Switch machine contact service life test bench and test circuit

Abstract

The invention relates to the field of industrial automation testing, in particular to a point switch contact service life test bench and a test circuit, and the test bench comprises a plurality of contact seats, a plurality of static contacts and a plurality of movable contacts corresponding to the static contacts are fixedly connected to the contact seats, the bottom ends of the movable contacts are hinged to the contact seats, the movable contacts are uniformly distributed at the two ends of the contact seats, and the number of the contact seats is multiple; the connecting rod is horizontally arranged and slidably connected to the upper portion of the test bench surface, a groove is formed in the test bench surface in a penetrating mode, and a driving piece is arranged below the test bench surface and drives the connecting rod to slide; the locking iron is connected with one end of the connecting rod and horizontally slides synchronously with the connecting rod, one end of the locking iron extends towards the contact seat, and a clamping groove is formed in the top side of the end of the locking iron; the idler wheel is hinged to the contact seat, hinge shafts of the movable contacts extend out of the contact seat and are elastically connected with an axle of the idler wheel, and the wheel face of the idler wheel abuts against the top end of the locking iron; the test assembly is connected with the static contact through a wire. The method has the effects of improving the test efficiency of the switch machine and enhancing the reliability of test data.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial automation testing, in particular to a switch machine contact life test bench and test circuit. BACKGROUND

[0002] The switch machine is a key equipment in the railway system, mainly used for controlling the switching of the track turnout, to ensure that the train travels accurately according to the accurate path. The moving and static contacts are key components of the switch machine, which convert the mechanical position of the turnout into an electrical signal through contact and disconnection, for monitoring the road connection state. In recent years, the failure rate of the contacts in the switch machine has been on the rise, and the failure of the contacts can cause false indication of the on-site signal equipment, affecting the normal operation of the railway, therefore, the contact life test of the switch machine is very necessary, we can find out the key to failure through the test, and improve the service life of the switch machine as a whole.

[0003] In the past, the test method of contact life is usually to install the test contact in the switch machine, to simulate the state of the contact in the actual working environment. But this has significant shortcomings. First of all, due to the heating phenomenon of the switch machine oil circuit system after a long time of work, it is necessary to stop frequently during the test process, combined with the smooth action of the hydraulic system, which leads to slow action process of the contact, low test efficiency; secondly, manual control and supervision are required during the test process, and the test data is very subjective and the data reliability is poor. SUMMARY

[0004] In order to improve the test efficiency of the switch machine and enhance the reliability of the test data, the present application provides a switch machine contact life test bench and test circuit.

[0005] On the one hand, the present application provides a switch machine contact life test bench using the following technical solution: A switch machine contact life test bench, comprising a contact seat, a plurality of static contacts are fixedly connected to the contact seat, a plurality of moving contacts corresponding to the static contacts, the bottom end of the moving contact is hinged to the contact seat, the moving contacts are uniformly distributed at both ends of the contact seat, the contact seat is provided with a plurality of, further comprising: A connecting rod is horizontally arranged and slidingly connected above the test bench table, a slot is provided on the test bench table, a driving element is arranged below the test bench table, and the connecting rod is driven to slide; A locking iron is connected to one end of the connecting rod and synchronously slides horizontally with the connecting rod, one end of the locking iron extends towards the contact seat, and a clamping groove is formed in the top side of the end of the locking iron; A roller is hinged to the contact seat, the hinge shafts of a plurality of moving contacts extend out of the contact seat and are elastically connected with the roller shaft, and the roller surface abuts against the top end of the locking iron; A test assembly is connected to the static contact through a wire.

