A user-programmable PLC serial communication expansion module

Abstract

This invention discloses a user-programmable PLC serial communication expansion module, comprising: a housing; a data connector fixedly connected to the side surface of the housing; a front cover plate fixedly connected to the side surface of the housing; a wire connector fixedly connected to the lower surface of the housing; a network cable slot opened on the lower surface of the housing; ventilation holes opened on the side surface of the housing; a stabilizing device provided on the lower surface of the wire connector; a guiding device provided on one side of the housing near the ventilation holes; a mounting groove opened on the side surface of the housing; a contact device provided on the inner wall of the mounting groove; the stabilizing device includes a guide rail, the guide rail being fixedly connected to the surface of the guide connector; and a guide post fixedly connected to the inner wall of the guide rail. By utilizing the interlocking structure of multiple components in the device, the wire is stably clamped. Because the position of the clamped wire is restricted, the difficulty of fixing the wire is reduced, providing convenience for installation personnel and realizing the expansion module's ability to initially restrict the wire.

Description

Technical Field

[0001] This invention relates to the field of live communication expansion module technology, specifically a user-programmable PLC serial communication expansion module. Background Technology

[0002] A PLC, or Programmable Logic Controller, is a digital electronic system specifically designed for industrial applications. It can load control instructions into memory for storage and execution. A programmable controller consists of a CPU, instruction and data memory, input / output interfaces, power supply, and digital-to-analog converters. Early programmable logic controllers only had logic control functions, hence the name. Later, with continuous development, these initially simple computer modules acquired various functions including logic control, timing control, analog control, and multi-machine communication, and the name was changed to Programmable Controller. However, due to the conflict between its abbreviation PC and Personal Computer (PC), and due to convention, people still frequently use the term Programmable Logic Controller and the abbreviation PLC.

[0003] The basic structure of a PLC can be divided into: a power supply, which converts AC power into DC power required by the PLC; a central processing unit, which processes and runs user programs, performs logical and mathematical operations, and controls the entire system to coordinate it; a memory, which stores system programs, user programs, logical variables, and other information; an input unit, which receives signals from the master control element and the detection element; and an output unit, which transmits the PLC's output signals to the controlled device and drives the actuators of the controlled device.

[0004] However, the existing processing module has the following shortcomings:

[0005] In daily use, it has been found that PLC serial communication expansion modules such as CN203012439U often require assistance from installers when connecting wires. During installation, the need for single-handed support makes subsequent tool handling difficult, leading to low assembly efficiency. Furthermore, the airflow in these modules is often guided by the ventilation holes, resulting in obstructed airflow and low cooling efficiency. Additionally, the modules often come into direct contact with the mounting bracket during installation. The impact from this direct contact can cause slight misalignment of components, increasing the failure rate.

[0006] Therefore, we propose a user-programmable PLC serial communication extension module to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a user-programmable PLC serial communication expansion module. Through a stabilizing device connected to a wire connector, multiple components in the device work together to stably clamp the wire. Because the position of the wire is restricted after clamping, the difficulty of fixing the wire is reduced, which facilitates the installation operation for installers. This enables the expansion module to initially restrict the wire, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a user-programmable PLC serial communication expansion module, comprising: a housing, a data connector fixedly connected to the side surface of the housing, a front cover plate fixedly connected to the side surface of the housing, a wire connector fixedly connected to the lower surface of the housing, a network cable slot provided on the lower surface of the housing, and ventilation holes provided on the side surface of the housing.

[0009] The lower surface of the wire connector is provided with a stabilizing device, the outer shell is provided with a guiding device on one side of the ventilation hole, the side surface of the outer shell is provided with a mounting groove, and the inner wall of the outer shell is provided with a contact device.

[0010] The stabilizing device includes a guide rail, which is fixedly connected to the surface of the wire connector. A guide post is fixedly connected to the inner wall of the guide rail, and a limit spring is fixedly connected to the inner wall of the guide rail. A slider is slidably connected to the inner wall of the guide rail, and a lever is fixedly connected to the surface of the slider. A connecting frame is fixedly connected to the side surface of the slider, and a slot is formed in the inner wall of the connecting frame. A rubber gasket is fixedly connected to the inner wall of the connecting frame within the slot. Through the stabilizing device connected to the wire connector, the wire is stably clamped by the cooperation of multiple components. Because the position of the clamped wire is restricted, the difficulty of fixing the wire is reduced, providing convenience for installation personnel and realizing the expansion module's ability to initially restrict the wire.

