CN220864742U - Organic plate workpiece recycling production line - Google Patents

Abstract

The application relates to an organic plate workpiece recycling production line, which comprises a thermal oven, wherein a thermal drying channel with two ends penetrating is arranged in the thermal drying channel, and a heating module is arranged in the thermal drying channel and is used for heating and softening organic plate workpieces conveyed through the thermal drying channel; the first transfer manipulator is arranged at the downstream position of the hot oven and is positioned at the outlet of the hot oven channel; and the molding equipment is arranged at the downstream of the first transfer manipulator, and is used for receiving the organic plate workpiece transferred by the first transfer manipulator from the hot oven and molding the organic plate workpiece into an organic plate sheet. The method does not cut or crush the organic plate, so that the fiber length of the organic plate is basically and completely reserved and is not damaged, and the molded organic plate can obtain almost all mechanical properties of the thermoplastic composite material, and the product obtained by secondary processing of the organic plate has excellent and reliable service performance.

Description

Organic plate workpiece recycling production line

Technical Field

The application relates to the technical field of material recovery processing, in particular to an organic plate workpiece recovery production line.

Background

The organic plate is a thermoplastic composite plate which consists of continuous fibers and thermoplastic resin and has the characteristics of light weight, high strength and compression molding, and the thermoplastic composite plate is widely applied to various fields of automobile industry, aerospace, sports, military industry, electronics and the like.

With the gradual expansion of the market of thermoplastic composite products, the number of scrapped products generated each year is continuously increased, and the organic plate products need to be recycled for secondary use in consideration of improving the recycling rate of resources, saving energy, reducing consumption and the like. At present, the traditional recovery method of the organic plate workpiece generally breaks (by cutting, crushing and the like) the organic plate workpiece, changes long fibers of the thermoplastic composite material into short fibers and then re-granulates the short fibers, but the treatment mode can greatly destroy the fiber length, the performance after re-granulation is greatly reduced, and the original characteristics of the thermoplastic composite material are damaged.

Disclosure of Invention

Based on the problems, the performance of the thermoplastic composite material is obviously reduced after granulation, and the organic plate part recycling production line is provided.

The application provides an organic plate workpiece recycling production line, which comprises the following steps:

The heating device comprises a thermal oven, a heating module and a heating module, wherein the thermal oven is provided with a thermal drying channel with two ends penetrating through the thermal drying channel, and the heating module is used for heating and softening organic plate parts conveyed through the thermal drying channel;

The first transfer manipulator is arranged at the downstream position of the hot oven and is positioned at the outlet of the hot baking channel; and

The molding equipment is arranged at the downstream of the first transfer manipulator and is used for receiving the organic plate workpiece transferred from the hot oven by the first transfer manipulator and molding the organic plate workpiece into an organic plate sheet.

When the organic plate workpiece recovery production line works, the organic plate workpiece to be recovered and treated is sent into the hot drying channel of the hot drying oven and can be conveyed and moved along the hot drying channel, and the heating treatment of the heating module is received in the process, so that the organic plate workpiece is softened after being heated to a preset temperature until the softened organic plate workpiece is sent out from the outlet of the hot drying channel, then the first transfer manipulator immediately picks up the organic plate workpiece and transfers the organic plate workpiece into the molding equipment, and the molding equipment immediately molds the organic plate workpiece, so that the organic plate workpiece is prepared, and the recovery treatment of the organic plate workpiece can be completed. Compared with the prior art, the method has the advantages that the organic plate workpiece is not cut or broken, so that the fiber length of the organic plate workpiece is basically and completely reserved and is not damaged, almost all mechanical properties of the thermoplastic composite material can be obtained by the organic plate material after compression molding, and the workpiece after secondary processing of the organic plate material has excellent and reliable use performance.

The technical scheme of the application is further described as follows:

In one embodiment, the organic board product recycling line further comprises a second transfer manipulator, wherein the second transfer manipulator is arranged at a position downstream of the molding equipment and is used for taking out the processed organic board sheets from the molding equipment.

In one embodiment, the organic board product recycling line further includes a finished product storage bin, the finished product storage bin is disposed at a position downstream of the second transfer manipulator, and the finished product storage bin is used for receiving the organic board sheets taken out from the molding device and transferred by the second transfer manipulator.

In one embodiment, the thermal oven further comprises a conveying module, the conveying module is disposed in the thermal drying channel, and the conveying module is used for conveying the organic plate workpiece.

