PLC (Programmable Logic Controller) testing tool

Abstract

The utility model discloses a PLC controller test tool, and relates to the technical field of PLC controller test tools, the PLC controller test tool comprises a support assembly and an electrical connection assembly, and the electrical connection assembly is used for matching the positions of the input and output ends of different types of PLC controllers. According to the utility model, PLC controllers with different widths can be positioned and placed by arranging the adjustable positioning assembly, the distance between the two rows of measuring pins can be matched with the distance between the input and output ports of the PLC controllers 4 with different models through the adjustable electrical connection assembly, and the number and the position of the measuring pins can be adjusted, so that the measuring accuracy is improved. According to the utility model, by adjusting the height of the electrical connection assembly, the moving height of the probe can be matched with the PLCs with different heights under the condition that the stroke of the pneumatic push rod is kept unchanged, and the application range of the tool is effectively improved through the cooperation of the parts.

Description

A PLC controller test fixture Technical Field

[0001] This utility model relates to the field of PLC controller testing fixture technology, specifically a PLC controller testing fixture. Background Technology

[0002] A Programmable Logic Controller (PLC) is a digital electronic system specifically designed for industrial applications. It uses a programmable memory to store instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations. It controls various types of mechanical equipment or production processes through digital or analog inputs and outputs. PLC controller testing is a crucial step before the PLC controller leaves the factory. During testing, probes need to be connected to the PLC controller's input and output terminals. However, existing PLC controller input / output terminal testing fixtures have fixed probe positions; one fixture corresponds to one PLC controller model. Different PLC controller models have different input / output terminal positions, requiring different fixtures, resulting in poor fixture versatility. Therefore, this paper proposes a new PLC controller testing fixture. Summary of the Invention

[0003] The purpose of this utility model is to provide a PLC controller testing fixture in order to solve the problems mentioned above.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a PLC controller testing fixture, including a support assembly, wherein the support assembly includes an L-shaped fixture table, a linear slide, a vertical slide block, a first connecting block, a pneumatic push rod, and an adjusting bolt;

[0005] The linear slide is symmetrically opened at the top of the horizontal part of the L-shaped tooling table and completely passes through the bottom of the horizontal part. The L-shaped tooling table is equipped with a positioning component through the linear slide, and the positioning component is used to realize the positioning and placement of the PLC controller.

[0006] The vertical slide block is vertically slidably installed on the front end of the vertical part of the L-shaped tooling table via a slide rail. The first connecting block is symmetrically fixed on both sides of the vertical slide block. The pneumatic push rod is fixed to the top of the vertical part of the L-shaped tooling table. The output end of the pneumatic push rod passes through the top of the vertical part of the L-shaped tooling table and through the first connecting block. The adjusting bolt passes through the first connecting block from one side and is tightly fitted to the outer wall of the output end of the pneumatic push rod. The adjusting bolt is threadedly connected to the first connecting block to realize the connection and fixation of the first connecting block and the vertical end of the pneumatic push rod, as well as the adjustment of their relative positions.

[0007] An electrical connection component is installed at the front end of the vertical slide block. The electrical connection component is used to match the input and output terminal positions of different types of PLC controllers.

[0008] As a further embodiment of this utility model: the positioning component includes an end face stop, a first toothed arm, a first transmission gear, a side stop, and a first locking bolt;

[0009] Two end face stops are provided, and the two end face stops are distributed in parallel on the upper surface of the transverse part of the L-shaped tooling table and are limited and slidably connected to the straight slide groove.

[0010] The end face stop is fixedly connected to the first toothed arm at the bottom of the horizontal part of the L-shaped tooling table. The two first toothed arms are symmetrically distributed vertically. The first transmission gear is located between the two first toothed arms and meshes with the two first toothed arms. The first transmission gear is rotatably connected to the bottom side of the horizontal part of the L-shaped tooling table through a connecting shaft. The transmission between the first toothed arm and the first transmission gear is used to realize the synchronous and opposite movement of the two end face stops.

[0011] The side stop is fixed to one side of an end face stop. The first locking bolt is threaded to the top of the side stop and passes through the side stop to fit tightly against the upper surface of the horizontal part of the L-shaped tooling table, so as to fix the position of the end face stop.