[0011] Preferably, there are two guide posts, which are symmetrically arranged about the guide rail. The limiting spring is sleeved on the surface of the guide post, and the surface of the slider has a receiving groove. The limiting spring is fixedly connected to the inner wall of the receiving groove. The guide posts can assist the guide rail in constraining the position of the slider and guiding the sliding direction of the slider.

[0012] Preferably, the slider passes through the guide rail, and a circular hole is formed in the inner wall of the receiving groove. The guide post passes through the circular hole, and the lever is slidably connected to the inner wall of the guide rail. There are two levers, which are symmetrically arranged about the slider. The slider can support and fix the position of the connecting frame, and can also drive the connecting frames on both sides to move synchronously.

[0013] Preferably, there are two connectors, which are symmetrically arranged about the slider. Each connector abuts against the surface of the wire connector, and the rubber pad abuts against the surface of the connector. The connectors provide fixed support for the position of the rubber pad and also clamp and fix the wire in place.

[0014] Preferably, the guiding device includes a limiting ring, which is fixedly connected to the side surface of the housing. A guiding air duct is fixedly connected to the side of the limiting ring away from the housing. An adjusting disc is fixedly connected to the surface of the limiting ring, and a fixing ring is fixedly connected to the side of the housing located at the ventilation hole. The limiting ring can support the guiding air duct and guide the heat dissipation airflow of the module in conjunction with the guiding air duct.

[0015] Preferably, the surface of the fixing ring is provided with a sliding groove, and a pressing frame is slidably connected to the inner wall of the sliding groove. A return spring is fixedly connected to the inner wall of the pressing frame, and a pin is fixedly connected to the side of the pressing frame away from the outer shell. The fixing ring can limit the position of the limiting ring, and can also be used in conjunction with the pin and adjusting plate to fix the limiting ring.

[0016] Preferably, the limiting ring is connected to the ventilation holes on the surface of the outer frame, the adjusting plate is fixedly connected to the surface of the guide duct, and the surface of the adjusting plate has multiple equidistant adjusting holes. The fixing ring abuts against the surface of the limiting ring, the surface of the guide duct, and the surface of the adjusting plate. There are two pressing brackets, symmetrically arranged about the limiting ring. Each pressing bracket passes through a sliding groove, the return spring is fixedly connected to the inner wall of the sliding groove, and the pin passes through the sliding groove and is inserted into the inner wall of the adjusting hole. The return spring is provided to constrain the position of the pressing bracket and, in conjunction with the pressing bracket, restrict the position of the pin.

[0017] Preferably, the contact device includes a support frame, which is fixedly connected to the inner wall of the mounting groove. A connecting rod is slidably connected to the inner wall of the support frame, and a first spring is fixedly connected to the inner wall of the support frame. A limit hole is formed on the surface of the connecting rod, and a load-bearing frame is rotatably connected to the connecting rod on the inner wall of the limit hole. The support frame guides the movement direction of the connecting rod and simultaneously supports and fixes the position of the first spring. With the contact device, when the expansion module is installed, the abutment first contacts the mounting frame and is restricted by the mounting frame. Simultaneously, the expansion module presses against the support frame, which in turn presses against the second spring, causing the second spring to deform. The support frame then loses the constraint of the second spring and shifts. The support frame presses against the connecting rod, which in turn presses against the load-bearing frame, which in turn presses against the first spring, causing the first spring to deform. This, combined with the second spring, absorbs the impact force generated by the expansion module. By providing the contact device, the impact force during the installation of the expansion module can be absorbed, reducing the probability of internal component misalignment and further increasing the stability of the expansion module.

[0018] Preferably, a constraint groove is formed on the side of the support frame away from the outer shell. A second spring is fixedly connected to the inner wall of the constraint groove on the support frame. A stop block is fixedly connected to the surface of the second spring away from the support frame, and a constraint block is fixedly connected to the side of the stop block closer to the outer shell. The second spring can constrain the position of the stop block and, in conjunction with the first spring, absorb the impact force received by the module.