In one embodiment, the thermal oven further comprises a controller and a temperature sensor, wherein the temperature sensor is arranged on the side wall of the thermal oven or the conveying module and used for detecting the temperature of the organic plate workpiece in real time, and the temperature sensor and the heating module are respectively and electrically connected with the controller.

In one embodiment, the organic board product recycling line further comprises a temporary storage table, the temporary storage table is arranged between the outlet of the hot drying channel and the first transfer manipulator, a blocking rod is arranged on the top surface of the temporary storage table, a temporary storage cavity is formed by surrounding the blocking rod, and the temporary storage cavity is used for temporarily storing the organic board products sent out from the hot drying channel.

In one embodiment, the first transfer manipulator and the second transfer manipulator each comprise a base, a flexible manipulator and a clamping jaw, one end of the flexible manipulator is arranged on the base, and the other end of the flexible manipulator is connected with the clamping jaw.

In one embodiment, the molding device comprises a machine base, a molding fixed die, a molding movable die and a molding power source, wherein a molding cavity is formed in the machine base, the molding fixed die is arranged at the bottom side of the molding cavity, the molding movable die is arranged at the top side of the molding cavity and is longitudinally spaced relative to the molding fixed die, and the molding power source is arranged on the machine base and is connected with the molding movable die and used for driving the molding movable die to be close to or far away from the molding fixed die.

In one embodiment, the molding apparatus further includes a plurality of auxiliary molding frames, any one of the plurality of auxiliary molding frames being detachably mountable to the molding die, each of the auxiliary molding frames being different in size.

In one embodiment, one of the auxiliary forming frame and the compression moving die is provided with a positioning column, the other one of the auxiliary forming frame and the compression moving die is provided with a positioning hole, and the positioning column is detachably inserted into the positioning hole.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an organic board recycling line according to an embodiment of the application.

Fig. 2 is an enlarged structural view of the oven of fig. 1.

Reference numerals illustrate:

100. Organic plate workpiece recycling production line; 10. a thermal oven; 11. a hot baking channel; 12. a heating module; 13. a conveying module; 20. a first transfer robot; 21. a base; 22. a flexible mechanical arm; 23. a clamping jaw; 30. a molding apparatus; 31. a base; 32. molding a fixed mold; 33. molding a movable mold; 34. molding a power source; 40. a second transfer robot; 50. a finished product storage bin; 60. a temporary storage table; 200. an organic sheet product; 300. an organic sheet.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1 and 2, an organic sheet product recycling line 100 according to an embodiment of the present application includes a thermal oven 10, a first transfer robot 20, and a molding apparatus 30.

The hot oven 10 is provided with a hot drying tunnel 11 having both ends penetrating therethrough.

For example, in this embodiment, the oven 10 is a rectangular box, and is mounted on the ground or a pad on the ground in a horizontal position, the length direction of the oven 10 is located in a horizontal plane, and the oven tunnel 11 extends along the length direction of the oven 10.

In this embodiment, the thermal oven 10 further includes a conveying module 13, the conveying module 13 is disposed in the thermal drying channel 11, and the conveying module 13 is used for conveying the organic board workpieces 200.

The hot drying tunnel 11 has an inlet and an outlet at opposite ends, the organic sheet 200 is fed from the inlet onto the conveyor module 13, and the conveyor module 13 conveys the organic sheet 200 along the hot drying tunnel 11 and finally out of the outlet. The conveying module 13 may be any one of a belt pulley mechanism, a conveying roller mechanism, a chain plate mechanism and the like, and is specifically selected according to actual needs.

It should be noted that the organic board assembly 200 in this embodiment may be an automobile bumper beam, an electronic device frame strip, or the like. Taking an automobile anti-collision beam as an example, the automobile anti-collision beam is installed at the head of an automobile and is directly exposed to the environment during use, so that dirt such as dust, greasy dirt and the like is inevitably polluted during recycling of the automobile anti-collision beam, and pollution problems can be caused if recycling is directly carried out at this moment.

Therefore, in practice, cleaning equipment is also typically installed upstream of the thermal oven 10. The organic board assembly 200 is first put into a cleaning apparatus for cleaning the surface contaminated with dust, oil and other contaminants, and then taken out of the cleaning apparatus and then put into the thermal oven 10, so that the contamination problem can be prevented.

