Disk brake piston housing split integrated testing device

Abstract

The utility model relates to a disc brake piston shell split type comprehensive detection device, including main body and can dismantle the connection on the upper layer of auxiliary body of main body, be equipped with work piece between main body and auxiliary body, the lower surface of main body is provided with at least three datum positioning column, the datum positioning column upper surface is datum plane, the lower layer of auxiliary body, main body respectively is provided with a plurality of detection components for detecting each position of work piece. The utility model simple structure, reasonable in design, convenient to use, adopt split structure design, solved the problem that integral detection device cannot assemble because of shell structure complex, positioning is accurate, and dismounting is convenient, and the part of auxiliary detection device can be fixed quickly, realizes quick detection, the detection project is complete, is suitable for size, position degree, interference and multiple detection needs, improves detection efficiency and precision, reduces artificial judgment error, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to a split-type integrated testing device for the piston housing of a disc brake. Background Technology

[0002] With increasing demands for precision and stability in automotive braking systems, the machining accuracy of disc brake piston housings directly impacts overall vehicle braking performance. To ensure product quality, efficient and accurate inspection of critical dimensions, positional accuracy, and assembly interference of the piston housing is necessary during machining. Therefore, a comprehensive inspection fixture structure with a rational design, easy disassembly and assembly, and capable of rapid inspection of multiple dimensions and positional accuracy is designed to facilitate efficient inspection of various workpiece positions. Utility Model Content

[0003] This invention addresses the aforementioned problem by providing a separate integrated testing device for the piston housing of a disc brake, which is convenient and efficient to use.

[0004] This utility model is constructed as follows: it includes a main inspection fixture and a secondary inspection fixture detachably connected to the upper layer of the main inspection fixture. A workpiece is provided between the main inspection fixture and the secondary inspection fixture. At least three reference positioning posts are provided on the lower surface of the main inspection fixture, and the upper surface of the reference positioning posts is a reference surface. Multiple detection components for detecting various positions of the workpiece are respectively provided on the lower layers of the secondary inspection fixture and the main inspection fixture.

[0005] Furthermore, the main body fixture has a top plate on its upper layer, and the auxiliary body fixture is connected to the top plate by two auxiliary body fixture positioning pins and two locking screws. The top plate is also provided with a quick clamping mechanism for pressing down the rear of the auxiliary body fixture.

[0006] Furthermore, the multiple detection components located on the main inspection fixture include four first detection components, four second detection components, two seventh detection components, and two interference detection components. The first detection components, second detection components, seventh detection components, and interference components correspond to different detection positions on the workpiece.

[0007] Furthermore, the first detection component includes a first detection base disposed on the lower layer of the main detection unit, a first detection column penetrating the first detection base is disposed inside the first detection base, a first detection head is disposed above the first detection column, a first operating handle is disposed at the lower end of the first detection column, and a first limiting member is disposed outside the first detection base, the first limiting member penetrating the first detection base and limiting the first detection column.

[0008] Furthermore, the second detection component includes a second detection base disposed on the lower layer of the main detection unit, a second detection column penetrating the second detection base is disposed inside the second detection base, a second detection head is disposed above the second detection column, a second operating handle is disposed at the lower end of the second detection column, and a second limiting member is disposed outside the second detection base, the second limiting member penetrating the second detection base and limiting the second detection column.

[0009] Furthermore, the interference assembly includes an interference base installed on the lower layer of the main inspection unit, an interference detection column passing through the interference base, an arc-shaped detection block at the upper end of the interference detection column, an interference operation handle at the lower end of the interference detection column, and an interference limiting member outside the interference base, which penetrates the interference base and limits the interference detection column inside.

[0010] Furthermore, the seventh detection component is correspondingly set at the position of the main body positioning pin. The seventh detection component includes a seventh operating handle, a double frustum and a seventh detection head arranged sequentially from top to bottom. The main body positioning pin is respectively set on the side of the two reference positioning columns in front. The seventh detection head is correspondingly inserted into the positioning hole set at the upper end of the main body positioning pin.