[0019] Preferably, there are two connecting rods, which are symmetrically arranged vertically about the support frame. The first spring is fixedly connected to the surface of the load-bearing frame, and the load-bearing frame is slidably connected to the inner wall of the support frame. There are also two constraint blocks, which are symmetrically arranged horizontally about the abutment block. Each constraint block has a rotating hole on its surface, and the connecting rod is hinged to the inner wall of the rotating hole. The cooperation of the constraint blocks on both sides can fix one end of the connecting rod and restrict the rotation axis of the connecting rod.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention, through a stabilizing device, allows for programming of the expansion module. The data cable is connected to the data connector, and the other connector is plugged into the computer. The expansion module can then be programmed via the computer to control mechanical equipment. When installing the expansion module's wires, a lever is moved, pulling a slider. The slider compresses a limit spring, causing the limit spring to deform. The slider, no longer constrained by the limit spring, shifts, and the connecting bracket moves with the slider. The wire is then inserted into the wire connector, and the lever is released. The slider loses pressure from the lever, the limit spring rebounds, and the lever is pushed back to its original position. The lever pushes the connecting bracket back to its original position, and the connecting bracket pushes a rubber pad against the wire surface, clamping the wire. The wire can then be fixed. This stabilizing device allows installers to operate the tools with both hands, reducing the difficulty of wire installation and further improving installation efficiency.

[0022] 2. This invention, through a guiding device, allows for adjustment of the heat dissipation direction of the expansion module. Pushing the two side pressing brackets compresses the return spring, causing it to deform. The pressing brackets, no longer constrained by the spring, displace, causing the pin to disengage from the adjustment plate. The adjustment plate, now free from the pin's restraint, then moves the guide duct, causing its outlet to rotate. Simultaneously, the guide duct rotates the adjustment plate. When another adjustment hole on the adjustment plate aligns with the pin, the pressing bracket is released. The return spring, no longer under pressure, rebounds, pushing the pressing bracket back to its original position. The pin is then pushed into the other adjustment hole, repositioning the adjustment plate. This completes the adjustment of the expansion module's heat dissipation direction. By using a guiding device, the heat dissipation direction of the expansion module can be adjusted, reducing the probability of blocked airflow and further improving the module's heat dissipation performance.

[0023] 3. By incorporating a contact device, this invention allows the abutment to contact the mounting frame first during the installation of the expansion module. The abutment is restrained by the mounting frame, while the expansion module presses against the support frame. The support frame presses against the second spring, causing the second spring to deform. The support frame then loses its constraint and shifts, pressing against the connecting rod, which in turn presses against the load-bearing frame. The load-bearing frame presses against the first spring, causing the first spring to deform. This, along with the second spring, absorbs the impact force generated by the expansion module. By incorporating the contact device, the impact force during the installation process of the expansion module can be absorbed, reducing the probability of internal component misalignment and further increasing the stability of the expansion module. Attached Figure Description

[0024] Figure 1 This is a three-dimensional view of the main structure of a user-programmable PLC serial communication expansion module according to the present invention.

[0025] Figure 2This invention provides a user-programmable PLC serial communication expansion module. Figure 1 Enlarged 3D view of the structure at point A in the middle;

[0026] Figure 3 This is a bottom-view perspective view of the structure in a user-programmable PLC serial communication expansion module of the present invention.

[0027] Figure 4 This invention provides a user-programmable PLC serial communication expansion module. Figure 3 Enlarged 3D view of the structure at point B in the middle;

[0028] Figure 5 This is a rear-view perspective view of the structure in a user-programmable PLC serial communication expansion module of the present invention.

[0029] Figure 6 This is an enlarged perspective view of the stabilization device structure in a user-programmable PLC serial communication expansion module of the present invention.

[0030] Figure 7 This is an enlarged perspective view of the guiding device structure in a user-programmable PLC serial communication expansion module of the present invention.

[0031] Figure 8 This invention provides a user-programmable PLC serial communication expansion module. Figure 7 Enlarged 3D view of the structure at point C;

[0032] Figure 9 This is an enlarged perspective view of the contact device structure in a user-programmable PLC serial communication expansion module of the present invention.

[0033] Figure 10 This invention provides a user-programmable PLC serial communication expansion module. Figure 9 Enlarged 3D view of the structure at point D.