With continued reference to fig. 2, in addition, a heating module 12 is disposed in the hot drying tunnel 11, the heating module 12 is configured to heat and soften the organic sheet workpiece 200 conveyed through the hot drying tunnel 11, the first transfer robot 20 is disposed at a downstream position of the hot drying oven 10 and located at an outlet of the hot drying tunnel 11, the molding device 30 is disposed downstream of the first transfer robot 20, and the molding device 30 is configured to receive the organic sheet workpiece 200 transferred from the hot drying oven 10 by the first transfer robot 20 and mold the organic sheet workpiece 200 into the organic sheet material 300.

In summary, implementing the technical scheme of the embodiment has the following beneficial effects: when the organic sheet product recycling line 100 of the above-mentioned scheme works, the organic sheet product 200 to be recycled is sent into the heat drying channel 11 of the heat oven 10 and can be transferred along the heat drying channel 11, and in the process, the heating treatment of the heating module 12 is received, so that the organic sheet product 200 is heated to a preset temperature and then is softened, until the softened organic sheet product 200 is sent out from the outlet of the heat drying channel 11, then the first transfer manipulator 20 immediately picks up the organic sheet product 200 and transfers the organic sheet product 200 into the molding equipment 30, and the molding equipment 30 immediately performs the molding processing on the organic sheet product 200, thereby preparing the organic sheet product 300, and recycling the organic sheet product 200 can be completed. Compared with the prior art, the method does not cut or crush the organic sheet material 200, so that the fiber length of the organic sheet material 200 is basically and completely maintained and is not damaged, and the molded organic sheet material 300 can obtain almost all mechanical properties of the thermoplastic composite material, and the product obtained by secondary processing of the organic sheet material 300 has excellent and reliable service performance.

On the basis of the above embodiment, the organic sheet product recycling line 100 further includes a second transfer robot 40, where the second transfer robot 40 is disposed at a downstream position of the molding apparatus 30 and is used to take out the processed organic sheet material 300 from the molding apparatus 30. The second transfer robot 40 takes out the molded organic sheet 300 from the molding apparatus 30, thereby freeing the molding cavity in the molding apparatus 30, so that the first transfer robot 20 transfers the next organic sheet 200 into the molding cavity, realizing continuous molding, and improving production efficiency.

With reference to fig. 1, in this embodiment, in order to reduce the design and manufacturing costs and reduce the later maintenance difficulty, the first transfer manipulator 20 and the second transfer manipulator 40 are designed in the same structure, and specifically, the first transfer manipulator 20 and the second transfer manipulator 40 each include a base 21, a flexible manipulator 22 and a clamping jaw 23, one end of the flexible manipulator 22 is mounted on the base 21, and the other end of the flexible manipulator 22 is connected with the clamping jaw 23.

The base 21 is used for loading and fixing the flexible mechanical arm 22 and the clamping jaw 23, and the base 21 has a certain weight design, so that the gravity centers of the first transfer mechanical arm 20 and the second transfer mechanical arm 40 can be ensured to be as low as possible, and the first transfer mechanical arm 20 and the second transfer mechanical arm 40 can be ensured to be stably and reliably installed on the ground without easy toppling.

Further, a plurality of moving wheels can be installed on the bottom surface of the base 21, so that the first transferring manipulator 20 and the second transferring manipulator 40 have moving capability, and the position of the working position can be conveniently and flexibly adjusted or changed to different working sites.

The flexible mechanical arm 22 is a multi-axis mechanical arm, and has rotational degrees and linear movement degrees of freedom in multiple directions, so that the flexible mechanical arm 22 has high flexibility in movement, is suitable for various space and environmental conditions, and ensures that the clamping jaw 23 can accurately clamp the organic board workpieces 200 sent out from the hot drying channel 11.

The holding jaw 23 may be any one or a combination of at least two of a mechanical holding jaw, an adsorption holding jaw, an adhesive holding jaw, and the like, and is specifically selected according to actual needs, and is not particularly limited.

With continued reference to fig. 1, in addition, the organic sheet recycling line 100 further includes a finished product storage bin 50, where the finished product storage bin 50 is disposed at a downstream position of the second transfer robot 40, and the finished product storage bin 50 is configured to receive the organic sheet 300 that is taken out from the molding device 30 and transferred by the second transfer robot 40.

