A fool-proof device

Abstract

The present application relates to a kind of foolproof device, including first foolproof component, it includes first connecting seat, first connecting rod and first pin shaft, the first connecting seat is equipped with first through-hole, the first through-hole is along second direction arrangement, the second direction is perpendicular to the first direction;The first connecting rod is movably connected to the first connecting seat along the first direction, first connecting rod matches the first hole;The side of first connecting rod is along radial and is equipped with first clamping groove;Second foolproof component, including second connecting seat, movable rod component and second pin shaft, second connecting seat is equipped with second through-hole, second through-hole is along second direction arrangement, movable rod component includes second connecting rod and connecting sleeve;Connecting sleeve matches first hole.Utilize the foolproof device of the present application, it can effectively distinguish the two horizontal rods, i.e. first horizontal rod and second horizontal rod, similar in appearance on frame body, to ensure the accuracy when subsequent assembly, while improving the qualified rate of product, it can also effectively improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of hole-proofing technology, and in particular to a hole-proofing device. Background Technology

[0002] During the production and processing of the oven rack, the rack body needs to be processed. Specifically, the rack body has two crossbars, which are identical in shape and size. The only difference is the shape of the holes at the ends of the two crossbars. During assembly, it is necessary to ensure that the crossbars are installed in the correct position, that is, to effectively distinguish between the two crossbars.

[0003] However, because the holes on the two crossbars are similar in shape and size, workers are prone to assembling the frame incorrectly, which affects the processing of subsequent products, reduces the pass rate, and requires rework, thus reducing production efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a mistake-proof device that can distinguish between two crossbars during the assembly process, thereby ensuring the accuracy of subsequent assembly, improving the product qualification rate, and effectively improving production efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a mistake-proofing device for preventing errors during frame processing. The frame includes a first crossbar and a second crossbar arranged along a first direction. One end of the first crossbar has a first hole; one end of the second crossbar has a second hole. The projected area of ​​the first hole is larger than the projected area of ​​the second hole. The mistake-proofing device includes... The first foolproof component includes a first connecting seat, a first connecting rod, and a first pin. The first connecting seat has a first through hole, which is arranged along a second direction perpendicular to the first direction. The first connecting rod is movably connected to the first connecting seat along the first direction and matches the first hole. One side of the first connecting rod has a first slot along the radial direction. When the first slot and the first through hole overlap in the second direction, the first pin engages with the first slot through the first through hole. The second foolproof component includes a second connecting seat, a movable rod assembly, and a second pin. The second connecting seat has a second through hole arranged along the second direction. The movable rod assembly includes a second connecting rod and a connecting sleeve. The connecting sleeve is movably fitted onto the second connecting rod, and the second connecting rod matches the second hole. The connecting sleeve matches the first hole. The second connecting rod has a second slot, and the connecting sleeve has a third slot. When the second slot and the third slot overlap, the second pin engages with the second slot through the second through hole.

[0006] In one embodiment of the present invention, the projection of the first hole along the axial direction is elliptical, and the projection of the second hole along the axial direction is circular.

[0007] In one embodiment of the present invention, the first connecting seat is further provided with a third through hole, the third through hole is arranged along the first direction, the first connecting rod is movably disposed in the third through hole, and when the first pin is engaged with the first slot, the end of the first connecting rod is received in the third through hole.

[0008] In one embodiment of the present invention, the second connecting seat is further provided with a fourth through hole, the fourth through hole being arranged along the first direction, the movable rod assembly being movably disposed in the fourth through hole, and when the second pin is engaged in the second slot, the end of the second connecting rod is received in the fourth through hole.

[0009] In one embodiment of the present invention, the second anti-foolproof component further includes a connecting post, one end of the second connecting rod is recessed inward along the axial direction to form a receiving space, the second connecting rod is also provided with a fifth through hole, the fifth through hole extending along the axial direction of the second connecting rod; the connecting sleeve is provided with a sixth through hole, the sixth through hole and the fifth through hole overlapping the projection portion of the second connecting rod along the radial direction; both ends of the connecting post are respectively connected to the connecting sleeve through the sixth through hole, and the connecting post can move within the fifth through hole under the drive of the connecting sleeve.