[0034] In the diagram: 1. Outer shell; 2. Data connector; 3. Front cover; 4. Wire connector; 5. Network cable slot; 6. Stabilizing device; 61. Guide rail; 62. Guide post; 63. Limiting spring; 64. Slider; 65. Toggle block; 66. Connecting frame; 67. Rubber pad; 7. Guiding device; 71. Limiting ring; 72. Guide air duct; 73. Adjusting disc; 74. Fixing ring; 75. Pressing frame; 76. Return spring; 77. Pin; 8. Contact device; 81. Support frame; 82. Connecting rod; 83. First spring; 84. Load-bearing frame; 85. Second spring; 86. Abutment block; 87. Constraint block. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-10 As shown, this invention provides a technical solution: a user-programmable PLC serial communication expansion module, comprising: a housing 1; a data connector 2 fixedly connected to the side surface of the housing 1; a front cover plate 3 fixedly connected to the side surface of the housing 1; a wire connector 4 fixedly connected to the lower surface of the housing 1; a network cable slot 5 formed on the lower surface of the housing 1; ventilation holes formed on the side surface of the housing 1; a stabilizing device 6 provided on the lower surface of the wire connector 4; a guiding device 7 provided on one side of the housing 1 near the ventilation holes; a mounting groove formed on the side surface of the housing 1; and a contact device 8 provided on the inner wall of the mounting groove. When programming the expansion module, a data cable is connected to the data connector 2, and the other connector of the data cable is plugged into a computer. The expansion module can then be programmed via the computer, enabling it to communicate with mechanical devices. The equipment is controlled so that when installing the extension module wire, the toggle block 65 is moved, which pulls the slider 64. The slider 64 compresses the limit spring 63, causing the limit spring 63 to deform. The slider 64 loses the constraint of the limit spring 63 and moves, and the connector 66 is moved by the slider 64. Then, the wire is inserted into the wire connector 4, and the toggle block 65 is released. The slider 64 loses the pressure of the toggle block 65, and the limit spring 63 rebounds. The toggle block 65 is pushed back to its original position, and the toggle block 65 pushes the connector 66 back to its original position. The connector 66 pushes the rubber pad to the surface of the wire and clamps the wire. Then, the wire can be fixed. By setting the stabilizing device 6, the installer can operate the installation tools with both hands, reducing the difficulty of wire installation and further improving the installation efficiency of the installer.

[0037] according to Figure 1-5As shown, the stabilizing device 6 includes a guide rail 61, which is fixedly connected to the surface of the wire connector 4. A guide post 62 is fixedly connected to the inner wall of the guide rail 61, and a limit spring 63 is fixedly connected to the inner wall of the guide rail 61. A slider 64 is slidably connected to the inner wall of the guide rail 61, and a lever 65 is fixedly connected to the surface of the slider 64. A connecting frame 66 is fixedly connected to the side surface of the slider 64. A slot is provided on the inner wall of the connecting frame 66, and a rubber gasket 67 is fixedly connected to the inner wall of the connecting frame 66 in the slot. Through the stabilizing device 6 connected to the wire connector 4, the wire is stably clamped by the cooperation of multiple parts in the device. Because the position of the wire is restricted after clamping, the difficulty of fixing the wire is reduced, which provides convenience for the installation operation of the installer and realizes the ability of the expansion module to initially restrict the wire.

[0038] according to Figure 3 As shown, there are two guide posts 62, which are symmetrically arranged about the guide rail 61. A limiting spring 63 is sleeved on the surface of the guide post 62. A receiving groove is formed on the surface of the slider 64, and the limiting spring 63 is fixedly connected to the inner wall of the receiving groove. The guide posts 62 assist the guide rail 61 in constraining the position of the slider 64 and guiding the sliding direction of the slider 64.

[0039] according to Figure 4 As shown, slider 64 passes through guide rail 61, and a circular hole is formed in the inner wall of the storage groove. Guide post 62 passes through the circular hole. Two levers 65 are slidably connected to the inner wall of guide rail 61, and the two levers 65 are symmetrically arranged about slider 64. Sliding slider 64 can support and fix the position of connecting frame 66, and can also drive the two connecting frames 66 on both sides to move synchronously.

[0040] according to Figure 3-4 As shown, there are two connector brackets 66, which are symmetrically arranged about the slider 64. The connector brackets 66 abut against the surface of the wire connector 4, and the rubber pad 67 abuts against the surface of the connector brackets 66. The connector brackets 66 can fix and support the position of the rubber pad 67, and can also be used to clamp and fix the wire in conjunction with the rubber pad 67.

