Machine tool trial machining device

By designing a machine tool trial processing device including bearing components, trial processing box and connection components, the problem of cutting fluid contamination during the machine tool test is solved, and the cleaning process is simplified and the trial processing efficiency is improved.

CN223029231UActive Publication Date: 2025-06-27KEJIE TECH CO LTD
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Patent Information

Application Number
CN202422195345.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-06
Publication Date
2025-06-27
Estimated Expiration
2034-09-06

AI Technical Summary

Technical Problem

After the machine tool is assembled, when the sample is processed and tested directly by using the machine tool, cutting fluid and other substances are likely to contaminate the machine tool and the fuel tank, resulting in cumbersome cleaning work and increasing the labor intensity of the staff.

Method used

Design a machine tool trial processing device, including a bearing assembly, a trial processing box and a connecting assembly. The cutting fluid is introduced into the cavity through the through holes on the loading box, and the water pump extracts and recycles the cutting fluid to avoid contamination and ensures the liquid is clean through the water filter holes and filter mesh.

Benefits of technology

It effectively avoids the pollution of cutting fluid on the machine tool and fuel tank, simplifies the cleaning process, reduces the labor intensity of staff, and improves the efficiency of trial processing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The embodiment of the utility model provides a trial machining device of a machine tool, and relates to the field of metal machining machine tools. Comprising a bearing assembly, a trial processing box and a connecting assembly. The containing assembly comprises a containing box, a cavity is formed in the containing box, and a through hole is formed in the containing box and communicates with the cavity. A first connecting hole is formed in the trial processing box and is communicated with the outside; the trial processing box is detachably connected with the containing box; the connecting assembly is arranged in the containing box and comprises a guide box and a water pump, and the guide box and the water pump are both located on one side of the trial processing box. Wherein the water pump extends into the cavity, a water filtering hole is formed in the bottom wall of the guide box and communicated to the cavity, and a second connecting hole is formed in the guide box and communicated with the outside. The device is simple in structure and convenient to transport, after trial machining is completed, the whole device can be moved to the next machine tool needing trial machining, workers can clean the machine tool easily and rapidly, the working intensity of the workers is reduced, and efficiency is improved.
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Description

Technical Field

[0001] The utility model relates to the field of metal processing machine tools, and particularly relates to a machine tool trial processing device. Background Art

[0002] A machine tool refers to a machine that manufactures machines and machinery. Machine tools play a major role in the construction of national economic modernization. Although there are many methods for machining mechanical parts in modern mechanical manufacturing, for parts with relatively high precision requirements and relatively fine surface roughness requirements, they all need to be finally processed by cutting methods on machine tools. With the development of China's heavy industry, the processing precision requirements for large mechanical processing equipment such as machine tools are getting higher and higher. Therefore, after the machine tool is assembled, it is necessary to test the actual processing performance and processing precision of the machine tool.

[0003] In the related art, after the machine tool is assembled, the machine tool is directly used to process samples for testing whether the actual processing performance of the machine tool meets the requirements for leaving the factory. However, substances such as cutting fluid required during the process of the machine tool processing samples are bound to pollute the machine tool and the fuel tank, resulting in a very cumbersome cleaning work for the machine tool after the processing test is completed, increasing the labor intensity of the staff.

[0004] In view of the above problems, there is an urgent need for a machine tool trial processing device in the market, so that when the staff operates the machine tool to process samples for testing, it can be detected whether the actual processing performance of the machine tool meets the requirements for leaving the factory on the premise of not polluting the machine tool. Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a machine tool trial processing device, which can avoid substances such as cutting fluid from polluting the machine tool and the fuel tank when the machine tool is assembled and samples are processed for testing, aiming to reduce the labor intensity of the staff. The specific technical solutions are as follows.

[0006] According to the machine tool trial processing device provided by the embodiment of the utility model, it includes a loading component, a trial processing box and a connecting component.

