AD acquisition module

Abstract

The utility model relates to the field of industrial automation, and provides an AD acquisition module. The AD acquisition module comprises a main control unit, an AD acquisition unit and a filter, the main control unit comprises a first input end, a second input end, a first output end and a second output end, the first input end of the main control unit is used for receiving analog signals, and the first output end is coupled with the input end of the AD acquisition unit; the output end of the AD acquisition module is coupled with the input end of the filter, and the output end of the filter is coupled with the second input end of the main control unit; the main control unit comprises a main control circuit board, the AD acquisition unit comprises an acquisition circuit board, the filter comprises a filter shell and a filter circuit board arranged in the filter shell, the outer side wall of the filter shell is provided with an installation fastener used for clamping the main control circuit board or the acquisition circuit board, and the installation fastener comprises a first clamping part and a second clamping part which are oppositely arranged. The use convenience of the filter can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial automation, and in particular to an AD acquisition module. Background Art

[0002] The acquisition circuit board usually consists of a sensor, an analog-to-digital converter, a data processor, and a communication module. The sensor is used to collect physical or chemical parameters on site, the analog-to-digital converter converts the analog signal into a digital signal, the data processor performs signal processing and data analysis, and the communication module is used to transfer the collected data to the computer for display, storage, or further processing. AD acquisition modules are widely used in industrial production, environmental monitoring, medical health, and other fields. For example, in industrial production, AD acquisition modules can be used to monitor the operating status of production equipment in real time, and to detect and handle faults in a timely manner; in environmental monitoring, AD acquisition modules can be used to collect environmental parameters such as atmosphere, water quality, and noise for environmental assessment and protection. When collecting environmental parameters through the AD acquisition module, there will be clutter and interference, which will result in inaccurate detection results; in order to reduce clutter and interference, a common processing method is to add a filter to the circuit to filter out interference signals. After adding a filter to the circuit, it is usually necessary to contact external cable ties, ropes, and other installation components to bundle the filter and fix the filter to a suitable position on the acquisition board. Additional installation components need to be prepared before installing the filter, and the convenience of using the filter needs to be improved. Utility Model Content

[0003] In order to improve the ease of use of the filter, the present application provides an AD acquisition module.

[0004] This application provides an AD acquisition module, which adopts the following technical solution:

[0005] An AD acquisition module includes: a main control unit, an AD acquisition unit, and a filter;

[0006] The main control unit comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, wherein the first input terminal of the main control unit is used to receive an analog signal, and the first output terminal is coupled to the input terminal of the AD acquisition unit; the output terminal of the AD acquisition unit is coupled to the input terminal of the filter, and the output terminal of the filter is coupled to the second input terminal of the main control unit;

[0007] The main control unit includes a main control circuit board, the AD acquisition unit includes an acquisition circuit board, the filter includes a filter housing and a filter circuit board arranged in the filter housing, and an installation fastener for clamping the main control circuit board or the acquisition circuit board is arranged on the outer wall of the filter housing, and the installation fastener includes a first clamping portion and a second clamping portion arranged opposite to each other.

[0008] By adopting the above technical solution, after the first input end of the main control unit receives the analog signal, the received analog signal is transmitted to the acquisition circuit board, the acquisition circuit board performs analog-to-digital conversion on the received analog signal, converts the analog signal into a digital signal, and transmits the converted digital signal to the filter; the filter filters the digital signal according to the set parameters, removes the interference signal, and finally transmits the filtered digital signal back to the main control unit, which further processes and analyzes the digital signal. An installation fastener is provided on the side wall of the filter housing, and the first clamping part and the second clamping part in the installation fastener cooperate with each other to clamp the main control circuit board or the acquisition circuit board, thereby realizing the installation and fixation of the filter. There is no need for the operator to prepare additional cable ties to install the filter, which improves the ease of use of the filter.