[0010] In one embodiment of the present invention, a frame is further included; the frame body, the first error-proof component, and the second error-proof component are assembled on the frame; two sets of the first error-proof component are provided, respectively disposed at both ends of the first crossbar; two sets of the second error-proof component are provided, respectively disposed at both ends of the second crossbar.

[0011] In one embodiment of the present invention, the frame includes a first crossbeam and a second crossbeam arranged opposite to each other, and a third crossbeam and a fourth crossbeam arranged opposite to each other. The first crossbeam, the second crossbeam, the third crossbeam and the fourth crossbeam are connected end to end in sequence, and the third crossbeam and the fourth crossbeam extend along the first direction.

[0012] In one embodiment of the present invention, a first extension rod and a second extension rod are further included. The first extension rod is connected to the first connecting rod and can move synchronously with the first connecting rod. The second extension rod is connected to the second connecting rod and can move synchronously with the second connecting rod. When the first anti-foolproof component is assembled in the first hole, the first extension rod is received in the frame. When the second anti-foolproof component is assembled in the second hole, the second extension rod is received in the frame.

[0013] In one embodiment of the present invention, the first foolproof component further includes a first mounting base, which is arranged in parallel with the first connecting base, and the first mounting base is provided with a first clearance hole to accommodate the passage of the first connecting rod.

[0014] In one embodiment of the present invention, the second foolproof component further includes a second mounting base, which is arranged in parallel with the second connecting base, and the second mounting base is provided with a second clearance hole to accommodate the passage of the second connecting rod.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: The present invention discloses a mistake-proofing device comprising a first mistake-proofing component and a second mistake-proofing component. The first mistake-proofing component is capable of matching a first hole on a first crossbar, thereby enabling effective identification of the first hole. When the first mistake-proofing component is successfully assembled at the end of the crossbar, it indicates that the crossbar is the first crossbar; otherwise, it indicates that the crossbar is the second crossbar. Correspondingly, the second mistake-proofing component is capable of matching a second hole on a second crossbar, thereby enabling effective identification of the second hole. When the second mistake-proofing component is successfully assembled at the end of the crossbar, it indicates that the crossbar is the second crossbar; otherwise, it indicates that the crossbar is the first crossbar. Using the mistake-proofing device of the present invention, two crossbars with similar shapes on a frame, namely the first crossbar and the second crossbar, can be effectively distinguished, thereby ensuring accuracy during subsequent assembly, improving product qualification rate, and effectively increasing production efficiency. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the error-proof device according to a preferred embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the frame structure according to a preferred embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the first crossbar in a preferred embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the second crossbar according to a preferred embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the first crossbar and the first anti-foolproof component in a preferred embodiment of the present invention.

[0022] Figure 6 yes Figure 5 A partial structural diagram.

[0023] Figure 7 This is a top view of the first error-proof component according to a preferred embodiment of the present invention.

[0024] Figure 8 This is a cross-sectional structural diagram of the first foolproof component according to a preferred embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram of the structure of the second crossbar and the second anti-foolproof component in a preferred embodiment of the present invention.

[0026] Figure 10 This is a first-view schematic diagram of the second foolproof component according to a preferred embodiment of the present invention.

[0027] Figure 11 This is a second-view schematic diagram of the second foolproof component according to a preferred embodiment of the present invention.

[0028] Figure 12 This is a third-view schematic diagram of the second foolproof component according to a preferred embodiment of the present invention.

[0029] Figure 13 yes Figure 12 A schematic diagram of the AA cross-section.

[0030] Figure 14 This is a fourth-view schematic diagram of the second foolproof component according to a preferred embodiment of the present invention.

[0031] Figure 15 yes Figure 14 A schematic diagram of the EE cross-section.