[0007] The loading component includes a loading box, the interior of the loading box has a cavity, and a through hole is opened on the loading box, and the through hole communicates with the cavity; a first connecting hole is opened on the trial processing box, and the first connecting hole communicates with the outside; the trial processing box is detachably connected to the loading box; the connecting component is arranged on the loading box, and the connecting component includes a guiding box and a water pump, and both the guiding box and the water pump are located on one side of the trial processing box.

[0008] Wherein, the water pump extends into the cavity, a water filtering hole is opened on the bottom wall of the guiding box, the water filtering hole communicates with the cavity, and a second connecting hole is opened on the guiding box, and the second connecting hole communicates with the outside.

[0009] According to the machine tool trial processing device provided by the embodiment of the present utility model, the trial processing box includes a bottom plate and a plurality of fixing plates. The plurality of fixing plates enclose to form a storage tank, and the bottoms of the fixing plates are all connected to the bottom plate. The bottom plate is detachably connected to the loading box.

[0010] According to the machine tool trial processing device provided by the embodiment of the present utility model, a first connection hole is opened on the fixing plate, and the first connection hole communicates the storage tank with the outside.

[0011] According to the machine tool trial processing device provided by the embodiment of the present utility model, the trial processing box includes a plurality of folding plates and telescopic rods. The folding plates are connected to the fixing plates, and the fixing plates and the folding plates correspond one by one. The plurality of folding plates enclose, and one end of the telescopic rod is connected to the bottom plate and the other end is connected to the folding plate.

[0012] According to the machine tool trial processing device provided by the embodiment of the present utility model, a flow channel is opened inside the bottom plate, and a third connection hole and a fourth connection hole are opened on the side wall of the bottom plate. Both the third connection hole and the fourth connection hole communicate with the outside, and the third connection hole, the fourth connection hole and the flow channel communicate with each other.

[0013] According to the machine tool trial processing device provided by the embodiment of the present utility model, a liquid outlet hole is opened on the bottom plate, and the liquid outlet hole communicates the storage tank with the outside.

[0014] According to the machine tool trial processing device provided by the embodiment of the present utility model, the connection assembly further includes a filter screen, and the filter screen is arranged inside the guiding box.

[0015] According to the machine tool trial processing device provided by the embodiment of the present utility model, the loading assembly further includes universal wheels. There are a plurality of universal wheels, and the universal wheels are all fixed on the loading box.

[0016] The beneficial effects of this technical solution:

[0017] The machine tool trial processing device provided by the embodiment of the present utility model has a simple structure and is convenient for transportation. After the trial processing is completed, the entire device can be moved to the next machine tool that needs to be trial processed, improving efficiency. It is convenient for the staff to transfer in the work site, so that multiple machine tools can take turns to carry out processing tests, and it can also avoid substances such as cutting fluid used in the test process from polluting the machine tool and the fuel tank, making it easy and rapid for the staff to clean the machine tool, reducing the work intensity of the staff. Its beneficial effects are specifically reflected in the following aspects.

[0018] A through hole is opened on the loading box, and the through hole communicates with the cavity. The cutting fluid is transported into the cavity through the through hole, and then the through hole is sealed. The cutting fluid can be stored in the cavity. The sample to be machined is placed in the trial machining box. The telescopic rod can drive the folding plate to rise or fall. The folding plate and the fixed plate enclose the storage groove, preventing the cutting chips and cutting fluid from splashing during machining. The height of the folding plate can be adjusted by changing the length of the telescopic rod to adapt to the size of the sample, making this device applicable to various types of cutting machine tools.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of the machine tool trial machining device provided by the embodiment of the present utility model;

[0022] Figure 2 Side view structural schematic diagram of the machine tool trial machining device provided by the embodiment of the present utility model;

[0023] Figure 3 Front view structural schematic diagram of the machine tool trial machining device provided by the embodiment of the present utility model;

[0024] Figure 4 For Figure 1 Cross-sectional view;

[0025] Figure 5 Structural schematic diagram of the trial machining box in the machine tool trial machining device provided by the embodiment of the present utility model;