[0009] Optionally, the acquisition circuit board includes a first output pin p1, a second output pin p2, a third output pin p3, a first input pin p4, a second input pin p5, a first power pin p6 and a second power pin p7;

[0010] The filter circuit board comprises a first filter pin p8, a second filter pin p9, a fourth output pin p10, a fifth output pin p11 and a ground pin p12;

[0011] The main control circuit board includes a first power supply pin p13, a second power supply pin p14, a third input pin p15, a fourth input pin p16, a TXD interface and a GND interface;

[0012] The first output pin p1 and the second output pin p2 are coupled to the first filter pin p8 after being connected in parallel, the third output pin p3 is coupled to the second filter pin p9, the first input pin p4 is coupled to the TXD interface, the second input pin p5 is coupled to the GND interface, the first power pin p6 is coupled to the first power supply pin p13, and the second power pin p7 is coupled to the second power supply pin p14;

[0013] The fourth output pin p10 is coupled to the third input pin p15 , the fifth output pin p11 is coupled to the fourth input pin p16 , and the ground pin p12 is grounded.

[0014] Optionally, one end of the first clamping portion is fixed to the filter housing, and one end of the second clamping portion is rotatably connected to the filter housing. A first force-applying member is provided between the filter housing and the second clamping portion, and the first force-applying member is used to drive the second clamping portion to rotate in a direction close to the first clamping portion.

[0015] By adopting the above technical solution, the first clamping part is fixedly connected to the filter housing, and the second clamping part is rotatably connected to the outer wall of the filter plate. When the filter is installed on different main control circuit boards or acquisition circuit boards, the second clamping part can be rotated to adjust the distance between the first clamping part and the second clamping part to improve the applicability of the installation fastener; the setting of the first force-applying member enables the installation fastener to apply clamping force to main control circuit boards of different sizes.

[0016] Optionally, one end of the first clamping portion is fixed to the filter housing, one end of the second clamping portion is slidably connected to the filter housing, and a second force-applying member is provided between the first clamping portion and the second clamping portion, and the second force-applying member is used to drive the second clamping portion to move toward a direction close to the first clamping portion.

[0017] By adopting the above technical solution, the first clamping part is fixedly connected to the filter housing, and the second clamping part is slidably connected to the outer wall of the filter plate. When the filter is installed on different main control circuit boards or acquisition circuit boards, the second clamping part can be slid to adjust the distance between the first clamping part and the second clamping part to improve the applicability of the installation fastener. The provision of the second force-applying member enables the installation fastener to apply clamping force to main control circuit boards or acquisition circuit boards of different sizes.

[0018] Optionally, an adjustment slot is provided on the filter housing, and one end of the second clamping portion slides in the adjustment slot;

[0019] The second force applying member includes a force applying spring, one end of the force applying spring is fixedly connected to the first clamping portion, and the other end of the force applying spring is fixedly connected to the second clamping portion.

[0020] By adopting the above technical solution, one end of the second clamping part slides in the adjusting slot, thereby realizing the sliding connection of the second clamping part on the filter housing; the second force-applying member is configured as a force-applying spring, and when clamping is required, the second clamping part is slid in a direction away from the first clamping part, and the force-applying spring is in an extended state, clamping the object to be clamped between the first clamping part and the second clamping part; when clamping is completed, the second clamping part is released, the force-applying spring gradually returns to its original length, and the second clamping part moves in a direction close to the first clamping part under the action of the force-applying spring to clamp the object to be clamped.

[0021] Optionally, an anti-slip edge is provided at one end of the second clamping portion located in the adjusting slide groove, and an accommodating slide groove for the anti-slip edge to slide is provided on the inner side wall of the adjusting slide groove.

[0022] By adopting the above technical solution, the anti-dropping edge on the second clamping part is slidably arranged in the accommodating slide, and when the second clamping part slides in the adjusting slide groove, it is not easy to fall off from the adjusting slide groove.

[0023] Optionally, a storage box is fixed to one side of the filter housing, and a fixing tie is arranged in the storage box;

[0024] The fixing strap comprises a fixing strap section and binding strap sections arranged at both ends of the fixing strap section, one end of the binding strap section away from the fixing strap section passes through the storage box, and the fixing strap section is fixed in the storage box.

[0025] By adopting the above technical solution, the fixing band section of the fixing band is fixed in the storage box. When the filter needs to be fixed, the two binding band sections are pulled out of the storage box, and the ends of the two binding band sections are connected to bind the filter housing to the installation position, thereby achieving the installation and fixation of the filter. The provision of the storage box and the fixing band enables the filter to be used in different installation environments, thereby improving the applicability of the filter.