[0012] The two end face stops are used to limit the front and rear ends of the PLC controller, and the side stop is used to position one side of the PLC controller.

[0013] As a further embodiment of this utility model: the electrical connection assembly includes a concave seat, an inverted convex slide, a snap-fit ​​groove, a snap-fit ​​seat, an arc-shaped elastic clip, a convex snap-fit ​​seat, a probe, and a wire;

[0014] The concave seat is fixed to the front end of the vertical slide, and a rectangular groove is provided at the bottom of the concave seat; two inverted convex slides are provided, and the two inverted convex slides are distributed in parallel on the inner side of the concave seat and are slidably connected to the rectangular groove.

[0015] The inner side of the inverted convex slide is formed with a "T"-shaped straight groove. The snap-fit ​​groove is symmetrically opened at the front and rear ends of the inverted convex slide and communicates with the "T"-shaped straight groove. The arc-shaped elastic clip is symmetrically formed at the front and rear ends of the snap-fit ​​seat. The snap-fit ​​seat is inserted into the upper half of the "T"-shaped straight groove, and the arc-shaped elastic clip is snapped into the snap-fit ​​groove to realize the limiting installation of the snap-fit ​​seat.

[0016] The wire and the probe are symmetrically fixed at the upper and lower ends of the convex bracket, and the probe and the wire are electrically connected to each other.

[0017] The convex bracket fits against the top of the bracket and the probe passes through the arc-shaped elastic bracket. The inverted convex slide protrudes to the bottom of the concave bracket. The probe contacts the screws in the input and output terminals of the PLC controller to realize the electrical connection between the PLC controller and the PLC tester.

[0018] As a further embodiment of this utility model: the electrical connection assembly further includes an adjustment unit, which includes a second toothed arm, a second transmission gear, a second connecting block, and a second locking bolt;

[0019] There are two second toothed arms, which are respectively fixed to one side of two inverted convex slides and are symmetrically distributed in the horizontal direction. The second transmission gear is located in the middle of the two second toothed arms and meshes with the two second toothed arms. The second transmission gear is rotatably connected to the bottom of the inner wall of the concave seat through a connecting shaft.

[0020] The second connecting block is fixed to the side of an inverted convex slide away from the second toothed arm. The second locking bolt is threaded to the top of the second connecting block and passes through the second connecting block to fit tightly against the bottom of the inner wall of the concave seat, thereby fixing the position of the inverted convex slide.

[0021] As a further improvement of this utility model: two symmetrically distributed upper baffles are fixed to the top of the inner side of the concave seat. The upper baffles are in contact with the upper surface of the inverted convex slide to achieve vertical positioning of the inverted convex slide.

[0022] One of the upper stop bars is in contact with the second locking bolt, and a straight groove is provided at the contact position for the second locking bolt to pass through and slide.

[0023] As a further embodiment of this utility model: multiple snap-fit ​​grooves are evenly arranged along the long side of the inverted convex sliding seat, the top of the arc-shaped elastic snap-fit ​​protrudes from the top of the snap-fit ​​seat, and a barb structure is formed at the contact position between the top of the arc-shaped elastic snap-fit ​​and the convex snap-fit ​​seat for snap-fitting with the outer wall of the convex snap-fit ​​seat.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] By setting an adjustable positioning component, PLC controllers of different widths can be positioned and placed. Through the adjustable electrical connection component, the spacing of the two rows of probes can be matched with the spacing of the input and output ports of different models of PLC controllers 4. The number and position of the probes can be adjusted to match the changes in the input and output ports on different models of PLC controllers. At the same time, by adjusting the height of the electrical connection component, while keeping the pneumatic push rod stroke constant, the movement height of the probes can be matched with PLC controllers of different heights. The cooperation of the above-mentioned components effectively improves the applicability of the tooling. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the structure of this utility model;

[0027] Figure 2 is a structural schematic diagram of the placement state of the PLC controller of this utility model;

[0028] Figure 3 is a schematic diagram of the disassembled parts of this utility model;

[0029] Figure 4 is a disassembled schematic diagram of the electrical connection component of this utility model;

[0030] Figure 5 is a schematic diagram showing the disassembly of the snap-fit ​​base and the inverted convex slide of this utility model;

[0031] Figure 6 is a cross-sectional view of the structure of the convex card seat, card connector, and inverted convex slide of this utility model when they are assembled together.