[0026] Figure 6 Structural schematic diagram of the trial machining box in the machine tool trial machining device provided by the embodiment of the present utility model from another angle;

[0027] Figure 7 Top view structural schematic diagram of the trial machining box in the machine tool trial machining device provided by the embodiment of the present utility model;

[0028] Figure 8 Bottom view structural schematic diagram of the trial machining box in the machine tool trial machining device provided by the embodiment of the present utility model;

[0029] Figure 9Perspective view of the bottom plate in the machine tool trial processing device provided by the embodiment of the present utility model;

[0030] Figure 10 Structural schematic diagram of the guide box in the machine tool trial processing device provided by the embodiment of the present utility model.

[0031] Reference numerals

[0032] Carrying assembly 100; Carrying box 110; Cavity 111; Through hole 112; Universal wheel 120; Handle 130;

[0033] Trial processing box 200; Fixed plate 210; First connection hole 211; Connector 212; First fixing groove 213; Storage tank 214; Bottom plate 220; Flow channel 221; Third connection hole 222; Fourth connection hole 223; Coolant connector 224; Second fixing groove 225; Liquid outlet hole 226; Threaded hole 227; Folding plate 230; Telescopic rod 240;

[0034] Connection assembly 300; Guide box 310; Water filtering hole 311; Second connection hole 312; Filter net 320; Water pump 330. Detailed implementation manners

[0035] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, left, right, front, back, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0037] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0038] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0039] An embodiment of the present utility model provides a trial machining device for a machine tool, which includes a loading assembly 100, a trial machining box 200, and a connection assembly 300.

[0040] Reference Figures 1 to 4 , the loading assembly 100 includes a loading box 110, the interior of the loading box 110 has a cavity 111, and a through hole 112 is opened on the loading box 110, and the through hole 112 communicates with the cavity 111; a first connection hole is opened on the trial machining box 200, and the first connection hole communicates with the outside; the trial machining box 200 is detachably connected to the loading box 110; the connection assembly 300 is arranged on the loading box 110, and the connection assembly 300 includes a guide box 310 and a water pump 330, and both the guide box 310 and the water pump 330 are located on one side of the trial machining box 200.

[0041] Wherein, the water pump 330 extends into the cavity 111, a water filtering hole 311 is opened on the bottom wall of the guide box 310, the water filtering hole 311 communicates with the cavity 111, and a second connection hole 312 is opened on the guide box 310, and the second connection hole 312 communicates with the outside.

[0042] It should be understood that the trial machining box 200 is detachably connected to the loading box 110. When a trial machining experiment needs to be carried out on the machine tool, the trial machining box 200 is fixed to the loading box 110, and the entire trial machining device for the machine tool is fixed to the machine tool workbench. Then, pipelines are used to connect the first connection hole and the second connection hole 312, so that the cutting fluid in the trial machining box 200 can flow into the guide box 310. The water filtering hole 311 is opened on the bottom wall of the guide box 310, and the cutting fluid in the guide box 310 can flow into the cavity 111. The water pump 330 can extract the cutting fluid in the cavity 111. At the same time, the water pump 330 is connected to the workpiece cooling pipeline of the machine tool, and the cutting fluid is sprayed onto the sample to be trial machined. In cooperation with the cutting process, the position of the sample is located in the trial machining box 200 to avoid the splashing of cutting chips and cutting fluid during machining, and at the same time, the cutting fluid is stored in the trial machining box 200. A through hole 112 is opened on the loading box 110, and the through hole 112 communicates with the cavity 111. An appropriate amount of cutting fluid can be added into the cavity 111 through the through hole 112 and then the through hole 112 is closed, so that the water pump 330 can extract the cutting fluid from the cavity 111. At the same time, the cutting fluid in the cavity 111 can also be discharged through the through hole 112.