[0041] according to Figure 6As shown, the guiding device 7 includes a limiting ring 71, which is fixedly connected to the side surface of the outer casing 1. A guiding air duct 72 is fixedly connected to the side of the limiting ring 71 away from the outer casing 1. An adjusting plate 73 is fixedly connected to the surface of the limiting ring 71. A fixing ring 74 is fixedly connected to the side of the outer casing 1 located at the ventilation hole. The limiting ring 71 supports the guiding air duct 72 and guides the heat dissipation airflow of the module in conjunction with the guiding air duct 72. When it is necessary to adjust the heat dissipation direction of the expansion module through the guiding device 7, the two pressing brackets 75 are pushed. The pressing brackets 75 compress the return spring 76. The return spring 76 is deformed by compression, and the pressing brackets 75 are displaced after losing the constraint of the return spring 76. The pressing brackets 75 drive the pin 77 to disengage from the adjusting plate 73. The adjusting plate 73 is no longer restricted by the pin 77, and then the guiding air duct 72 is moved, and the outlet of the guiding air duct 72 rotates. Simultaneously, the guide duct 72 drives the adjustment plate 73 to rotate. When another adjustment hole on the adjustment plate 73 coincides with the pin 77, the pressing bracket 75 is released, the return spring 76 loses the pressure of the pressing bracket 75 and rebounds, the pressing bracket 75 is pushed back to its original position, the pin 77 is pushed into the other adjustment hole, and the position of the adjustment plate 73 is fixed again. The adjustment of the heat dissipation direction of the expansion module is then completed. By setting the guide device 7, the heat dissipation direction of the expansion module can be adjusted, reducing the probability of the heat dissipation airflow being blocked and further improving the heat dissipation performance of the expansion module.

[0042] according to Figure 8 As shown, a groove is formed on the surface of the fixing ring 74. A pressing frame 75 is slidably connected to the inner wall of the groove. A return spring 76 is fixedly connected to the inner wall of the pressing frame 75. A pin 77 is fixedly connected to the side of the pressing frame 75 away from the outer casing 1. The position of the limiting ring 71 can be restricted by the fixing ring 74, and the limiting ring 71 can be fixed by the pin 77 and the adjusting plate 73.

[0043] according to Figure 8 As shown, the limiting ring 71 is connected to the ventilation holes on the surface of the outer frame, the adjusting plate 73 is fixedly connected to the surface of the guide air duct 72, and the surface of the adjusting plate 73 has multiple equidistant adjusting holes. The fixing ring 74 abuts against the surface of the limiting ring 71, the surface of the guide air duct 72, and the surface of the adjusting plate 73. There are two pressing brackets 75, which are symmetrically arranged about the limiting ring 71. The pressing brackets 75 pass through the slide groove, the return spring 76 is fixedly connected to the inner wall of the slide groove, and the pin 77 passes through the slide groove and is inserted into the inner wall of the adjusting hole. The return spring 76 is provided to constrain the position of the pressing bracket 75 and, together with the pressing bracket 75, restrict the position of the pin 77.

[0044] according to Figure 6As shown, the contact device 8 includes a support frame 81, which is fixedly connected to the inner wall of the mounting groove. A connecting rod 82 is slidably connected to the inner wall of the support frame 81, and a first spring 83 is fixedly connected to the inner wall of the support frame 81. A limit hole is opened on the surface of the connecting rod 82, and a load-bearing frame 84 is rotatably connected to the inner wall of the limit hole. The support frame 81 guides the movement of the connecting rod 82 and supports and fixes the position of the first spring 83. With the contact device 8, when installing the expansion module, the abutment 86 first contacts the mounting frame and is restricted by it. Simultaneously, the expansion module presses against the support frame 81, which in turn presses against the second spring 85, causing it to deform. The support frame 81 then loses its constraint and shifts, pressing against the connecting rod 82, which in turn presses against the load-bearing frame 84. The load-bearing frame 84 then presses against the first spring 83, causing it to deform. This deformation, combined with the second spring 85, absorbs the impact force generated by the expansion module. By using the contact device 8, the impact force during installation is absorbed, reducing the probability of internal component misalignment and further increasing the stability of the expansion module.