[0026] Optionally, a locking buckle is fixed to one end of one of the binding belt segments outside the storage box, and a plurality of latch teeth are arranged at intervals along the length direction of the other binding belt segment, and a locking groove for the latch teeth to engage is formed on the inner side wall of the locking buckle.

[0027] By adopting the above technical solution, when connecting the ends of two binding belt segments, the binding belt segment with the latching teeth is passed through the locking ring buckle of the other binding belt segment, and the latching teeth are latched into the locking groove, so that the connection of the two binding belt segments can be achieved, and the operation is simple.

[0028] In summary, the present application includes at least one of the following beneficial effects:

[0029] 1. In the present application, a mounting fastener is provided on the side wall of the filter housing, and the first clamping part and the second clamping part in the mounting fastener cooperate with each other to clamp the main control circuit board or the acquisition circuit board, thereby realizing the installation and fixation of the filter. The operator does not need to prepare additional cable ties to install the filter, thereby improving the ease of use of the filter;

[0030] 2. In the present application, the first clamping part is fixedly connected to the filter housing, and the second clamping part is rotatably connected to the outer wall of the filter plate. When the filter is installed on different main control circuit boards or acquisition circuit boards, the second clamping part can be rotated to adjust the distance between the first clamping part and the second clamping part to improve the applicability of the installation fastener;

[0031] 3. The filter housing of the present application is also provided with a storage box and a fixing tie. When the filter needs to be fixed, the two binding band segments are pulled out of the storage box, and the ends of the two binding band segments are connected to bind the filter housing to the installation position, thereby achieving the installation and fixation of the filter. The provision of the storage box and the fixing tie enables the filter to be used in different installation environments, thereby improving the applicability of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a signal transmission schematic diagram of an AD acquisition module in Example 1 of the present application;

[0033] Figure 2 This is a schematic diagram of the overall circuit of an AD acquisition module in Example 1 of the present application;

[0034] Figure 3 is a schematic diagram of the filter structure of Example 1 of the present application;

[0035] Figure 4 is a schematic diagram of the cross-sectional structure of the filter housing of Example 1 of the present application;

[0036] Figure 5 yes Figure 4 A schematic diagram of the local enlarged structure at point A in the middle;

[0037] Figure 6 This is a schematic diagram of the cross-sectional structure of the storage box of Example 1 of the present application.

[0038] Figure 7 is a partial enlarged structural schematic diagram of the storage box of Example 1 of the present application;

[0039] Figure 8 is a schematic diagram of a partial cross-sectional structure of a filter housing according to Embodiment 2 of the present application;

[0040] Explanation of the accompanying drawings: 1. main control unit; 11. main control circuit board; 2. AD acquisition unit; 21. acquisition circuit board; 3. filter; 31. filter housing; 311. adjustment slide groove; 3111. accommodating slide groove; 312. first mounting groove; 313. second mounting groove; 32. rotating shaft; 33. filter circuit board; 4. mounting fastener; 41. first clamping part; 42. second clamping part; 421. anti-slip edge; 43. force spring; 44. torsion spring; 5. storage box; 51. fixing splint; 6. fixing tie; 61. fixing belt segment; 62. binding belt segment; 63. locking buckle; 631. locking groove; 64. latch tooth; 65. limit strip; 7. limit ring. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-8 This application is described in further detail.

[0042] Embodiment 1:

[0043] Embodiment 1 of the present application provides an AD acquisition module.

[0044] refer to Figure 1 In order to improve the convenience of using the filter, the present application provides an AD acquisition module.

[0045] This application provides an AD acquisition module, which adopts the following technical solution:

[0046] An AD acquisition module includes a main control unit 1, an AD acquisition unit 2 and a filter 3; the main control unit 1 includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, the first input terminal is used to receive an analog signal, and the first output terminal is coupled to the input terminal of the AD acquisition unit 2; the output terminal of the AD acquisition module is coupled to the input terminal of the filter 3. The output terminal of the filter 3 is coupled to the second input terminal of the main control unit 1.