[0006] By adopting the technical scheme, the movable contact and the fixed contact are the same type of movable and fixed contact assemblies as the actual railway turnout switch machine, and are copied to the test bench to test the effective opening and closing of the movable and fixed contacts. In the test process, the connection mode of the movable and fixed contacts and the movement mode of the movable contact are required to simulate the actual turnout switching scene, therefore, the movable contact and the fixed contact are one-to-one corresponding, the movable contact and the fixed contact are grouped, one group includes at least three movable and fixed contacts, two groups of movable and fixed contacts correspond to one contact seat respectively, two groups of contacts are arranged at two ends of the contact seat, and one group of movable contacts at one end of the contact seat is driven to rotate around the bottom hinge shaft through the connecting structure of the connecting rod, the locking iron and the roller, and is attached to the fixed contact. At the same time, the movable contact and the fixed contact at the other end of the contact seat are disconnected, that is, the engagement state of the movable and fixed contacts at the two ends of the contact seat is opposite. Specifically, the connecting rod is a power transmission assembly connecting the driving member, the movable contact hinge shaft, the locking iron connects the connecting rod and the contact seat, and ensures that the sliding driving force is transmitted to the movable contact hinge shaft on the contact seat through the connecting rod; the top side of the locking iron abuts against the roller surface and the clamping groove is formed at the two ends of the top side. When the length of the locking iron is a predetermined length, after the locking iron slides to the lower side of the roller, the roller slides into the clamping groove to realize clamping under the action of the elastic force. The clamping groove is smoothly formed to realize smooth sliding of the roller. In summary, when the switch machine contact life test is performed, the test steps are as follows: the driving member drives the connecting rod to slide, drives the locking iron to slide, the locking iron abuts against the roller surface and slides, when the clamping groove of the locking iron slides to the lower side of the roller, the roller falls under the action of the elastic force, drives the movable contact on the same side of the clamping groove to fall into the inside of the fixed contact, at the same time, the state of the movable contact on the other side is synchronously converted, realizes the opening and closing of the movable and fixed contacts, in the case that the test assembly is connected through the wires, the closing of the movable and fixed contacts in a single time constitutes a complete closing loop, the closing of the movable and fixed contacts can be known by monitoring the action current, so as to judge whether it is effective.

[0007] Optionally, the driving member comprises: The lower sliding block is vertically arranged and slidably connected in the slot, and protrudes from the top and bottom surfaces of the test bench. The part of the lower sliding block protruding from the surface of the test bench is detachably connected with the plurality of connecting rods. The driving cylinder is horizontally arranged at the bottom side of the test bench, and the piston rod end is fixedly connected with the lower sliding block.

[0008] By adopting the above technical solution, the driving cylinder is the power part, and the piston rod acts on the lower slider to make the lower slider slide along the opening direction of the through-groove, thereby driving the lower slider to pull the connecting rod; the connecting rod and the lower slider are detachably connected. In practical applications, a pin connection method is generally adopted, that is, a pin hole is opened at the part of the lower slider protruding from the top side of the test bench, and the part of the connecting rod corresponding to the pin hole is set as a U-shaped slot covering the lower slider, and a through-hole is also opened corresponding to the pin hole. The technician inserts a metal pin into the through-hole to connect the lower slider and the connecting rod; Furthermore, the portion of the lower slider protruding from the test bench surface can be simultaneously penetrated by two pin holes, and the two pin holes are simultaneously used to connect multiple connecting rods. In actual applications, two pin holes are generally selected, and the pin connection structure of the lower slider and the connecting rod is reasonably utilized to connect two or more connecting rods to a driving cylinder, so that one driving cylinder drives multiple locking irons to slide; thereby, multiple sets of contact seats can be set on both sides of the test bench, and connected to a driving cylinder through the lower slider, the connecting rod, and the locking iron. The movable contacts on all the contact seats can be driven to rotate around the hinge point by one driving cylinder; In addition, the multiple contact seats on the test bench can flexibly change the number of tests more conveniently. Technicians can remove the metal pin, lift the connecting rod, and cancel the connection between the lower slider and the connecting rod, thereby reducing the number of contact service life tests.

[0009] Optionally, also include: The mounting plate is horizontally arranged on the opposite sides of the plurality of contact seats at the same end of the test bench. A spring is arranged on the mounting plate at an angle downward. The top end of the spring is connected to the mounting plate, and the bottom end is connected to the roller axle.

[0010] By adopting the above technical solution, the mounting plate is the main structure supporting the elastic component, which is connected to the hinge shaft of the dynamic contact and is used to connect the spring. The roller axle can be protrudingly formed with a structure connecting the spring, so that the spring is connected to the roller axle. As a result, one end of the downward-sloping spring abuts against the mounting plate and is supported by the mounting plate, and the other end provides elastic pressure to the downward-sloping roller axle. In this solution, the roller axle is non-rotating, so it only needs to be fixed to the spring. The top end of the spring is connected to the mounting plate by a bolt connection, that is, a through-hole for bolt insertion is provided on the mounting plate, the bottom end of the bolt is extended out of the bottom side of the mounting plate, close to the spring, the top end of the spring is plugged into the bottom end of the bolt, and the bolt is fixed by a nut; therefore, when the slot on the top side of the locking iron end slides below the roller surface, the vertical downward elastic force of the spring causes the roller to slide into the slot. The reason why the roller is selected as the clamping part is that the roller surface is round and has a higher degree of stability.