[0043] Reference Figure 4, In summary, through the cooperation among the loading component 100, the trial processing box 200, and the connection component 300, a circulating loop of cutting fluid is formed between the trial processing device of this machine tool and the machine tool. The specific circulating mode is as follows: The cavity 111 inside the loading box 110 is used to store cutting fluid. The water pump 330 pumps the cutting fluid in the cavity 111 to the workpiece cooling pipeline of the machine tool and sprays the cutting fluid onto the sample. The sample is placed in the trial processing box 200, and the cutting fluid can be stored in the trial processing box 200. Finally, the cutting fluid flows into the guiding box 310 through the first connection hole and the second connection hole 312 connected by a pipeline. Through the water filtering holes 311 on the bottom wall of the guiding box 310, the cutting fluid flows back into the cavity 111, thus realizing the recycling of the cutting fluid. At the same time, it reduces the pollution of the machine tool by debris and cutting fluid generated during the trial processing, speeds up the trial processing efficiency, and reduces the labor cost.

[0044] As an additional embodiment of the present utility model, a plurality of second connection holes 312 are provided on different side walls of the guiding box 310 to facilitate the staff to connect the pipelines. During use, if one of the second connection holes 312 on the side wall of the guiding box 310 is selected, the connection holes on the remaining side walls can be closed.

[0045] Meanwhile, the trial processing box 200 is detachably connected to the loading box 110. When a trial processing experiment on the machine tool is needed, the trial processing box 200 is fixed on the loading box 110. When the trial processing box 200 needs to be cleaned, the trial processing box 200 can be disassembled, which is very convenient to use.

[0046] Reference Figures 5 to 9 , According to the machine tool trial processing device provided by the embodiment of the present utility model, the trial processing box 200 includes a bottom plate 220 and a plurality of fixing plates 210. The plurality of fixing plates 210 enclose to form a storage groove 214, and the bottoms of the fixing plates 210 are all connected to the bottom plate 220. The bottom plate 220 is detachably connected to the loading box 110.

[0047] It should be noted that during the trial processing experiment, the sample needs to be fixed on the bottom plate 220. Therefore, a plurality of threaded holes 227 are provided on the top wall of the bottom plate 220 for fixing the sample, and the threaded holes 227 do not penetrate the bottom plate 220. In order to facilitate the staff to operate when fixing the sample using the threaded holes 227, the fixing plate 210 is detachably connected to the bottom plate 220, so that the fixing plate 210 will not interfere with the operation when the staff fixes the sample. After the sample is fixed, the fixing plate 210 is fixed to the bottom plate 220 so that the storage groove 214 can store the cutting fluid, and it is also necessary to ensure the firm fixing effect between the fixing plate 210 and the bottom plate 220 to prevent the cutting fluid from leaking from the connection between the two.

[0048] Therefore, as an example, there are four fixing plates 210. The fixing plates 210 enclose to form a storage tank 214, and the bottom ends of the fixing plates 210 are all threadedly connected to the bottom plate 220. Moreover, first fixing grooves 213 are provided at the bottom ends of the fixing plates 210, and second fixing grooves 225 corresponding to the first fixing grooves 213 are provided on the bottom plate 220. When the fixing plates 210 are firmly threadedly connected to the bottom plate 220, the first fixing grooves 213 and the second fixing grooves 225 are aligned one by one. During use, a pressing block can be used to embed into the first fixing grooves 213 and the second fixing grooves 225. Under the pressure action of the threaded connection and the pressing block, the connection between the bottom plate 220 and the fixing plates 210 is further stabilized, so that the cutting fluid in the storage tank 214 will not leak out.

[0049] According to the machine tool trial processing device provided by the embodiment of the present invention, a first connection hole is provided on the fixing plate 210, and the first connection hole communicates the storage tank 214 with the outside.

[0050] The first connection hole is provided on one of the fixing plates 210 closest to the guiding box 310. The first connection hole is provided on the side wall of the fixing plate 210 and at the bottom of the fixing plate 210, so that the cutting fluid can be discharged from the storage tank 214 quickly and conveniently.