[0047] refer to Figure 2 The main control unit 1 includes a main control circuit board 11, which includes a first power supply pin p13, a second power supply pin p14, a third input pin p15, a fourth input pin p16, a TXD interface and a GND interface; wherein the third input pin p15 and the fourth input pin p16 constitute the second input end of the main control unit 1. The AD acquisition unit 2 includes an acquisition circuit board 21, which includes a first output pin p1, a second output pin p2, a third output pin p3, a first input pin p4, a second input pin p5, a first power pin p6 and a second power pin p7; wherein the first output pin p1 and the second output pin p2 constitute the output end of the AD acquisition unit 2, and the first input pin p4 and the second input pin p5 constitute the input end of the AD acquisition unit 2. The filter 3 includes a filter housing 31 and a filter circuit board 33 arranged in the filter housing 31, and the filter circuit board 33 includes a first filter pin p8, a second filter pin p9, a fourth output pin p10, a fifth output pin p11 and a ground pin p12; wherein the first filter pin p8 and the second filter pin p9 constitute the input end of the filter 3, and the fourth output pin p10 and the fifth output pin p11 constitute the output end of the filter 3.

[0048] refer to Figure 2 , the first output pin p1 and the second output pin p2 are coupled to the first filter pin p8 after being connected in parallel, the third output pin p3 is coupled to the second filter pin p9, the first input pin p4 is coupled to the TXD interface, the second input pin p5 is coupled to the GND interface, the first power pin p6 is coupled to the first power supply pin p13, and the second power pin p7 is coupled to the second power supply pin p14, so as to provide AC power to the acquisition circuit board 21. The fourth output pin p10 is coupled to the third input pin p15, the fifth output pin p11 is coupled to the fourth input pin p16, and the ground pin p12 is grounded.

[0049] refer to Figure 1 and Figure 2After the first input end of the main control unit 1 receives the analog signal, the received analog signal is transmitted to the acquisition circuit board 21. The acquisition circuit board 21 performs analog-to-digital conversion on the received analog signal, converts the analog signal into a digital signal, and transmits the converted digital signal to the filter 3; the filter 3 filters the digital signal according to the set parameters, removes the interference signal, and finally transmits the filtered digital signal back to the main control unit 1, and the main control unit 1 further processes and analyzes the digital signal.

[0050] refer to Figure 3 and Figure 4 The outer wall of the filter housing 31 is provided with a mounting fastener 4 for clamping the main control circuit board 11 or the acquisition circuit board 21. The mounting fastener 4 includes a first clamping portion 41 and a second clamping portion 42 which are arranged opposite to each other. The filter housing 31 is provided with a first mounting groove 312 and a second mounting groove 313. One end of the first clamping portion 41 is fixed to the inner bottom wall of the first mounting groove 312.

[0051] refer to Figure 4 and Figure 5 , a rotating shaft 32 is passed through one end of the second clamping portion 42, the rotating shaft 32 is fixed in the second mounting groove 313, and the second clamping portion 42 is hinged to the housing of the filter 3 through the rotating shaft 32. A first force-applying member is provided between the housing of the filter 3 and the second clamping portion 42. In this embodiment, the first force-applying member is provided as a torsion spring 44, which is sleeved on the rotating shaft 32, and one end of the torsion spring 44 abuts against the inner wall of the second mounting groove 313, and the other end of the torsion spring 44 is slidably connected to the side wall of the second clamping portion 42. In this embodiment, a limiting ring 7 is fixed on the side wall of the second clamping portion 42 away from the first clamping portion 41, and the other end of the torsion spring 44 is passed through the limiting ring 7 and slidably connected to the limiting ring 7. Second, in this embodiment, there are two mounting fasteners 4 and two torsion springs 44, and the two mounting fasteners 4 are provided on the same side.

[0052] When installing the filter 3, the second clamping portion 42 is rotated away from the first clamping portion 41, so that the first clamping portion 41 and the second clamping portion 42 cooperate with each other to clamp the main control circuit board 11, the acquisition circuit board 21 or other objects to be clamped, thereby achieving the installation and fixation of the filter 3.