[0011] Furthermore, the multiple detection components located on the auxiliary body inspection fixture include two third detection components, two fourth detection components, one fifth detection component, and one sixth detection component. The third, fourth, fifth, and sixth detection components correspond to different detection positions on the workpiece.

[0012] Furthermore, the third detection component includes a third detection base disposed on the auxiliary inspection fixture, a third detection column penetrating the third detection base is disposed within the third detection base, a third detection head is disposed below the third detection column, the diameter of the third detection head is smaller than that of the third detection column, a third operating handle is disposed at the upper end of the third detection column, and a third limiting member is disposed outside the third detection base, the third limiting member penetrating the third detection base and limiting the third detection column; the fourth detection component includes a fourth detection base disposed on the auxiliary inspection fixture, a fourth detection column penetrating the fourth detection base is disposed within the fourth detection base, a fourth detection head is disposed below the fourth detection column, the diameter of the fourth detection head is larger than that of the fourth detection column, a fourth operating handle is disposed at the upper end of the fourth detection column, and a fourth limiting member is disposed outside the fourth detection base, the fourth limiting member penetrating the fourth detection base and limiting the fourth detection column; the fifth detection component includes components disposed on the auxiliary inspection fixture. The fifth detection base on the main body has a fifth detection column penetrating through it. Below the fifth detection column is a fifth circular detection head with a diameter larger than the fifth detection column. The upper end of the fifth detection column has a fifth operating handle. A fifth limiting member is located outside the fifth detection base, penetrating it and limiting the fifth detection column. The sixth detection assembly includes a sixth detection base on the auxiliary detection body. Inside the sixth detection base is a sixth detection column penetrating it. Below the sixth detection column is a sixth detection head composed of four truncated cones arranged sequentially from top to bottom, coaxially arranged with diameters decreasing sequentially from top to bottom. The upper end of the sixth detection column has a sixth operating handle. A sixth limiting member is located outside the sixth detection base, penetrating it and limiting the sixth detection column.

[0013] Furthermore, a secondary inspection fixture placement rack is provided beside the main inspection fixture. The secondary inspection fixture placement rack includes a placement plate and multiple placement legs disposed below the placement plate. A clearance groove is provided in the middle of the placement plate. First positioning groups are symmetrically arranged on the front and rear of the surface of the placement plate. Each first positioning group consists of two first L-shaped positioning plates. Second L-shaped positioning plates are symmetrically arranged on the left and right sides of the surface of the placement plate. A positioning cylinder is provided between the second L-shaped positioning plate and the adjacent first L-shaped positioning plate. A placement groove for storing the secondary inspection fixture is formed between the first L-shaped positioning plate, the second L-shaped positioning plate, the positioning cylinder, and the clearance groove. Handles of the placement rack are provided on both sides of the placement plate.

[0014] Compared with the prior art, this utility model has the following advantages: This utility model has a reasonable design and simple structure. It uses a positioning reference surface, a main positioning pin, four first detection components, four second detection components, two seventh detection components, and two interference detection components on the main body fixture to initially position the piston housing and complete the detection of interference, mounting surface flatness, and some hole positions. The top plate has mounting holes to fit the locking screws on the auxiliary body fixture. The auxiliary body fixture is installed in conjunction with the main body fixture through the positioning pin and locking screws. After installation, the two third detection components and two... The fourth, fifth, and sixth inspection components provide supplementary inspections of the remaining concealed locations, internal structures, and interference areas on the upper part of the workpiece. This device is reusable, structurally stable, and offers high inspection accuracy. It is suitable for inspecting disc brake housings and features a split-structure design, solving the problem of assembling a single inspection fixture due to the complexity of the housing structure. It offers precise positioning, easy assembly and disassembly, and the auxiliary inspection fixture can be quickly positioned and fixed for rapid inspection. It provides a complete range of inspection items, suitable for multiple inspection needs such as dimensions, positional accuracy, and interference. It improves inspection efficiency and accuracy, reduces human error, and enhances production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram illustrating the operation of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the main inspection tool and detection component structure of an embodiment of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the main inspection tool and detection component structure of an embodiment of this utility model. Figure 2 ; Figure 5 This is a partial schematic diagram of the main inspection tool and detection components according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the auxiliary body examination tool and detection component according to an embodiment of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the auxiliary body examination tool and detection component according to an embodiment of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the auxiliary inspection fixture placement rack structure according to an embodiment of this utility model; Figure 9 This is a schematic diagram of the structure of the first detection component in an embodiment of this utility model; Figure 10 This is a schematic diagram of the structure of the second detection component in an embodiment of the present invention; Figure 11This is a schematic diagram of the seventh detection component structure in this embodiment of the present invention; Figure 12 This is a schematic diagram of the interference detection component structure according to an embodiment of the present invention; Figure 13 The workpiece in the embodiment of this utility model is three-dimensional. Figure 1 ; Figure 14 The workpiece in the embodiment of this utility model is three-dimensional. Figure 2 . Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Example: Figure 1-14 As shown in this embodiment, a split-type integrated testing device for disc brake piston housing is provided, including a main inspection fixture 1 and a secondary inspection fixture 2 detachably connected to the upper layer of the main inspection fixture. A workpiece 3 is provided between the main inspection fixture and the secondary inspection fixture. At least three reference positioning posts 11 are provided on the lower surface of the main inspection fixture, and the upper surface of the reference positioning posts is a reference surface 111. Multiple detection components 4 for detecting various positions of the workpiece are respectively provided on the lower layers of the secondary inspection fixture and the main inspection fixture.