[0051] Reference Figures 5 to 7 Referring to

[0052] According to the machine tool trial processing device provided by the embodiment of the present invention, the trial processing box 200 includes a plurality of folding plates 230 and telescopic rods 240. The folding plates 230 are connected to the fixing plates 210, and the fixing plates 210 and the folding plates 230 correspond one by one. The plurality of folding plates 230 enclose. One end of the telescopic rod 240 is connected to the bottom plate 220, and the other end is connected to the folding plate 230.

[0053] Reference Figures 7 to 9, according to the machine tool trial processing device provided by the embodiment of the present utility model, a flow channel 221 is opened inside the bottom plate 220, and a third connection hole 222 and a fourth connection hole 223 are opened on the side wall of the bottom plate 220. Both the third connection hole 222 and the fourth connection hole 223 communicate with the outside, and the third connection hole 222, the fourth connection hole 223 and the flow channel 221 communicate with each other.

[0054] It should be noted that a flow channel 221 is opened inside the bottom plate 220. The flow channel 221 is used for the circulation of the coolant. The third connection hole 222 and the fourth connection hole 223 communicate the flow channel 221 with the outside. Coolant connectors 224 are arranged in both the third connection hole 222 and the fourth connection hole 223. One of the third connection hole 222 and the fourth connection hole 223 can be used as the inlet for the coolant to flow into the flow channel 221, and the other is used as the outlet for the coolant to flow out of the flow channel 221. The flow and circulation of the coolant in the flow channel 221 are realized through the coolant connectors 224.

[0055] As an additional embodiment of the present utility model, some samples have special processing techniques during processing and require cutting immersion processing, but there is currently a lack of dedicated immersion processing fixtures.

[0056] In this embodiment, the trial processing box 200 can be used as an immersion processing fixture. When the sample needs to be processed by immersion, the sample is fixed to the bottom plate 220, and the immersion liquid is conveyed to the storage tank 214. The volume of the storage tank 214 can be flexibly changed by adjusting the length of the telescopic rod 240 so that there is a sufficient amount of immersion liquid in the storage tank 214. At the same time, the coolant flows through the flow channel 221 to control the temperature of the immersion liquid and improve the processing accuracy. When the immersion liquid needs to be replaced, only the liquid outlet hole 226 needs to be opened, and the immersion liquid will flow out of the storage tank 214.

[0057] Reference Figure 9 , according to the machine tool trial processing device provided by the embodiment of the present utility model, a liquid outlet hole 226 is opened on the bottom plate 220, and the liquid outlet hole 226 communicates the storage tank 214 with the outside.

[0058] It should be noted that after a small part of the cutting fluid in the storage tank 214 flows out through the first connection hole, a small part of the cutting fluid will still remain in the storage tank 214. The bottom plate 220 is arranged at the bottom end of the fixing plate 210, and the liquid outlet hole 226 communicates the storage tank 214 with the outside, which facilitates the staff to completely drain the cutting fluid in the storage tank 214, empty the storage tank 214, and reduces the time for the staff to replace the cutting fluid and clean the trial processing box 200.

[0059] At the positions of the first connection hole, the second connection hole 312 and the liquid outlet hole 226, connection heads 212 adapted to their apertures are correspondingly provided, which are used to facilitate the connection of pipelines by the staff during use, so as to realize the circulation that the cutting fluid flows from the cavity 111 into the trial processing box 200, then flows through the guiding box 310, and finally flows into the cavity 111.

[0060] Reference Figure 4 and Figure 10 , according to the machine tool trial processing device provided by the embodiment of the present invention, the connection assembly 300 further includes a filter screen 320, and the filter screen 320 is arranged inside the guiding box 310.