Therefore, the molded organic sheet 300 can be quickly transferred to the finished product storage bin 50 for centralized storage after being taken out from the molding device 30 by the second transfer manipulator 40, so that the organic sheet 300 can be intensively processed later. For example, the finished storage bin 50 includes a pallet on which the organic sheet material 300 is stacked from bottom to top. Or the finished product storage bin 50 comprises a supporting plate and a layer rack arranged on the supporting plate, wherein the layer rack is provided with a plurality of layers of placing bins which are vertically arranged at intervals, and at least one organic sheet material 300 can be contained in each placing bin, and the organic sheet material 300 is independently and separately placed, so that the organic sheet material 300 can be conveniently taken out according to the required quantity.

It is easy to understand that the heating module 12 is used for creating a high temperature environment for the hot drying tunnel 11, so that the organic sheet 200 in the hot drying tunnel 11 is heated and softened, the hardness of the softened organic sheet 200 is reduced, and the plasticity is enhanced, so that the subsequent pressing of the organic sheet 300 in the desired shape and size by the molding device 30 is more convenient.

However, it should be noted that the heating degree of the heating module 12 to the organic board workpiece 200 needs to be precisely controlled, so that the organic board workpiece 200 cannot be heated to be excessively softened, and thus the subsequent first transfer robot 20 cannot pick up and release the organic board workpiece 200 normally.

In view of the above, in still other embodiments, the thermal oven 10 further includes a controller and a temperature sensor, wherein the temperature sensor is disposed on a sidewall of the thermal oven 10 or the conveying module 13 and is used for detecting the temperature of the organic board product 200 in real time, and the temperature sensor and the heating module 12 are respectively electrically connected to the controller.

Therefore, the temperature sensor is used for accurately monitoring the heating temperature in real time, so that the organic plate workpiece 200 can be heated for a proper time to a proper softening hardness, and the problem that the organic plate workpiece 200 is inconvenient to take and place is avoided. The controller is used for timely sending an instruction to the heating module 12 after acquiring the signal fed back by the temperature sensor, so that the heating module 12 stops overheating the organic board workpiece 200.

Optionally, the heating module 12 may be any one or a combination of at least two of a heating wire, a heating pipe, a heating sheet, and the like, which is specifically selected flexibly according to actual needs.

With continued reference to fig. 1, in addition, the organic board product recycling line 100 further includes a temporary storage stage 60, where the temporary storage stage 60 is disposed between the outlet of the hot drying channel 11 and the first transfer manipulator 20, and a top surface of the temporary storage stage 60 is provided with a blocking rod, and the blocking rod forms a temporary storage cavity for temporarily storing the organic board product 200 sent from the hot drying channel 11.

When the first transfer manipulator 20 grabs the previous organic board member 200 sent out from the hot drying channel 11 and transfers the organic board member 200 to the molding device 30, the temporary storage cavity of the temporary storage table 60 can take over the first transfer manipulator 20 to receive the next organic board member 200 sent out from the hot drying channel 11, and when the first transfer manipulator 20 releases the previous organic board member 200 to the molding device 30 and returns to the temporary storage table 60, the next organic board member 200 in the temporary storage cavity can be grabbed directly, so that the organic board member 200 can be continuously discharged from the hot drying channel 11 at a faster rhythm, the discharging speed can be exactly matched with the taking and placing speed of the first transfer manipulator 20, and therefore, the operation of the hot oven 10 and the first transfer manipulator 20 in an optimal matching state is ensured, and the production efficiency is improved.

It can be understood that the organic board 200 sent out from the conveying module 13 in the drying channel 11 at a certain speed still has an electromotive force of continuous sliding after falling onto the temporary storage table 60 due to inertia, and the organic board 200 can be prevented from sliding off the temporary storage table 60 by blocking by the blocking rod.

With continued reference to fig. 1, in some embodiments, the molding apparatus 30 includes a base 31, a molding die 32, a molding movable die 33, and a molding power source 34, where a molding cavity is formed in the base 31, the molding die 32 is disposed at a bottom side of the molding cavity, the molding movable die 33 is disposed at a top side of the molding cavity and is longitudinally spaced apart from the molding die 32, and the molding power source 34 is disposed on the base 31 and is connected to the molding movable die 33 for driving the molding movable die 33 to approach or separate from the molding die 32.

During pressing, the molding power source 34 drives the molding movable mold 33 to approach the molding fixed mold 32, and the molding movable mold 33 and the molding fixed mold 32 can squeeze the organic sheet member 200 from both sides, so that the organic sheet member 200 is flattened to become the organic sheet member 300.