[0032] In the diagram: 1. Support assembly; 101. L-shaped tooling table; 102. Linear slide; 103. Vertical slide; 104. First connecting block; 105. Pneumatic push rod; 106. Adjusting bolt; 2. Positioning assembly; 201. End face stop; 202. First toothed arm; 203. First transmission gear; 204. Side stop; 205. First locking bolt; 3. Electrical connection assembly; 301. Concave seat; 302. Inverted convex slide; 303. Snap-fit ​​groove; 304. Snap-fit ​​seat; 305. Arc-shaped elastic snap-fit; 306. Convex snap-fit ​​seat; 307. Probe; 308. Wire; 309. Adjustment unit; 310. Upper stop bar; 311. Straight slot; 4. PLC controller; 3091. Second toothed arm; 3092. Second transmission gear; 3093. Second connecting block; 3094. Second locking bolt. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please refer to Figures 1 to 6. In this embodiment of the present invention, a PLC controller test fixture includes a support assembly 1. The support assembly 1 includes an L-shaped fixture table 101, a linear slide 102, a vertical slide block 103, a first connecting block 104, a pneumatic push rod 105, and an adjusting bolt 106.

[0035] The linear slide 102 is symmetrically opened at the top of the horizontal part of the L-shaped tooling table 101 and completely passes through the bottom of the horizontal part. The L-shaped tooling table 101 is equipped with a positioning component 2 through the linear slide 102. The positioning component 2 is used to realize the positioning and placement of the PLC controller 4.

[0036] The vertical slide block 103 is vertically slidably installed on the front end of the vertical part of the L-shaped tooling table 101 via a slide rail. The first connecting block 104 is symmetrically fixed on both sides of the vertical slide block 103. The pneumatic push rod 105 is fixed to the top of the vertical part of the L-shaped tooling table 101. The output end of the pneumatic push rod 105 passes through the top of the vertical part of the L-shaped tooling table 101 and through the first connecting block 104. The adjusting bolt 106 passes through the first connecting block 104 from one side and is tightly fitted to the outer wall of the output end of the pneumatic push rod 105. The adjusting bolt 106 is threadedly connected to the first connecting block 104 to realize the connection and fixation of the vertical end of the first connecting block 104 and the pneumatic push rod 105 and the adjustment of their relative positions.

[0037] The positioning component 2 includes an end face stop 201, a first toothed arm 202, a first transmission gear 203, a side stop 204, and a first locking bolt 205;

[0038] Two end face stops 201 are provided. The two end face stops 201 are distributed in parallel on the upper surface of the transverse part of the L-shaped tooling table 101 and are limited and slidably connected to the straight slide groove 102.

[0039] The end face stop 201 is fixedly connected to the first toothed arm 202 at the bottom of the horizontal part of the L-shaped tooling table 101. The two first toothed arms 202 are symmetrically distributed vertically. The first transmission gear 203 is located between the two first toothed arms 202 and meshes with the two first toothed arms 202. The first transmission gear 203 is rotatably connected to the bottom side of the horizontal part of the L-shaped tooling table 101 through a connecting shaft. The transmission between the first toothed arm 202 and the first transmission gear 203 is used to realize the synchronous and opposite movement of the two end face stops 201.

[0040] The side stop 204 is fixed to one side of an end face stop 201. The first locking bolt 205 is threaded to the top of the side stop 204 and passes through the side stop 204 to fit tightly against the upper surface of the horizontal part of the L-shaped tooling table 101, so as to fix the position of the end face stop 201.

[0041] The two end face stops 201 are used to limit the front and rear ends of the PLC controller 4, and the side stop 204 is used to position one side of the PLC controller 4.

[0042] The electrical connection assembly 3 includes a concave seat 301, an inverted convex slide 302, a snap-fit ​​groove 303, a snap-fit ​​seat 304, an arc-shaped elastic clip 305, a convex clip seat 306, a probe 307, and a wire 308.

[0043] The concave seat 301 is fixed to the front end of the vertical slide 103, and a rectangular groove is provided at the bottom of the concave seat 301; two inverted convex slides 302 are provided, and the two inverted convex slides 302 are distributed in parallel on the inner side of the concave seat 301 and are slidably connected to the rectangular groove.