[0053] refer to Figure 3 and Figure 6A storage box 5 is also fixed to one side of the filter housing 31, and a fixed tie 6 is arranged in the storage box 5; the fixed tie 6 includes a fixed band section 61 and a binding band section 62 fixedly connected to both ends of the fixed band section 61, and the ends of the two binding band sections 62 away from the fixed band section 61 are both passed through the storage box 5, and a fixed clamping plate 51 is fixed in the storage box 5, and the fixed band section 61 is clamped in the fixed clamping plate 51 to achieve fixed installation in the storage box 5. A plurality of latch teeth 64 are fixed at intervals along the length direction of a binding band section 62, and the cross section of the latch teeth 64 gradually decreases in the direction away from the fixed band section 61. In this embodiment, the latch teeth 64 are specifically set to be triangular prism-shaped.

[0054] refer to Figure 7 A locking buckle 63 is fixed to one end of the other binding band section 62 outside the storage box 5, and a locking groove 631 for the latching teeth 64 to engage is formed on the inner wall of the locking buckle 63. In the present embodiment, two locking grooves 631 are formed at intervals.

[0055] When the filter 3 needs to be installed, the two binding band segments 62 are wrapped around the components at the installation position, and then the binding band segment 62 with the latching tooth 64 is passed through the locking ring of the other binding band segment 62 and out of the locking ring, so that the latching tooth 64 is latched into the locking groove 631, and the connection between the two binding band segments 62 can be achieved, which is easy to operate.

[0056] In other embodiments, the locking ring and the latching teeth 64 may not be provided, and the two binding belt segments 62 may be connected by knotting at one end away from the fixing belt segment 61 .

[0057] refer to Figure 7 In order to facilitate the operator to extract the binding band segment 62 fixed with the latch 64, a limit strip 65 is fixed at one end of the binding band segment 62 fixed with the latch 64. The width of the limit strip 65 is greater than the width of the binding band segment 62, and the limit strip can pass through the locking buckle 63. When the binding band segment 62 slides, the limit strip 65 can abut against the filter housing 31, preventing the end of the binding band segment 62 away from the fixed band segment 61 from sliding into the filter housing 31.

[0058] The implementation principle of an AD acquisition module in the embodiment of the present application is as follows: first, the input end of the filter 3 is coupled to the output end of the AD acquisition unit 2, and the output end of the filter 3 is coupled to the second input end of the main control unit 1. Then, the second clamping portion 42 is rotated in a direction away from the first clamping portion 41, so that the first clamping portion 41 and the second clamping portion 42 cooperate with each other to clamp the main control circuit board 11, the acquisition circuit board 21 or other objects to be clamped, and the filter 3 is installed and fixed in a suitable position.

[0059] Embodiment 2:

[0060] Embodiment 2 of the present application provides an AD acquisition module.

[0061] refer to Figure 8 , the difference between Example 2 of the present application and Example 1 is that:

[0062] In this embodiment, the filter housing 31 is not provided with the first mounting groove 312 and the second mounting groove 313, and the first force-applying member is not provided. The filter housing 31 is provided with an adjustment slot 311, the first clamping portion 41 is positioned at one end of the adjustment slot 311 and is fixedly connected to the filter housing 31, and one end of the second clamping portion 42 slides in the adjustment slot 311. An anti-slip edge 421 is fixed to one end of the second clamping portion 42 located in the adjustment slot 311, and an accommodating slot 3111 is provided on the inner side wall of the adjustment slot 311, and the anti-slip edge 421 is slidably arranged in the accommodating slot 3111.

[0063] refer to Figure 8 , a second force-applying member is provided in the adjusting slide slot 311, and the second force-applying member is specifically provided as a force-applying spring 43, one end of the force-applying spring 43 is fixedly connected to the first clamping portion 41, and the other end is fixedly connected to the second clamping portion 42. When the filter 3 needs to be installed, the second clamping portion 42 is pushed to slide in a direction away from the first clamping portion 41, and the force-applying spring 43 is in an extended state, clamping the object to be clamped between the first clamping portion 41 and the second clamping portion 42; when the clamping is completed, the second clamping portion 42 is released, and the force-applying spring 43 gradually recovers its original length, and the second clamping portion 42 moves in a direction close to the first clamping portion 41 under the action of the force-applying spring 43 to clamp the object to be clamped, thereby achieving fixed installation of the filter 3.