[0032] Explanation of reference numerals in the accompanying drawings: 1. Frame; 11. First crossbar; 110. First hole; 111. First groove; 12. Second crossbar; 120. Second hole; 121. Second groove; 13. Connecting rod; 2. First foolproof component; 20. First connecting seat; 201. First through hole; 202. Third through hole; 21. First connecting rod; 210. First slot; 22. First pin; 3. Second foolproof component; 30. Second connecting rod. 301, Second through hole; 302, Fourth through hole; 31, Second pin; 32, Second connecting rod; 321, Receiving space; 322, Fifth through hole; 33, Connecting sleeve; 330, Third slot; 331, Sixth through hole; 34, Connecting post; 35, Second mounting base; 4, Frame; 41, First crossbeam; 42, Second crossbeam; 43, Third crossbeam; 44, Fourth crossbeam; 51, First extension rod; 52, Second extension rod. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0034] Reference Figures 1 to 15 As shown, the present invention discloses a foolproof device for preventing mistakes during the processing of the frame 1.

[0035] The frame 1 includes a first crossbar 11 and a second crossbar 12 arranged along a first direction, and a connecting rod 13 connecting the first crossbar 11 and the second crossbar 12, wherein at least one connecting rod 13 is provided.

[0036] The first crossbar 11 has a first hole 110 at one end; the second crossbar 12 has second holes 120 at both ends, and the projected area of ​​the first hole 110 is larger than the projected area of ​​the second hole 120; the other end of the first crossbar 11 has a first groove 111, and the projected shape of the first hole 110 partially overlaps with the projected shape of the first groove 111; the other end of the second crossbar 12 has a second groove 121, and the projected shape of the second hole 120 partially overlaps with the projected shape of the second groove 121.

[0037] In detail, the axial direction of the first hole 110 is the same as the first direction; the axial direction of the second hole 120 is the same as the first direction.

[0038] The foolproof device includes a first foolproof component 2, which is adapted to the first hole 110.

[0039] Specifically, the first foolproof component 2 includes a first connecting seat 20, a first connecting rod 21, and a first pin 22. The first connecting seat 20 has a first through hole 201, which is arranged along a second direction perpendicular to the first direction and is a height direction. The first connecting rod 21 is movably connected to the first connecting seat 20 along the first direction, and the first connecting rod 21 matches the first hole 110, that is, the first hole 110 can accommodate the first connecting rod 21 passing through.

[0040] Furthermore, a first slot 210 is provided radially on one side of the first connecting rod 21. When the first slot 210 overlaps with the first through hole 201 in the second direction, the first pin 22 can pass through the first through hole 201 and engage with the first slot 210, and the first pin 22 can be rotated and locked. Therefore, when the above operation can be completed smoothly, it indicates that the hole is the first hole 110, and thus the corresponding first crossbar 11 can be accurately identified.

[0041] The foolproof device further includes a second foolproof component 3, and the first foolproof component 3 is adapted to the second hole 120.

[0042] Specifically, the second anti-foolproof component 3 includes a second connecting seat 30, a movable rod assembly, and a second pin 31. The second connecting seat 30 is provided with a second through hole 301, which is arranged along the second direction. The movable rod assembly includes a second connecting rod 32 and a connecting sleeve 33. The connecting sleeve 33 is movably sleeved on the second connecting rod 32. The second connecting rod 32 matches the second hole 120, that is, the second connecting rod 32 can pass through the second hole 120 exactly.

[0043] The connecting sleeve 33 matches the first hole 110; the second connecting rod 32 is provided with a second slot along the radial direction, and the connecting sleeve 33 is provided with a third slot 330. When the second slot overlaps with the third slot 330, the second pin 31 can pass through the second through hole 301 and engage with the second slot, and can be rotated and locked.

[0044] Therefore, when the above operation can be completed smoothly, it indicates that the hole is the second hole 120, and thus, the corresponding second crossbar 12 can be accurately identified.