[0044] The inner side of the inverted convex slide 302 is formed with a "T"-shaped straight groove. The snap-fit ​​groove 303 is symmetrically opened at the front and rear ends of the inverted convex slide 302 and communicates with the "T"-shaped straight groove. The arc-shaped elastic snap-fit ​​305 is symmetrically formed at the front and rear ends of the snap-fit ​​seat 304. The snap-fit ​​seat 304 is inserted into the upper half of the "T"-shaped straight groove, and the arc-shaped elastic snap-fit ​​305 snaps with the snap-fit ​​groove 303 to realize the limiting installation of the snap-fit ​​seat 304.

[0045] The lead wire 308 and the probe 307 are symmetrically fixed at the upper and lower ends of the convex bracket 306, and the probe 307 and the lead wire 308 are electrically connected to each other.

[0046] The convex bracket 306 fits against the top of the bracket 304 and the probe 307 passes through the arc-shaped elastic bracket 305 and the inverted convex slide 302 protrudes to the bottom of the concave bracket 301. The probe 307 contacts the screw in the input and output terminal of the PLC controller 4 to realize the electrical connection between the PLC controller 4 and the PLC tester.

[0047] The electrical connection assembly 3 also includes an adjustment unit 309, which includes a second toothed arm 3091, a second transmission gear 3092, a second connecting block 3093, and a second locking bolt 3094.

[0048] Two second toothed arms 3091 are provided. The two second toothed arms 3091 are respectively fixed on one side of the two inverted convex sliding blocks 302, and the two second toothed arms 3091 are symmetrically distributed in the horizontal direction. The second transmission gear 3092 is located in the middle of the two second toothed arms 3091 and meshes with the two second toothed arms 3091. The second transmission gear 3092 is rotatably connected to the bottom of the inner wall of the concave seat 301 through a connecting shaft.

[0049] The second connecting block 3093 is fixed to the side of an inverted convex slide 302 away from the second toothed arm 3091. The second locking bolt 3094 is threaded to the top of the second connecting block 3093 and passes through the second connecting block 3093 and fits tightly against the bottom of the inner wall of the concave seat 301, so as to fix the position of the inverted convex slide 302.

[0050] Multiple snap-fit ​​grooves 303 are evenly arranged along the long side of the inverted convex slide 302. The top of the arc-shaped elastic snap-fit ​​305 protrudes from the top of the snap-fit ​​seat 304, and a barb structure is formed at the contact position between the top of the arc-shaped elastic snap-fit ​​305 and the convex snap-fit ​​seat 306 for snap-fit ​​with the outer wall of the convex snap-fit ​​seat 306.

[0051] In this embodiment, the operating steps for testing the PLC controller 4 using this fixture are as follows:

[0052] The PLC controller 4 is placed on the top of the horizontal part of the L-shaped workbench 101. Its two end face stops 201 limit the front and rear movement of the PLC controller 4, and the side stop 304 positions one side of the PLC controller 4.

[0053] Then, by activating the pneumatic push rod 105, the electrical connection assembly 3 can be moved down as a whole, so that the probe 307 is in contact with the screw in the input / output port of the PLC controller 4. This realizes the electrical connection between the PLC controller 4 and the PLC tester (it should be noted that the wire 308 is electrically connected to the PLC tester, which is a tool specifically designed for fast and efficient testing of programmable logic controller (PLC) input / output (I / O) modules, wiring and field signals). After that, the test operation can be performed.

[0054] During this process, different models of PLC controllers 4 can be matched through adjustments, and the operation is as follows:

[0055] 1. By loosening the first locking bolt 205, the end face stop 201 can be moved. Through the transmission of the two first toothed arms 202 and the first transmission gear 203, the two end face stops 201 can move synchronously and in opposite directions to match the width of different models of PLC controllers 4 (it should also be noted that when the PLC controller 4 is placed, one side is attached to the side stop 204 to achieve the side position positioning).

[0056] 2. By loosening the second locking bolt 2094, the two inverted convex slides 302 can move synchronously in opposite directions (the principle is the same as that of the positioning component 2), so that the spacing of the two rows of probes 307 can be matched with the spacing of the input and output ports of different models of PLC controllers 4.