[0064] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An AD acquisition module, characterized in that: include: A main control unit (1), an AD acquisition unit (2), and a filter (3); The main control unit (1) comprises a first input end, a second input end, a first output end and a second output end. The first input end of the main control unit (1) is used to receive an analog signal, and the first output end is coupled to the input end of the AD acquisition unit (2); the output end of the AD acquisition unit (2) is coupled to the input end of the filter (3), and the output end of the filter (3) is coupled to the second input end of the main control unit (1); The main control unit (1) comprises a main control circuit board (11), the AD acquisition unit (2) comprises an acquisition circuit board (21), the filter (3) comprises a filter housing (31) and a filter circuit board (33) arranged in the filter housing (31), and an installation fastener (4) for clamping the main control circuit board (11) or the acquisition circuit board (21) is arranged on the outer wall of the filter housing (31), and the installation fastener (4) comprises a first clamping portion (41) and a second clamping portion (42) arranged opposite to each other.

2. The AD acquisition module according to claim 1, characterized in that: The acquisition circuit board (21) comprises a first output pin p1, a second output pin p2, a third output pin p3, a first input pin p4, a second input pin p5, a first power pin p6 and a second power pin p7; The filter circuit board (33) comprises a first filter pin p8, a second filter pin p9, a fourth output pin p10, a fifth output pin p11 and a ground pin p12; The main control circuit board (11) comprises a first power supply pin p13, a second power supply pin p14, a third input pin p15, a fourth input pin p16, a TXD interface and a GND interface; The first output pin p1 and the second output pin p2 are coupled to the first filter pin p8 after being connected in parallel, the third output pin p3 is coupled to the second filter pin p9, the first input pin p4 is coupled to the TXD interface, the second input pin p5 is coupled to the GND interface, the first power pin p6 is coupled to the first power supply pin p13, and the second power pin p7 is coupled to the second power supply pin p14; The fourth output pin p10 is coupled to the third input pin p15 , the fifth output pin p11 is coupled to the fourth input pin p16 , and the ground pin p12 is grounded.

3. The AD acquisition module according to claim 1, characterized in that: One end of the first clamping portion (41) is fixed to the filter housing (31), and one end of the second clamping portion (42) is rotatably connected to the filter housing (31). A first force-applying member is provided between the filter housing (31) and the second clamping portion (42), and the first force-applying member is used to drive the second clamping portion (42) to rotate in a direction approaching the first clamping portion (41).

4. The AD acquisition module according to claim 1, characterized in that: One end of the first clamping portion (41) is fixed to the filter housing (31), and one end of the second clamping portion (42) is slidably connected to the filter housing (31). A second force-applying member is provided between the first clamping portion (41) and the second clamping portion (42), and the second force-applying member is used to drive the second clamping portion (42) to move in a direction approaching the first clamping portion (41).

5. The AD acquisition module according to claim 4, characterized in that: The filter housing (31) is provided with an adjustment slot (311), and one end of the second clamping portion (42) slides in the adjustment slot (311); The second force applying member comprises a force applying spring (43), one end of the force applying spring (43) being fixedly connected to the first clamping portion (41), and the other end of the force applying spring (43) being fixedly connected to the second clamping portion (42).

6. The AD acquisition module according to claim 5, characterized in that: An anti-slip edge (421) is provided at one end of the second clamping portion (42) located in the adjusting slide groove (311), and an accommodating slide groove (3111) for the anti-slip edge (421) to slide is provided on the inner side wall of the adjusting slide groove (311).

7. The AD acquisition module according to claim 1, characterized in that: A storage box (5) is also fixed to one side of the filter housing (31), and a fixing tie (6) is provided inside the storage box (5); The fixing strap (6) comprises a fixing strap section (61) and binding strap sections (62) arranged at both ends of the fixing strap section (61); one end of the binding strap section (62) away from the fixing strap section (61) passes through the storage box (5); and the fixing strap section (61) is fixed in the storage box (5).

8. The AD acquisition module according to claim 7, characterized in that: A locking buckle (63) is fixed to one end of one of the binding belt sections (62) located outside the storage box (5), and a plurality of latching teeth (64) are arranged at intervals along the length direction of the other binding belt section (62), and a locking groove (631) for the latching teeth (64) to be engaged is provided on the inner side wall of the locking buckle (63).

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