[0018] The main fixture is equipped with a positioning reference surface, a main positioning pin, four first detection components, four second detection components, two seventh detection components, and two interference detection components to initially position the piston housing (workpiece) and complete the detection of interference, flatness of the mounting surface, and some hole positions. The top plate has a mounting hole to fit the locking screw on the auxiliary fixture. The auxiliary fixture is installed with the main fixture through the positioning pin and the locking screw. After installation, the two third detection components, two fourth detection components, one fifth detection component, and one sixth detection component on the auxiliary fixture perform supplementary detection on the remaining hidden positions, internal cavity structure, and interference parts on the upper part of the workpiece.

[0019] The main and auxiliary inspection fixtures are pre-set with multiple go gauge and no-go gauge measurement points at each inspection position to achieve rapid inspection of dimensional tolerances, hole position accuracy, and structural interference.

[0020] The inspection steps are as follows: (1) The operator places the piston housing on the reference surface of the main fixture to complete the initial positioning; (2) Check the dimensions and tolerances (such as hole diameter, position, reference surface, etc.) involved in the main fixture and check the workpiece data through the inspection components on the main fixture; (3) Assemble the sub-fixture, insert the positioning pin into the corresponding hole, tighten the locking screw, and fix the sub-fixture on the upper layer of the main fixture, that is, above the workpiece; (4) Continue to check the inner cavity size, relative hole position and interference area of ​​the workpiece through the multiple inspection components on the sub-fixture; (5) After the inspection is completed, loosen the sub-fixture to facilitate the quick removal of the piston housing.

[0021] In this embodiment of the utility model, the upper layer of the main inspection fixture is provided with a top plate 12, and the lower layer of the main inspection fixture is a bottom plate 13. The lower end of the bottom plate is provided with multiple support legs 14. The auxiliary inspection fixture 2 is connected to the top plate by two auxiliary inspection fixture positioning pins 21 and two locking screws 22. The two auxiliary inspection fixture positioning pins are symmetrically arranged on the left and right, and the two locking screws are also symmetrically arranged on the left and right. The top plate is also provided with two quick clamping mechanisms 23 for pressing down the rear of the auxiliary inspection fixture. The quick clamping mechanism (quick clamp) is prior art and will not be described in detail here.

[0022] A clamping member 24 is provided below the front part of the top plate mentioned above. The clamping member is used to press the workpiece. The clamping member is driven by a quick clamping mechanism 25 provided on the top plate to press or release the upper surface of the workpiece. The quick clamping mechanism (quick clamp) is prior art and will not be described in detail here.

[0023] In this embodiment of the utility model, the multiple detection components 4 located on the main inspection fixture include four first detection components 41, four second detection components 42, two seventh detection components 43 and two interference detection components 44. The first detection components, second detection components, seventh detection components and interference components correspond to different detection positions of the workpiece.