[0057] 3. By separating the convex retainer 306 from the retaining seat 304, the probe 307 can be removed. At the same time, the two arc-shaped elastic retainers 305 can be pinched together to separate them from the retaining groove 303, thus removing the retaining seat 304. Afterwards, the position of the retaining seat 304 can be adjusted and installed according to the position of the input / output ports on the PLC controller 4. Then, the convex retainer 306 is connected to the retaining seat 304 (it should be noted that the barb structure at the top of the arc-shaped elastic retainer 305 engages with the outer wall of the convex retainer 306 (see Figure 6), thus fixing the convex retainer 306. At the same time, the convex retainer 306 compresses the arc-shaped elastic retainer 305, preventing it from shrinking and deforming, thus fixing the position of the retaining seat 304). This allows for adjustment of the number and position of the probes 307 to match the changes in the input / output ports on different models of PLC controllers 4.

[0058] 4. By loosening the adjusting bolt 106, the height of the vertical slide 103 and the electrical connection assembly 3 can be adjusted. In this way, while keeping the stroke of the pneumatic push rod 105 constant, the moving height of the probe 307 can be matched with the PLC controller 4 of different heights.

[0059] The combination of these multiple parts effectively improves the applicability of the tooling and enhances its versatility.

[0060] Please refer to Figures 1-5. Two symmetrically distributed upper baffles 310 are fixed on the top inner side of the concave seat 301. The upper baffles 310 are in contact with the upper surface of the inverted convex slide 302 to achieve vertical positioning of the inverted convex slide 302.

[0061] An upper stop bar 310 contacts the second locking bolt 3094, and a straight groove 311 is provided at the contact position for the second locking bolt 3094 to pass through and slide.

[0062] In this embodiment: the upper stop bar 310 can limit and guide the movement of the inverted convex slide 302, and the opening of the straight slot 311 can provide space for the movement of the second locking bolt 3094.

[0063] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A PLC controller testing fixture, comprising a support assembly (1), characterized in that, The support assembly (1) includes an L-shaped tooling table (101), a linear slide (102), a vertical slide (103), a first connecting block (104), a pneumatic push rod (105), and an adjusting bolt (106). The linear slide (102) is symmetrically opened at the top of the horizontal part of the L-shaped tooling table (101) and completely penetrates the bottom of the horizontal part. The L-shaped tooling table (101) is equipped with a positioning assembly (2) through the linear slide (102). The positioning assembly (2) is used to position the PLC controller (4). The vertical slide (103) is vertically slidably installed at the front end of the vertical part of the L-shaped tooling table (101) through a slide rail. The first connecting block (104) is symmetrically fixed on both sides of the vertical slide (103). The pneumatic push rod (105) Fixed to the top of the vertical part of the L-shaped tooling table (101), the output end of the pneumatic push rod (105) passes through the top of the vertical part of the L-shaped tooling table (101) and through the first connecting block (104). The adjusting bolt (106) passes through the first connecting block (104) from one side and is tightly fitted to the outer wall of the output end of the pneumatic push rod (105). The adjusting bolt (106) is threadedly connected to the first connecting block (104) to realize the connection and fixation of the vertical end of the first connecting block (104) and the pneumatic push rod (105) and the relative position adjustment. An electrical connection component (3) is installed at the front end of the vertical slide (103). The electrical connection component (3) is used to match the input and output positions of different models of PLC controllers (4).

2. The PLC controller testing fixture according to claim 1, characterized in that, The positioning component (2) includes an end face stop (201), a first toothed arm (202), a first transmission gear (203), a side stop (204), and a first locking bolt (205). Two end face stops (201) are provided, and the two end face stops (201) are parallelly distributed on the upper surface of the horizontal portion of the L-shaped tooling table (101) and are slidably connected to the linear slide groove (102). The end face stop (201) is fixedly connected to the first toothed arm (202) at the bottom of the horizontal portion of the L-shaped tooling table (101). The two first toothed arms (202) are symmetrically distributed vertically. The first transmission gear (203) is located between the two first toothed arms (202) and meshes with them. The PLC controller (4) is rotatably connected to the bottom side of the horizontal part of the L-shaped tooling table (101) via a connecting shaft. The transmission of the first gear arm (202) and the first transmission gear (203) is used to realize the synchronous and opposite movement of the two end face stops (201). The side stop (204) is fixed to one side of one end face stop (201). The first locking bolt (205) is threaded to the top of the side stop (204) and passes through the side stop (204) and fits tightly against the upper surface of the horizontal part of the L-shaped tooling table (101) to realize the position fixation of the end face stop (201). The two end face stops (201) are used to limit the front and rear ends of the PLC controller (4), and the side stop (204) is used to position one side of the PLC controller (4).