[0045] Therefore, the error-proofing device protected by this invention includes a first error-proofing component and a second error-proofing component. The first error-proofing component can match a first hole on a first crossbar, thereby effectively identifying the first hole. When the first error-proofing component can be assembled at the end of the crossbar, it indicates that the crossbar is the first crossbar; otherwise, it indicates that the crossbar is the second crossbar. Correspondingly, the second error-proofing component can match a second hole on a second crossbar, thereby effectively identifying the second hole. When the second error-proofing component can be assembled at the end of the crossbar, it indicates that the crossbar is the second crossbar; otherwise, it indicates that the crossbar is the first crossbar. Using the error-proofing device of this invention, two crossbars with similar shapes on the frame, namely the first crossbar and the second crossbar, can be effectively distinguished, thereby ensuring the accuracy of subsequent assembly, improving the product qualification rate, and effectively improving production efficiency.

[0046] In a preferred embodiment, the projection of the first hole 110 along the axial direction is elliptical, and the projection of the second hole 120 along the axial direction is circular.

[0047] Furthermore, the first connecting seat 20 also has a third through hole 202, which is arranged along the first direction. The first connecting rod 21 is movably disposed in the third through hole 202. When the first pin 22 is engaged with the first slot 210, the end of the first connecting rod 21 is received in the third through hole 202. By designing the length of the first connecting rod 21, it can further facilitate identification. Figures 5-6 As shown, when the first anti-foolproof component 2 is assembled at one end of the first crossbar 11, since the first connecting rod 21 fits into the first hole 110, the end of the first connecting rod 21 does not exceed the size range of the first connecting seat 20 in the first direction; conversely, when the first connecting rod 21 protrudes from the third through hole 202 and from the first connecting seat 20, it indicates that the crossbar is the second crossbar 12 and not the first crossbar 11, thus facilitating quick identification and confirmation by the installer.

[0048] In detail, refer to Figures 10-15 As shown, the second connecting seat 30 is also provided with a fourth through hole 302, which is disposed through the second connecting seat 30 along the first direction; the movable rod assembly is movably disposed in the fourth through hole 302, and when the second pin 31 is engaged with the second slot, the end of the second connecting rod 32 is received in the fourth through hole 302. This arrangement can also further facilitate quick identification by the installer. When the second foolproof component 3 is assembled with the crossbar, if the end of the second connecting rod 32 can be received in the fourth through hole 302, it indicates that the crossbar is the second crossbar 12; conversely, during the installation process, if the second connecting rod 32 protrudes from the fourth through hole 302 and protrudes from the second connecting seat 30 in the first direction, it indicates that the crossbar is the first crossbar 11.

[0049] Furthermore, the second foolproof component 3 also includes a connecting post 34, the ends of which are connected to the connecting sleeve 33. One end of the second connecting rod 32 is recessed inward along the axial direction to form a receiving space 321. The second connecting rod 32 is also provided with a fifth through hole 322, which extends along the axial direction of the second connecting rod 32, that is, the fifth through hole 322 extends along the first direction.

[0050] The connecting sleeve 33 is provided with a sixth through hole 331 facing each other. The projection of the sixth through hole 331 along the radial direction of the second connecting rod 32 is a part of the projection of the fifth through hole 322 along the radial direction of the second connecting rod 32. The fifth through hole 322 and the sixth through hole 331 are both located on both sides of the receiving space 321. It should be noted that both ends of the connecting post 34 are respectively installed in the sixth through hole 331, so that the connecting post 34 is fixedly connected to the connecting sleeve 33. The connecting post 34 can move along the fifth through hole 322 under the drive of the connecting sleeve 33. The fifth through hole 322 plays a role in limiting the stroke of the connecting post 34.

[0051] Specifically, during the assembly of the second anti-foolproof component 3, the second connecting rod 32 moves along the first direction. If it corresponds to the second crossbar 12, the second connecting rod 32 can be inserted into the second hole 120. At this time, the connecting sleeve 33 abuts against the end of the second crossbar 12. Since the connecting sleeve 33 cannot be inserted into the second hole 120, the connecting sleeve 33 will move in the opposite direction to the movement direction of the second connecting rod 32. At this time, the connecting post 34 will also move along the fifth through hole 322. When it moves to the end of the stroke, the connecting post 34 abuts against the edge of the fifth through hole 322. At this time, the second slot overlaps with the third slot 330 and also overlaps with the second through hole 301 in the height direction. Thus, the second pin 31 can pass through the second through hole 301 and be inserted into the second slot and the third slot 330. The second pin 31 can be locked.