[0024] Two first detection components are positioned between two reference positioning posts at the front, and two other first detection components are positioned on either side of a reference positioning post at the rear; two second detection components are positioned outside the two reference positioning posts at the front, and two other second detection components are positioned on either side of a reference positioning post at the rear.

[0025] In this embodiment of the present invention, the first detection component 41 includes a first detection base 411 disposed on the lower layer of the main detection unit, a first detection column 412 disposed inside the first detection base and penetrating the first detection base, the first detection column being retractable along the first detection base, a first detection head 413 disposed above the first detection column, a first operating handle 414 disposed at the lower end of the first detection column, and a first limiting member 415 disposed outside the first detection base, the first limiting member penetrating the first detection base and limiting the first detection column; the diameter of the first detection head is slightly larger than that of the first detection column.

[0026] In this embodiment of the present invention, the second detection component 42 includes a second detection base 421 disposed on the lower layer of the main detection component, a second detection column 422 disposed inside the second detection base and penetrating the second detection base, a second detection head 423 disposed above the second detection column, a second operating handle 424 disposed at the lower end of the second detection column, and a second limiting member 425 disposed outside the second detection base, the second limiting member penetrating the second detection base and limiting the second detection column; the diameter of the second detection column is smaller than that of the second detection head.

[0027] In this embodiment of the present invention, the interference component 44 includes an interference base 441 installed on the lower layer of the main inspection unit, an interference detection column 442 passing through the interference base, an arc-shaped detection block 443 at the upper end of the interference detection column, an interference operation handle 444 at the lower end of the interference detection column, and an interference limiting member 445 on the outside of the interference base, which passes through the interference base and limits the interference detection column inside it.

[0028] In this embodiment of the utility model, the seventh detection component 43 is correspondingly disposed at the position of the main body positioning pin. The seventh detection component includes a seventh operating handle 431, a double frustum body 432 and a seventh detection head 433 arranged sequentially from top to bottom. The main body positioning pin 5 is respectively disposed on the side of the two reference positioning columns in front. The seventh detection head is correspondingly inserted into the positioning hole 51 disposed at the upper end of the main body positioning pin.

[0029] In this embodiment of the present invention, the plurality of detection components 4 located on the auxiliary body inspection fixture include two third detection components 45, two fourth detection components 46, one fifth detection component 47 and one sixth detection component 48, and the third detection components, fourth detection components, fifth detection components and sixth detection components correspond to different detection positions of the workpiece.

[0030] In this embodiment of the present invention, the third detection component 45 includes a third detection base 451 disposed on the sub-detection body, a third detection column 452 disposed inside the third detection base and penetrating the third detection base, a third detection head 453 disposed below the third detection column, the diameter of the third detection head being smaller than that of the third detection column, a third operating handle 454 disposed at the upper end of the third detection column, and a third limiting member 455 disposed outside the third detection base, the third limiting member penetrating the third detection base and limiting the third detection column; The fourth detection component 46 includes a fourth detection base 461 disposed on the sub-detection body, a fourth detection column 462 disposed inside the fourth detection base and penetrating the fourth detection base, a fourth detection head 463 disposed below the fourth detection column, the diameter of the fourth detection head being larger than that of the fourth detection column, a fourth operating handle 464 disposed at the upper end of the fourth detection column, and a fourth limiting member 465 disposed outside the fourth detection base, the fourth limiting member penetrating the fourth detection base and limiting the fourth detection column; The fifth detection component 47 includes a fifth detection base 471 disposed on the sub-detection body, a fifth detection column 472 disposed inside the fifth detection base and penetrating the fifth detection base, a fifth circular detection head 473 disposed below the fifth detection column, the diameter of the fifth circular detection head being larger than that of the fifth detection column, a fifth operating handle 474 disposed at the upper end of the fifth detection column, and a fifth limiting member 475 disposed outside the fifth detection base, the fifth limiting member penetrating the fifth detection base and limiting the fifth detection column; The sixth detection component 48 includes a sixth detection base 481 disposed on the sub-detection body. A sixth detection column 482 is disposed inside the sixth detection base and penetrates through the sixth detection base. A sixth detection head 483 is disposed below the sixth detection column. The sixth detection head is composed of four truncated cones arranged sequentially from top to bottom. The four truncated cones are coaxially arranged and their diameters decrease sequentially from top to bottom. A sixth operating handle 484 is disposed at the upper end of the sixth detection column. A sixth limiting member 485 is disposed outside the sixth detection base. The sixth limiting member penetrates through the sixth detection base and limits the sixth detection column.