3. The PLC controller testing fixture according to claim 1, characterized in that, The electrical connection assembly (3) includes a concave seat (301), an inverted convex slide (302), a snap-fit ​​groove (303), a snap-fit ​​seat (304), an arc-shaped elastic clip (305), a convex clip (306), a probe (307), and a wire (308). The concave seat (301) is fixed to the front end of the vertical slide (103), and a rectangular groove is provided at the bottom of the concave seat (301). There are two inverted convex slides (302), which are parallel to each other on the inner side of the concave seat (301) and slidably connected to the rectangular groove. The inner side of the inverted convex slide (302) is formed with a "T"-shaped straight groove. The snap-fit ​​groove (303) is symmetrically opened at the front and rear ends of the inverted convex slide (302) and communicates with the "T"-shaped straight groove. The arc-shaped elastic clip (305) is symmetrically opened at the front and rear ends of the inverted convex slide (302). The front and rear ends of the snap-fit ​​base (304) are formed. The snap-fit ​​base (304) is inserted into the upper half of the "T"-shaped straight slot, and the arc-shaped elastic snap-fit ​​piece (305) is snapped into the snap-fit ​​groove (303) to realize the limiting installation of the snap-fit ​​base (304). The wire (308) and the probe (307) are symmetrically fixed at the upper and lower ends of the convex snap-fit ​​base (306), and the probe (307) and the wire (308) are electrically connected to each other. The convex snap-fit ​​base (306) fits against the top of the snap-fit ​​base (304), and the probe (307) passes through the arc-shaped elastic snap-fit ​​piece (305), the inverted convex slide (302) protrudes to the bottom of the concave seat (301), and the probe (307) contacts the screw in the input and output terminal of the PLC controller (4) to realize the electrical connection between the PLC controller (4) and the PLC tester.

4. The PLC controller testing fixture according to claim 3, characterized in that, The electrical connection assembly (3) further includes an adjustment unit (309), which includes a second toothed arm (3091), a second transmission gear (3092), a second connecting block (3093), and a second locking bolt (3094). Two second toothed arms (3091) are provided, each fixed to one side of a two inverted convex slide block (302), and symmetrically distributed horizontally. The second transmission gear (3092) is located between the two second toothed arms (3091). The second transmission gear (3092) is located in the middle and meshes with two second toothed arms (3091). The second transmission gear (3092) is rotatably connected to the bottom of the inner wall of the concave seat (301) through a connecting shaft. The second connecting block (3093) is fixed to the side of an inverted convex slide (302) away from the second toothed arm (3091). The second locking bolt (3094) is threaded to the top of the second connecting block (3093) and passes through the second connecting block (3093) and fits tightly against the bottom of the inner wall of the concave seat (301) to achieve the position fixation of the inverted convex slide (302).

5. The PLC controller testing fixture according to claim 4, characterized in that, The inner top of the concave seat (301) is also fixed with two symmetrically distributed upper baffles (310). The upper baffles (310) are in contact with the upper surface of the inverted convex slide (302) to achieve vertical positioning of the inverted convex slide (302). One of the upper baffles (310) is in contact with the second locking bolt (3094), and a straight slot (311) is provided at the contact position for the second locking bolt (3094) to pass through and slide.

6. The PLC controller testing fixture according to claim 3, characterized in that, The snap-fit ​​groove (303) is evenly provided in multiple places along the long side of the inverted convex slide (302). The top of the arc-shaped elastic snap-fit ​​(305) protrudes from the top of the snap-fit ​​seat (304), and a barb structure is formed at the contact position between the top of the arc-shaped elastic snap-fit ​​(305) and the convex snap-fit ​​seat (306) for snap-fitting with the outer wall of the convex snap-fit ​​seat (306).

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