[0061] The water pump 330 extracts the cutting fluid in the cavity 111 to the workpiece cooling pipeline of the machine tool and sprays the cutting fluid onto the sample, so that the storage tank 214 can store the cutting fluid. After the cutting fluid is used, there will inevitably be pollution and impurities. And the cutting fluid in the cavity 111 needs to be clean and free of impurities. Therefore, the used cutting fluid in the guiding box 310 cannot directly enter the cavity 111 through the water filtering holes 311, but flows into the cavity 111 through the filter screen 320 after filtering out impurities through the water filtering holes 311, so that the cutting fluid in the cavity 111 is all clean and impurity-free cutting fluid, which is beneficial to the accuracy of the trial processing experiment results and at the same time ensures that the cutting fluid used during the trial processing experiment is all impurity-free.

[0062] Reference Figure 1 and Figure 2 , according to the machine tool trial processing device provided by the embodiment of the present invention, the loading and unloading assembly 100 further includes universal wheels 120, there are multiple universal wheels 120, and the universal wheels 120 are all fixed to the loading and unloading box 110.

[0063] The universal wheels 120 can facilitate the staff to push the loading and unloading box 110. At the same time, a handle 130 is also arranged on the loading and unloading box 110 to realize the transfer of the whole device in the working site.

[0064] The above are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A machine tool trial processing device, characterized in that: include: A receiving assembly (100), the receiving assembly (100) comprising a receiving box (110), the receiving box (110) having a cavity (111) inside, and a through hole (112) provided on the receiving box (110), the through hole (112) being connected to the cavity (111); A trial processing box (200), wherein a first connection hole (211) is provided on the trial processing box (200), and the first connection hole (211) is connected to the outside; the trial processing box (200) is detachably connected to the receiving box (110); A connection assembly (300), the connection assembly (300) being arranged on the receiving box (110), the connection assembly (300) comprising a guide box (310) and a water pump (330), the guide box (310) and the water pump (330) both being located on one side of the trial processing box (200); The water pump (330) extends into the cavity (111), a water filter hole (311) is provided on the bottom wall of the guide box (310), the water filter hole (311) is connected to the cavity (111), and the guide box (310) is provided with a second connection hole (312), the second connection hole (312) is connected to the outside.

2. A machine tool trial processing device according to claim 1, characterized in that: The trial processing box (200) comprises a bottom plate (220) and a plurality of fixed plates (210), wherein the plurality of fixed plates (210) enclose a storage slot (214), and the bottoms of the fixed plates (210) are all connected to the bottom plate (220), and the bottom plate (220) is detachably connected to the containing box (110).

3. A machine tool trial processing device according to claim 2, characterized in that: The fixing plate (210) is provided with a first connection hole (211), and the first connection hole (211) is connected with the storage tank (214) and the outside.

4. A machine tool trial processing device according to claim 2, characterized in that: The trial processing box (200) comprises a plurality of folding plates (230) and a telescopic rod (240), wherein the folding plates (230) are connected to the fixed plates (210), and the fixed plates (210) correspond to the folding plates (230) one by one, and the plurality of folding plates (230) are enclosed, and one end of the telescopic rod (240) is connected to the bottom plate (220), and the other end is connected to the folding plates (230).

5. A machine tool trial processing device according to claim 4, characterized in that: A flow channel (221) is provided inside the bottom plate (220), and a third connection hole (222) and a fourth connection hole (223) are provided on the side wall of the bottom plate (220); the third connection hole (222) and the fourth connection hole (223) are both connected to the outside, and the third connection hole (222), the fourth connection hole (223) and the flow channel (221) are connected to each other.

6. A machine tool trial processing device according to claim 5, characterized in that: The bottom plate (220) is provided with a liquid outlet hole (226), and the liquid outlet hole (226) is connected with the storage tank (214) and the outside.

7. A machine tool trial processing device according to claim 1, characterized in that: The connection assembly (300) further comprises a filter screen (320), wherein the filter screen (320) is arranged inside the guide box (310).

8. The machine tool trial processing device according to claim 1, characterized in that: The receiving assembly (100) further comprises a universal wheel (120), the universal wheel (120) comprises a plurality of universal wheels (120), and the universal wheels (120) are all fixed to the receiving box (110).