[0011] On the one hand, the present invention provides a test circuit for a switch machine contact life test bench adopts the following technical solution: The test circuit of the switch machine contact life test bench comprises a control circuit of the drive cylinder, a plurality of groups of contact points provided at both ends of the moving contact and the static contact and connected to the power grid, and a plurality of contact points provided at both ends of the moving contact and the static contact in one group are connected in parallel; Each group of the static contact and the moving contact is provided with a to contact point at both ends. Further comprising: A calculation component connected between the control circuit of the drive cylinder and the to contact point at both ends of each group of the moving contact and the static contact.

[0012] By adopting the above technical solution, two groups of moving contact and static contact are provided at both ends of each contact seat, and a wire contact point is correspondingly connected to each group of moving contact and static contact, so that each moving contact and static contact is connected to the test circuit. Specifically, it is necessary to determine whether each moving contact and static contact is effectively engaged, that is, to determine whether the moving contact effectively rotates and fits the two sides of the static contact. When the moving contact fits the two sides of the static contact, the moving contact and the static contact form a complete closed loop, and the open circuit is closed. At this time, the calculation component receives a complete current signal. In actual application, the calculation component can adopt a single-chip microcomputer or a programmable logic device (PLC). It is recommended to adopt the PLC, and specifically, a Siemens controller based on the PLC can be selected. The Siemens controller has the top anti-electromagnetic interference capability in the industry, can effectively ensure the validity of data, has a high-precision timing and low-delay interrupt mechanism to ensure the immediacy of data, and is more suitable for the service life test of the switch machine in the field. The Siemens controller internally has a microsecond-level current meter, which can receive a sensitive current signal. In summary, the above scheme forms the basic function of the test circuit. The engagement of a single moving contact and static contact forms a complete loop under the action of power supply, and the calculation component can receive an electric signal under the condition of being connected to the calculation component. If the current value of the electric signal is within the preset current value, that is, the current intensity meets the requirements, the current statistical record is effective engagement. Therefore, the engagement life test of one hundred thousand times or one million times is automatically and continuously and efficiently completed.

[0013] Optionally, one group of the moving contact and the static contact at one end of the contact seat is connected to a single-phase rectifier bridge. The two groups of moving contact and static contact at both ends of the contact seat are respectively connected to a direct-current power supply and an alternating-current power supply.

[0014] By adopting the technical scheme, in the application environment of a real railway turnout, two groups of moving contacts and static contacts are arranged in a switch machine to display the closing state of the closing side of the road and the separation state of the separation side of the road, so that two groups of moving contacts and static contacts are arranged on the contact seat to simulate the actual application situation, the contact seat can simulate the contact situation of the switch machine, and the joint states of the moving contacts and the static contacts at two ends of the contact seat are opposite; therefore, the contact seat can measure the operation states of the two groups of moving contacts and static contacts at the same time, one group of moving contacts and static contacts on the contact seat is connected to a direct current power supply, and the other group is connected to an alternating current power supply, and the direct current power supply and the alternating current power supply are connected to the contact to form an open circuit for each group of moving contacts and static contacts. In the laboratory, the lack of test conditions needs to be considered, and a single-phase rectifier bridge is connected to one group of moving contacts and static contacts. When two groups of alternating current power supplies are connected to the contact at the same time, the alternating current under the action of the single-phase rectifier bridge becomes direct current, which is suitable for the case where a direct current power supply is lacking. In the above scheme, the alternating current and the direct current are compared, on the one hand, the diversity of the actual application scene is considered, and in the actual application, both direct current and alternating current are used, and on the other hand, the difference in arc behavior is considered. As everyone knows, when the direct current is disconnected, the voltage persists, the arc is relatively difficult to extinguish, and the arc maintenance time is longer than that of alternating current, which makes the contact ablation of the moving contact and the static contact more serious. The ablation of the contact is an important factor that reduces the service life of the switch machine contact, and therefore, the resistance of the switch machine contact to the arc needs to be measured, and the number of effective contact opening and closing times under direct current or alternating current is observed.