[0031] In an embodiment of the present utility model, a secondary inspection tool placement rack 6 is provided beside the main inspection tool. The secondary inspection tool placement rack includes a placement plate 601 and a plurality of placement legs 602 arranged below the placement plate. An avoidance groove 603 is provided in the middle of the placement plate. First positioning groups are symmetrically arranged in the front and rear on the surface of the placement plate. Each first positioning group consists of two first L-shaped positioning plates 604. Second L-shaped positioning plates 605 are symmetrically arranged on the left and right on the surface of the placement plate. A positioning cylinder 606 is provided between the second L-shaped positioning plate and the adjacent first L-shaped positioning plate. A placement groove for storing the secondary inspection tool is formed among the first L-shaped positioning plate, the second L-shaped positioning plate, the positioning cylinder and the avoidance groove. Placement rack handles 607 are provided on both sides of the placement plate.

[0032] In an embodiment of the present utility model, the above-mentioned first, second, third, fourth, fifth, and sixth limit members and the interference limit member can all be screws or bolts.

[0033] In an embodiment of the present utility model, the cross-section of the top plate is in an inverted "convex" shape, and top plate handles 15 are provided on both sides of the top plate.

[0034] For any of the technical solutions disclosed in the present utility model above, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical values with obvious technical effects or representativeness among many implementable numerical values. Since the numerical values are numerous and cannot be exhausted, the present utility model only discloses some numerical values to illustrate the technical solutions of the present utility model. Moreover, the above-listed numerical values should not constitute a limitation on the protection scope of the present utility model.

[0035] Meanwhile, for the present utility model above, if it discloses or involves components or structural members that are fixedly connected to each other, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using screws or bolts for connection), or can also be understood as: a non-detachable fixed connection (such as riveting or welding). Of course, the mutual fixed connection can also be replaced by an integral structure (such as being integrally formed by casting process) (except when it is obvious that the integral forming process cannot be adopted).

[0036] If terms such as "first" and "second" are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of differentiating components in the description. Unless otherwise stated, the above terms have no special meaning.

[0037] In addition, for any of the technical solutions disclosed in the present utility model above, the terms used to represent the positional relationship or shape, unless otherwise stated, include states or shapes that are approximate, similar or close to it.

[0038] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A split-type integrated testing device for disc brake piston housing, characterized in that, It includes a main fixture and a secondary fixture detachably connected to the upper layer of the main fixture. A workpiece is provided between the main fixture and the secondary fixture. At least three reference positioning posts are provided on the lower surface of the main fixture. The upper surface of the reference positioning posts is a reference surface. Multiple detection components for detecting various positions of the workpiece are respectively provided on the lower layers of the secondary fixture and the main fixture.

2. The disc brake piston housing split-type integrated testing device according to claim 1, characterized in that, The main body fixture has a top plate on its upper layer. The auxiliary body fixture is connected to the top plate by two auxiliary body fixture positioning pins and two locking screws. The top plate is also provided with a quick clamping mechanism to press down the rear of the auxiliary body fixture.

3. The disc brake piston housing split-type integrated testing device according to claim 1, characterized in that, The multiple detection components located on the main inspection fixture include four first detection components, four second detection components, two seventh detection components, and two interference detection components. The first detection components, second detection components, seventh detection components, and interference components correspond to different detection positions on the workpiece.

4. The disc brake piston housing split-type integrated testing device according to claim 3, characterized in that, The first detection component includes a first detection base disposed on the lower layer of the main detection unit, a first detection column penetrating the first detection base is disposed inside the first detection base, a first detection head is disposed above the first detection column, a first operating handle is disposed at the lower end of the first detection column, and a first limiting member is disposed outside the first detection base, the first limiting member penetrating the first detection base and limiting the first detection column.

