discharge port, the vibration rate can be adjusted steplessly, and the discharge rate can also be adjusted steplessly, which can be adjusted to a nonlinear discharge process, where 80% of the material is dropped in the early stage, and then the vibration frequency is reduced to drop 20% of the material, thereby reducing the error.

[0040] In this embodiment, the fixed plate is detachably connected to the central bearing plate, so that a single station can be disassembled and adjusted separately, and at the same time, it can be ensured that the position of the linear vibration module and the weighing bucket will not change due to disassembly and assembly, thereby ensuring that the weighing accuracy is the same before and after disassembly and assembly, so as to realize a simple disassembly and assembly process. At the same time, since the central bearing plate is circularly arranged, the motion trajectory in this scheme is also a circular cycle trajectory. Therefore, after disassembling multiple weighing modules, there is no need to consider the position of the fixed station, and any installation can be performed. At the same time, the weighing and the conveying bucket below are not linearly bound and associated, so the position of the single station above can be changed without disrupting the entire material operation process. Two limiting slide rails 111 are also arranged on the central bearing plate 11, and the long sides of both sides of the fixed plate 23 are engaged between the limiting slide rails 111, which also includes a limiting bottom plate 112. The limiting bottom plate 112 is arranged between the limiting slide rails and abuts against the wide side of the fixed plate; the position of the fixed plate on the central bearing plate is limited by the engagement of three sides, so as to ensure that the weighing bucket is facing the conveying bucket below. At the same time, handles are provided on both sides of the fixing plate to facilitate the disassembly and assembly of the entire module.

[0041] In this example, see Figure 9-10 The linear vibration module 24 includes a base 243, one end of which is provided with an electromagnet 2431, and the other end is provided with at least two grooves 2432, and the slope surface of each groove 2432 close to the electromagnet is respectively fitted with a vibration plate 24321, and the other end of the vibration plate is connected to a transmission plate 24322, and an armature 24323 is provided on the side of the transmission plate close to the electromagnet; wherein each vibration plate is arranged in parallel so that the transmission plate and the base are both in a horizontal state. Since the electromagnet and the armature are set at an interval, the vibration they generate will not have mutual constraint loss due to structural contact, and the vibration rate can be accurately adjusted. At the same time, the vibration plate is fitted on the slope of the groove, and is the slope close to the armature side. Therefore, when the vibration plate vibrates, only the vibration on the armature side will be constrained, and there is no other structural constraint on the vibration in the feeding direction, which can greatly improve the vibration efficiency. The vibration loss in the feeding direction is less than that of the existing technology. Therefore, the vibration frequency can be accurately adjusted by passing alternating current through the electromagnet, thereby realizing multi-pole adjustment or even stepless adjustment of the feeding speed.

[0042] Preferably, a fixing column 2433 is installed on the surface of the base 243 away from the electromagnet, and a fixing screw is coaxially arranged on the fixing column. A spring 24332 is arranged on the fixing screw 24331 and the fixing column outer sleeve; the fixing screw is used to fix with the fixing plate and extend out of the fixing plate to connect with the central bearing plate, wherein the central bearing plate 11 is also provided with a through slot 113 for the fixing screw to extend out, and the through slot is arranged between the two limit slide rails. Through the non-rigid connection at the bottom, the downward force generated by the vibration can be reversely converted into the reaction force of the upward vibration by the spring, and at the same time, the vibration sheet arranged obliquely is cooperated to help the material to be gradually advanced. The overall feeding efficiency is greatly improved.

[0043] In this embodiment, the transmission plate includes a horizontal plate and a bent plate, the bent plate is arranged in parallel with the vibration plate, and the vibration plate farthest from the electromagnet is connected to the bent plate; the end of the horizontal plate close to the electromagnet is connected to the armature; the vibration plate is connected to the farthest end, which ensures that the overall structure can be stably placed when no magnetic force is generated, the structural stability is enhanced, and the influence of inertia force is weakened. The vibration plate is divided into an end vibration plate and a middle vibration plate according to the position, and the vibration plate farthest from the electromagnet is the end vibration plate, one end of the end vibration plate is in contact with the slope of the groove, and the other end is in contact with the bent plate; it also includes a pad, one end of the pad is in contact with the horizontal plate, and the other end is bent to one side of the groove to form a transition portion, and the transition portion is in contact with the middle vibration plate; the pad enables the middle vibration plate to better fit on the groove slope and the horizontal plate, so that its vibration force can be converted into material vibration to the greatest extent, thereby ensuring the accuracy and speed of feeding. Specifically, it comprises an end vibration plate and two middle vibration plates. Two middle vibration plates are evenly distributed between the end vibration plate and the armature in sequence. The middle vibration plate and the end vibration plate are arranged in parallel.