[0045] A constraint groove is provided on the side of the support frame 81 away from the outer shell 1. A second spring 85 is fixedly connected to the inner wall of the constraint groove on the support frame 81. A stop block 86 is fixedly connected to the surface of the second spring 85 away from the support frame 81. A constraint block 87 is fixedly connected to the side of the stop block 86 closer to the outer shell 1. The position of the stop block 86 can be constrained by the second spring 85, and it can also work with the first spring 83 to absorb the impact force received by the module.

[0046] There are two connecting rods 82, which are symmetrically arranged vertically about the support frame 81. The first spring 83 is fixedly connected to the surface of the load-bearing frame 84, and the load-bearing frame 84 is slidably connected to the inner wall of the support frame 81. There are two constraint blocks 87, which are symmetrically arranged horizontally about the abutment block 86. The surface of the constraint block 87 has a rotating hole, and the connecting rod 82 is hinged to the inner wall of the rotating hole. By cooperating with the constraint blocks 87 on both sides, one end of the connecting rod 82 can be fixed, and the rotation axis of the connecting rod 82 can be restricted.

[0047] The overall effect of the mechanism is as follows: When programming the expansion module, connect the data cable to the data connector 2 and plug the other connector of the data cable into the computer. Then, the expansion module can be programmed through the computer, enabling the expansion module to control mechanical equipment. When installing the expansion module wires, move the toggle block 65. The toggle block 65 pulls the slider 64, which compresses the limit spring 63. The limit spring 63 is deformed by compression, and the slider 64 loses the constraint of the limit spring 63 and moves. The connecting bracket 66 is moved by the slider 64. Then, insert the wire into the wire connector 4 and release the toggle block 65. The slider 64 loses the pressure of the toggle block 65, and the limit spring 63 rebounds. The toggle block 65 is pushed back to its original position, and the toggle block 65 pushes the connecting bracket 66 back to its original position. The connecting bracket 66 pushes the rubber pad to the surface of the wire and clamps the wire. Then, the wire can be fixed. By setting the stabilizing device 6, the installer can operate the installation tools with both hands, reducing the difficulty of wire installation and further improving the installation efficiency of the installer. Simultaneously, when the heat dissipation direction of the expansion module needs to be adjusted via the guide device 7, the two side pressing brackets 75 are pushed, the pressing brackets 75 compress the return spring 76, the return spring 76 is deformed by compression, the pressing brackets 75 lose the constraint of the return spring 76 and displace, the pressing brackets 75 drive the pin 77 to disengage from the adjustment plate 73, the adjustment plate 73 loses the restriction of the pin 77, and then the guide air duct 72 is moved, the outlet of the guide air duct 72 rotates, and at the same time the guide air duct 72 drives the adjustment plate 73 to rotate. When another adjustment hole on the adjustment plate 73 coincides with the pin 77, the pressing bracket 75 is released, the return spring 76 loses the pressure of the pressing bracket 75 and rebounds, the pressing bracket 75 is pushed back to its original position, the pin 77 is pushed into another adjustment hole, and the position of the adjustment plate 73 is fixed again. The heat dissipation direction of the expansion module is then adjusted. By setting the guide device 7, the heat dissipation direction of the expansion module can be adjusted, the probability of the heat dissipation airflow being blocked is reduced, and the heat dissipation performance of the expansion module is further improved. In addition, by setting the contact device 8, when installing the expansion module, the abutment 86 first contacts the mounting bracket and is restricted by the mounting bracket. At the same time, the expansion module squeezes the support frame 81, the support frame 81 squeezes the second spring 85, the second spring 85 is squeezed and deformed, the support frame 81 loses the constraint of the second spring 85 and displaces, the support frame 81 squeezes the connecting rod 82, the connecting rod 82 squeezes the load frame 84, the load frame 84 squeezes the second spring 85, the second spring 85 is squeezed and deformed, and works with the first spring 83 to absorb the impact force generated by the expansion module. By setting the contact device 8, the impact force of the expansion module during the installation process can be absorbed, reducing the probability of internal component displacement of the expansion module and further increasing the stability of the expansion module in use.