[0052] It is worth noting that the ingenious design of this device lies in the fact that, since the cross-sectional shape of the connecting sleeve 33 is adapted to the first hole 110, when the second anti-foolproof component 3 is assembled with the first hole 110, the connecting sleeve 33 will not be blocked by the first hole 110 on the first crossbar 11. Therefore, the connecting sleeve 33 and the second connecting rod 32 will always move synchronously, preventing the connecting post 34 from moving within the fifth through hole 322. Consequently, the second slot and the third slot 330 are in an overlapping state, remaining initially offset, and cannot overlap with the second through hole 301 in the height direction. Therefore, the second pin 31 cannot be inserted into the second slot through the second through hole 301. Thus, the installer can readily identify the crossbar as the first crossbar 11, and not the second crossbar 12.

[0053] In a preferred embodiment, the error prevention device further includes a frame 4, on which the frame 1, the first error prevention component 2, and the second error prevention component 3 are assembled.

[0054] In a preferred embodiment, two sets of the first anti-mistake component 2 are provided, respectively disposed at both ends of the first crossbar 11. One set of the first anti-mistake component 2 is used to cooperate with the first hole 110, and the other set of the first anti-mistake component 2 is used to cooperate with the first groove 111. The anti-mistake detection principle of the first groove 111 is the same as that of the first hole 110. Two sets of the second anti-mistake component 3 are provided, respectively disposed at both ends of the second crossbar 12. One set of the second anti-mistake component 3 is used to cooperate with the second hole 120, and the other set of the second anti-mistake component 3 is used to cooperate with the second groove 121. The anti-mistake detection principle of the second groove 121 is the same as that of the second hole 120. This arrangement facilitates the effective differentiation between the first crossbar 11 and the second crossbar 12 during subsequent operations. Furthermore, the first anti-mistake component 2 and the second anti-mistake component 3, when combined with the frame, can obtain a certain supporting force, thereby facilitating subsequent installation and processing.

[0055] Specifically, the frame includes a first crossbeam 41 and a second crossbeam 42 arranged opposite to each other, and a third crossbeam 43 and a fourth crossbeam 44 arranged opposite to each other. The first crossbeam 41, the second crossbeam 42, the third crossbeam 43 and the fourth crossbeam 44 are connected end to end in sequence, wherein the third crossbeam 43 and the fourth crossbeam 44 extend along the first direction.

[0056] To improve the error-proofing ability of installers, the error-proofing device further includes a first extension rod 51 and a second extension rod 52. The first extension rod 51 is connected to the first connecting rod 21 and can move synchronously with the first connecting rod 21; the second extension rod 52 is connected to the second connecting rod 32 and can move synchronously with the second connecting rod 32. When the first error-proofing component 2 is assembled in the first hole 110, the first extension rod 51 can be housed within the frame 4; when the second error-proofing component 3 is assembled in the second hole 120, the second extension rod 52 can be housed within the frame 4. This facilitates the operator's identification of whether the installation is accurate and whether the installation positions of the first crossbar 11 and the second crossbar 12 meet the requirements, and can improve the error-proofing efficiency to a certain extent.

[0057] In a preferred embodiment, the first foolproof component 2 further includes a first mounting base 23, which is arranged side by side with the first connecting base 20 on the frame 4. The first mounting base 23 is provided with a first clearance hole to accommodate the passage of the first connecting rod 21.

[0058] The second foolproof component 3 also includes a second mounting base 35, which is arranged side by side with the second connecting base 30 on the frame 4. The second mounting base 35 is provided with a second clearance hole to accommodate the passage of the second connecting rod 32.