5. A split-type integrated testing device for disc brake piston housing according to claim 3, characterized in that, The second detection component includes a second detection base disposed on the lower layer of the main detection unit, a second detection column penetrating the second detection base is disposed inside the second detection base, a second detection head is disposed above the second detection column, a second operating handle is disposed at the lower end of the second detection column, and a second limiting member is disposed outside the second detection base, which penetrates the second detection base and limits the second detection column.

6. The disc brake piston housing split-type integrated testing device according to claim 3, characterized in that, The interference assembly includes an interference base installed on the lower layer of the main inspection unit. An interference detection column is inserted inside the interference base. An arc-shaped detection block is provided at the upper end of the interference detection column. An interference operation handle is provided at the lower end of the interference detection column. An interference limiting member is provided outside the interference base. The interference limiting member penetrates the interference base and limits the interference detection column inside it.

7. A split-type integrated testing device for disc brake piston housing according to claim 3, characterized in that, The seventh detection component is correspondingly set at the position of the main body positioning pin. The seventh detection component includes a seventh operating handle, a double truncated cone and a seventh detection head arranged sequentially from top to bottom. The main body positioning pin is respectively set on the side of the two reference positioning columns in front. The seventh detection head is inserted into the positioning hole set on the upper end of the main body positioning pin.

8. The disc brake piston housing split-type integrated testing device according to claim 1, characterized in that, The multiple inspection components located on the auxiliary body inspection fixture include two third inspection components, two fourth inspection components, one fifth inspection component, and one sixth inspection component. The third, fourth, fifth, and sixth inspection components correspond to different inspection positions on the workpiece.

9. A split-type integrated testing device for disc brake piston housing according to claim 8, characterized in that, The third detection component includes a third detection base disposed on the auxiliary detection body, a third detection column penetrating the third detection base, a third detection head below the third detection column with a diameter smaller than the third detection column, a third operating handle at the upper end of the third detection column, and a third limiting member outside the third detection base that penetrates the third detection base and limits the third detection column; the fourth detection component includes a fourth detection base disposed on the auxiliary detection body, a fourth detection column penetrating the fourth detection base, a fourth detection head below the fourth detection column with a diameter larger than the fourth detection column, a fourth operating handle at the upper end of the fourth detection column, and a fourth limiting member outside the fourth detection base that penetrates the fourth detection base and limits the fourth detection column; the fifth detection component includes components disposed on the auxiliary detection body. The fifth detection base includes a fifth detection column penetrating the fifth detection base, a fifth circular detection head below the fifth detection column with a diameter larger than the fifth detection column, a fifth operating handle at the upper end of the fifth detection column, and a fifth limiting member outside the fifth detection base that penetrates the fifth detection base and limits the fifth detection column. The sixth detection assembly includes a sixth detection base mounted on the auxiliary detection body, a sixth detection column penetrating the sixth detection base, a sixth detection head below the sixth detection column, and the sixth detection head consisting of four truncated cones arranged sequentially from top to bottom, coaxially arranged with diameters decreasing sequentially from top to bottom. The sixth detection column has a sixth operating handle at the upper end, and a sixth limiting member outside the sixth detection base that penetrates the sixth detection base and limits the sixth detection column.

10. A split-type integrated testing device for disc brake piston housing according to claim 1, characterized in that, A secondary fixture placement rack is provided beside the main fixture. The secondary fixture placement rack includes a placement plate and multiple placement legs located below the placement plate. A clearance groove is provided in the middle of the placement plate. First positioning groups are symmetrically arranged on the front and rear of the surface of the placement plate. Each first positioning group consists of two first L-shaped positioning plates. Second L-shaped positioning plates are symmetrically arranged on the left and right sides of the surface of the placement plate. A positioning cylinder is provided between the second L-shaped positioning plate and the adjacent first L-shaped positioning plate. A placement groove for storing the secondary fixture is formed between the first L-shaped positioning plate, the second L-shaped positioning plate, the positioning cylinder, and the clearance groove. Handles of the placement rack are provided on both sides of the placement plate.

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