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A user-programmable PLC serial communication expansion module, characterized in that: include: The outer shell (1) has a data connector (2) fixedly connected to its side surface, a front cover plate (3) fixedly connected to its side surface, a wire connector (4) fixedly connected to its lower surface, a network cable slot (5) provided on its lower surface, and ventilation holes provided on its side surface. The lower surface of the wire connector (4) is provided with a stabilizing device (6), the outer shell (1) is provided with a guiding device (7) on one side of the ventilation hole, the side surface of the outer shell (1) is provided with an installation groove, and the inner wall of the outer shell (1) is provided with a contact device (8). The stabilizing device (6) includes a guide rail (61), which is fixedly connected to the surface of the wire connector (4). A guide post (62) is fixedly connected to the inner wall of the guide rail (61). A limit spring (63) is fixedly connected to the inner wall of the guide rail (61). A slider (64) is slidably connected to the inner wall of the guide rail (61). A toggle block (65) is fixedly connected to the surface of the slider (64). A connecting frame (66) is fixedly connected to the side surface of the slider (64). A slot is provided on the inner wall of the connecting frame (66). A rubber pad (67) is fixedly connected to the inner wall of the connecting frame (66) in the slot. There are two connecting brackets (66), which are symmetrically arranged about the slider (64). The connecting brackets (66) abut against the surface of the wire connector (4), and the rubber pad (67) abuts against the surface of the connecting brackets (66). The guiding device (7) includes a limiting ring (71), which is fixedly connected to the side surface of the outer shell (1). A guiding air duct (72) is fixedly connected to the side of the limiting ring (71) away from the outer shell (1). An adjusting plate (73) is fixedly connected to the surface of the limiting ring (71). A fixing ring (74) is fixedly connected to the side of the outer shell (1) located at the ventilation hole. A sliding groove is opened on the surface of the fixing ring (74). A pressing frame (75) is slidably connected to the inner wall of the sliding groove. A return spring (76) is fixedly connected to the inner wall of the pressing frame (75). The pressing frame (75) is fixedly connected to a pin (77) on the side away from the outer shell (1); the limiting ring (71) is connected to the ventilation hole on the surface of the outer frame; the adjusting plate (73) is fixedly connected to the surface of the guide air pipe (72); the surface of the adjusting plate (73) is provided with a plurality of equidistant adjusting holes; the fixing ring (74) abuts against the surface of the limiting ring (71); the fixing ring (74) abuts against the surface of the guide air pipe (72); the fixing ring (74) abuts against the surface of the adjusting plate (73); there are two pressing frames (75); the two pressing frames (75) are symmetrically arranged about the limiting ring (71); the pressing frame (75) is set through the slide groove; the return spring (76) is fixedly connected to the inner wall of the slide groove; the pin (77) is set through the slide groove; the pin (77) is inserted into the inner wall of the adjusting hole. The contact device (8) includes a support frame (81), which is fixedly connected to the inner wall of the mounting groove. A connecting rod (82) is slidably connected to the inner wall of the support frame (81), and a first spring (83) is fixedly connected to the inner wall of the support frame (81). A limit hole is formed on the surface of the connecting rod (82), and a load-bearing frame (84) is rotatably connected to the inner wall of the limit hole on the connecting rod (82). A constraint groove is formed on the side of the support frame (81) away from the outer shell (1), and a second spring (85) is fixedly connected to the inner wall of the support frame (81) in the constraint groove. The second spring (85) is located away from the surface of the support frame (81). A stop block (86) is fixedly connected to the surface, and a constraint block (87) is fixedly connected to the side of the stop block (86) near the outer shell (1); there are two connecting rods (82), which are arranged symmetrically about the support frame (81); the first spring (83) is fixedly connected to the surface of the load frame (84), and the load frame (84) is slidably connected to the inner wall of the support frame (81); there are two constraint blocks (87), which are arranged symmetrically about the stop block (86); the surface of the constraint block (87) is provided with a rotating hole, and the connecting rod (82) is hinged to the inner wall of the rotating hole.

2. The user-programmable PLC serial communication expansion module according to claim 1, characterized in that: There are two guide posts (62), which are arranged symmetrically about the guide rail (61). The limiting spring (63) is sleeved on the surface of the guide post (62). The surface of the slider (64) is provided with a storage groove. The limiting spring (63) is fixedly connected to the inner wall of the storage groove.

3. The user-programmable PLC serial communication expansion module according to claim 2, characterized in that: The slider (64) is set through the guide rail (61). The slider (64) has a round hole on the inner wall of the storage groove. The guide post (62) is set through the round hole. The toggle block (65) is slidably connected to the inner wall of the guide rail (61). There are two toggle blocks (65). The two toggle blocks (65) are arranged symmetrically about the slider (64).

Images