[0059] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A foolproof device, characterized in that: For preventing mistakes during frame fabrication, the frame includes a first crossbar and a second crossbar arranged along a first direction. One end of the first crossbar has a first hole; one end of the second crossbar has a second hole. The projected area of ​​the first hole is larger than the projected area of ​​the second hole. The mistake-proofing device includes... The first foolproof component includes a first connecting seat, a first connecting rod, and a first pin. The first connecting seat has a first through hole, which is arranged along a second direction perpendicular to the first direction. The first connecting rod is movably connected to the first connecting seat along the first direction and matches the first hole. One side of the first connecting rod has a first slot along the radial direction. When the first slot and the first through hole overlap in the second direction, the first pin engages with the first slot through the first through hole. The second foolproof component includes a second connecting seat, a movable rod assembly, and a second pin. The second connecting seat has a second through hole arranged along the second direction. The movable rod assembly includes a second connecting rod and a connecting sleeve. The connecting sleeve is movably fitted onto the second connecting rod, and the second connecting rod matches the second hole. The connecting sleeve matches the first hole. The second connecting rod has a second slot, and the connecting sleeve has a third slot. When the second slot and the third slot overlap, the second pin engages with the second slot through the second through hole.

2. The error-proof device according to claim 1, characterized in that: The projection of the first hole along the axial direction is elliptical, and the projection of the second hole along the axial direction is circular.

3. The error-proof device according to claim 1, characterized in that: The first connecting seat is also provided with a third through hole, which is arranged along the first direction. The first connecting rod is movably disposed in the third through hole. When the first pin is engaged with the first slot, the end of the first connecting rod is received in the third through hole.

4. The error-proof device according to claim 1, characterized in that: The second connecting seat is also provided with a fourth through hole, which is arranged along the first direction. The movable rod assembly is movably disposed in the fourth through hole. When the second pin is engaged in the second slot, the end of the second connecting rod is received in the fourth through hole.

5. The error-proof device according to claim 1, characterized in that: The second foolproof component also includes a connecting post. One end of the second connecting rod is recessed inward along the axial direction to form a receiving space. The second connecting rod is also provided with a fifth through hole, which extends along the axial direction of the second connecting rod. The connecting sleeve is provided with a sixth through hole, which overlaps with the projection of the fifth through hole along the radial direction of the second connecting rod. Both ends of the connecting post are connected to the connecting sleeve through the sixth through hole. Under the drive of the connecting sleeve, the connecting post can move within the fifth through hole.

6. The error-proof device according to claim 1, characterized in that: It also includes a frame; the frame, the first error-proof component, and the second error-proof component are assembled on the frame; the first error-proof component is provided in two sets, respectively located at both ends of the first crossbar; the second error-proof component is provided in two sets, respectively located at both ends of the second crossbar.

7. The error-proof device according to claim 6, characterized in that: The frame includes a first crossbeam and a second crossbeam arranged opposite to each other, and a third crossbeam and a fourth crossbeam arranged opposite to each other. The first crossbeam, the second crossbeam, the third crossbeam and the fourth crossbeam are connected end to end in sequence, and the third crossbeam and the fourth crossbeam extend along the first direction.

8. The error-proof device according to claim 6, characterized in that: It also includes a first extension rod and a second extension rod. The first extension rod is connected to the first connecting rod and can move synchronously with the first connecting rod. The second extension rod is connected to the second connecting rod and can move synchronously with the second connecting rod. When the first anti-foolproof component is installed in the first hole, the first extension rod is housed in the frame. When the second anti-foolproof component is installed in the second hole, the second extension rod is housed in the frame.

9. The error-proof device according to claim 1, characterized in that: The first foolproof component further includes a first mounting base, which is arranged side by side with the first connecting base, and the first mounting base is provided with a first clearance hole to accommodate the passage of the first connecting rod.

10. A foolproof device according to claim 1, characterized in that: The second foolproof component also includes a second mounting base, which is arranged side by side with the second connecting base, and the second mounting base is provided with a second clearance hole to accommodate the passage of the second connecting rod.

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