[0044] In the present embodiment, the groove that the middle vibration plate fits is the middle groove, and the slope of the middle groove close to the electromagnet is provided with a step, and the middle vibration plate is arranged on the step. The height of the middle vibration plate can be conveniently adjusted through the step to adjust the horizontal position of the transmission plate to meet the needs of various materials. In the present embodiment, the armature and the electromagnet are arranged in parallel and at intervals, and the armature and the transmission plate are preferably arranged vertically, and the armature and the transmission plate are connected to form a cantilever structure and are arranged at intervals from the base. And the product of the present invention is a sealed structure as a whole, and has good waterproof performance. From the above-mentioned sloped design of the linear vibration module and the tight design of the multi-layer vibration plate, the accuracy of stepless speed regulation is guaranteed, and at the same time, the vibration discharge port and the weighing sensor are arranged on the same fixed plate, so that it can also ensure its weighing accuracy after disassembly and assembly; at the same time, the material is transported in conjunction with the hopper with a circular motion trajectory below.

[0045] The technical effects of the present invention are:

[0046] The conveying module can circulate with the corresponding weighing bucket, and their respective opening devices and unloading devices are independently controlled, so the weighing bucket can prepare for the weighing action of the next process during the material transportation, saving a lot of waiting time. At the same time, the weighing module is detachably connected and can be disassembled and adjusted at any time without affecting the work of the conveying bucket below; thereby achieving the effect of reasonable material flow sequence and accurate weighing.

[0047] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A turntable high-speed weighing device, characterized in that: It includes a fixed frame, and a weighing module mounted around the fixed frame, wherein the weighing bucket of the weighing module extends out of the fixed frame, and an opening device corresponding to each weighing bucket is arranged on the fixed frame, and the opening device is used to open the weighing bucket; wherein a rotatable conveying module is also arranged around the fixed frame, and the conveying module is located below the weighing module and is arranged corresponding to the weighing bucket; and it also includes a material discharge device, which is connected to the fixed frame and is used to open a single conveying bucket in the conveying module; The fixing frame includes an outer frame, a central bearing plate, and a support rod arranged around the central bearing plate, one end of the support rod is connected to the central bearing plate, and the other end is equipped with an opening device; a weighing module is detachably connected to the central bearing plate; the opening device includes a first driving device and a first telescopic shaft, a first driving device is installed on the side of the weighing bucket away from the support rod, and the first driving device is connected to the outer frame; the first driving device is used to drive the first telescopic shaft to extend so that the weighing bucket can discharge materials; Among them, the weighing module includes a fixed plate, and the fixed plate is connected to the linear vibration module; the linear vibration module includes a base, an electromagnet is arranged at one end of the base, and at least two grooves are arranged at the other end, and the slope surface of each groove close to the electromagnet is respectively fitted with a vibration plate, and the other end of the vibration plate is connected to a transmission plate, and an armature is arranged on the side of the transmission plate close to the electromagnet; each vibration plate is arranged in parallel, so that the transmission plate and the base are in a horizontal state; the transmission plate includes a horizontal plate and a bending plate, the bending plate is arranged in parallel with the vibration plate, and the vibration plate farthest from the electromagnet is fitted and connected with the bending plate.

2. The turntable high-speed weighing device according to claim 1, characterized in that: It also includes a second driving device and a rotating shaft, the rotating shaft is connected to the fixed frame, the rotating shaft is connected to a conveying module, and the movement track of the conveying module is located on the unloading track of the weighing bucket; the second driving device is used to control the rotation of the rotating shaft.

3. The turntable high-speed weighing device according to claim 2, characterized in that: The unloading device is arranged on the frame of the fixing frame, and comprises a third driving device and a third telescopic shaft, wherein the third driving device is used for driving the third telescopic shaft to extend so that the conveying bucket unloads the materials.

4. The turntable high-speed weighing device according to claim 1, characterized in that: The opening of the transport bucket is larger than the opening of the weighing bucket.

5. The turntable high-speed weighing device according to claim 1, characterized in that: A weighing bucket is provided at the discharge port of the linear vibration module, and a weighing sensor is connected to the weighing bucket, and the weighing sensor is fixed on the fixing plate.

6. The turntable high-speed weighing device according to claim 5, characterized in that: The weighing bucket comprises two side walls which open and close to each other, wherein one side wall is fixedly connected to the weighing sensor, and an opening and closing portion is arranged at one end of the other side wall close to the opening, and the opening and closing portion is arranged at a distance from the first telescopic shaft.

7. The turntable high-speed weighing device according to claim 5, characterized in that: Two limiting slide rails are also arranged on the central bearing plate, and the long sides of the fixed plate are engaged between the limiting slide rails. The limiting bottom plate is also included, and the limiting bottom plate is arranged between the limiting slide rails to abut against the wide sides of the fixed plate.

8. The turntable high-speed weighing device according to claim 7, characterized in that: A fixing column is also installed on the surface of the base away from the electromagnet, and a fixing screw is coaxially arranged on the fixing column, and a spring is arranged outside the fixing screw and the fixing column; the fixing screw is used to fix with the fixing plate and extends out of the fixing plate to connect with the center bearing plate, wherein the center bearing plate is also provided with a through groove for the fixing screw to extend out, and the through groove is arranged between the two limiting slide rails.

Images