It should be noted that the prepared organic board sheet 300 is actually a semi-finished product raw material of the new organic board product 200 obtained by the next hot press molding, that is, the organic board sheet 300 is directly adopted, so that the process steps of separate tabletting after the traditional recycling process can be omitted, the production efficiency is obviously improved, and the processing energy consumption is obviously reduced for a tabletting manufacturer.

Further, the molding apparatus 30 further includes a plurality of auxiliary molding frames, any one of which can be detachably mounted to the molding die 33, each of which is different in size. By mounting the auxiliary molding frame of a desired size onto the molding die 32, the pressed organic sheet 300 of the same size as the auxiliary molding frame is obtained, so that various sizes of the organic sheet 300 can be obtained to satisfy different use cases.

In order to prevent the auxiliary forming frame from loosening and shifting during the sheet forming of the organic plate, and further affect the forming shape and dimensional accuracy of the organic plate 300, on the basis of the above embodiment, one of the auxiliary forming frame and the molding moving die 33 is provided with a positioning column, the other of the auxiliary forming frame and the molding moving die 33 is provided with a positioning hole, and the positioning column is detachably inserted into the positioning hole.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. An organic sheet product recycling line, comprising:

The heating device comprises a thermal oven, a heating module and a heating module, wherein the thermal oven is provided with a thermal drying channel with two ends penetrating through the thermal drying channel, and the heating module is used for heating and softening organic plate parts conveyed through the thermal drying channel;

The first transfer manipulator is arranged at the downstream position of the hot oven and is positioned at the outlet of the hot baking channel; and

The molding equipment is arranged at the downstream of the first transfer manipulator and is used for receiving the organic plate workpiece transferred from the hot oven by the first transfer manipulator and molding the organic plate workpiece into an organic plate sheet.

2. The organic sheet product recycling line according to claim 1, further comprising a second transfer robot disposed at a position downstream of the molding apparatus and configured to remove the processed organic sheet product from the molding apparatus.

3. The organic sheet product recycling line according to claim 2, further comprising a finished product storage bin disposed at a position downstream of the second transfer robot, the finished product storage bin being configured to receive the organic sheet product that the second transfer robot takes out from the molding apparatus and transfers it.

4. The organic sheet product recycling production line according to claim 3, wherein the thermal oven further comprises a conveying module, the conveying module is disposed in the thermal drying channel, and the conveying module is used for conveying the organic sheet product.

5. The recycling production line of organic board workpieces according to claim 4, wherein the thermal oven further comprises a controller and a temperature sensor, the temperature sensor is arranged on the side wall of the thermal oven or the conveying module and used for detecting the temperature of the organic board workpieces in real time, and the temperature sensor and the heating module are respectively and electrically connected with the controller.

6. The organic board product recycling production line according to claim 5, further comprising a temporary storage table, wherein the temporary storage table is arranged between the outlet of the hot drying channel and the first transfer manipulator, a surrounding stop lever is arranged on the top surface of the temporary storage table, a temporary storage cavity is formed by surrounding the surrounding stop lever, and the temporary storage cavity is used for temporarily storing the organic board product sent out from the hot drying channel.

7. The organic board product recycling production line according to claim 2, wherein the first transfer manipulator and the second transfer manipulator comprise a base, a flexible manipulator and clamping jaws, one end of the flexible manipulator is arranged on the base, and the other end of the flexible manipulator is connected with the clamping jaws.

8. The organic board product recycling production line according to claim 1, wherein the molding equipment comprises a machine base, a molding fixed die, a molding movable die and a molding power source, wherein a molding cavity is formed in the machine base, the molding fixed die is arranged on the bottom side of the molding cavity, the molding movable die is arranged on the top side of the molding cavity and is longitudinally spaced opposite to the molding fixed die, and the molding power source is arranged on the machine base and connected with the molding movable die and is used for driving the molding movable die to be close to or far away from the molding fixed die.

9. The organic board recycling line of claim 8, wherein the molding apparatus further comprises a plurality of auxiliary molding frames, any one of the plurality of auxiliary molding frames being detachably mountable to the molding die, each of the auxiliary molding frames being different in size.

10. The recycling line for organic board products according to claim 9, wherein one of the auxiliary forming frame and the molding moving die is provided with a positioning column, the other one of the auxiliary forming frame and the molding moving die is provided with a positioning hole, and the positioning column is detachably inserted into the positioning hole.