[0015] Optionally, the control circuit of the driving cylinder is connected to a current sensor; and each group of the moving contacts and the static contacts is connected to a current sensor.

[0016] By adopting the above technical scheme, the current sensor is arranged on both sides of the moving contact and the static contact to monitor the operating current in the circuit. When a current mutation occurs in the circuit, the current sensor can send a monitoring electrical signal in real time. The current sensor is connected to the calculation component, and the monitoring result is sent to the calculation component in the form of an electrical signal. The calculation component or the PLC calculates the electrical signal of the current sensor, and alarms when a mutation occurs or the current exceeds a safety value. Additionally, the above technical scheme also provides a current sensor on one side of the driving cylinder to monitor the operating current of the driving cylinder, which is used to monitor the operating state of the cylinder. The lack of power of the cylinder is also a factor that affects the stability of the moving contact and the static contact, especially in the case of long-term continuous measurement.

[0017] Optionally, the calculation component further includes a circuit breaker and a contact seat circuit breaker. The calculation component circuit breaker is arranged between the calculation component and the protection line. The contact seat breaker is arranged between the dynamic contact, the static contact and the protection line.

[0018] By adopting the technical scheme, the breaker plays a role of overload and short circuit protection in the test circuit. The contact of the switch machine is frequently opened and closed in the service life test process. Local overheating or even short circuit may be caused by arc, increased contact resistance or material deterioration during the frequent opening and closing process. The damage speed increases when the direct current is used for the test. The breaker needs to be arranged to play a protection role when the service life cannot be accurately predicted. The calculation component breaker, specifically the PLC breaker, also plays a protection role and quickly blocks the connection between the PLC and the test circuit when the circuit is short-circuited.

[0019] Optionally, the contact is connected to the measuring element, and the dynamic contact and the static contact are connected to the protection line.

[0020] By adopting the technical scheme, the technical scheme provides another wiring scheme of the test circuit, that is, the two contacts are connected to the current and voltage measuring device, and the PLC keeps measuring the opening and closing times. Therefore, each group of dynamic contact and static contact needs to be connected to the normally open power supply and the protection line.

[0021] In summary, the present application has at least one of the following beneficial technical effects: 1. By cooperating the connecting rod with the locking iron, the synchronous operation of multiple dynamic contacts can be realized, the test efficiency is significantly improved, the force distribution uniformity is ensured, and the problem that the multiple point synchronous test cannot be considered in the traditional method is solved; 2. By adopting the driving cylinder as the power source, designing the special mechanical structure and integrating the special software, the test efficiency is greatly improved, the data reliability is significantly improved, the test safety is effectively ensured, and the cost is saved and the economic benefit is improved; 3. The driving element drives the connecting rod to slide through the lower sliding block, realizes the accurate control in the horizontal direction, and combines the electrical connection of the test component to fully simulate the actual working environment, enhances the authenticity and reliability of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure diagram of the dynamic and static contacts of the switch machine.

[0023] Figure 2 is a whole structure diagram of the embodiment of the present application.

[0024] Figure 3 is a structure diagram of the contact seat in the embodiment of the present application.

[0025] Figure 4 is Figure 3 A enlarged view of part A.

[0026] Figure 5 is a circuit diagram of a test circuit of an embodiment of the present application.

[0027] Reference signs: 1, contact seat; 11, static contact; 12, dynamic contact; 13, mounting plate; 14, roller; 15, clasp; 16, waist-shaped groove; 2, frame body; 21, frame plate; 22, driving cylinder; 23, lower sliding block; 24, lower sliding block seat; 25, connecting rod; 26, locking iron; 261, clamping groove; 3, table top; 4, current sensor. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the Figures 1-5 The present application will be further described in detail.

[0029] First, the present application discloses a contact assembly of a switch machine, which is disassembled in a same type switch machine in an actual turnout application scene to simulate a more real situation. Referring to Figure 1 A contact assembly of a switch machine includes a contact seat 1, which is a rectangular seat, and a group of static contacts 11 is installed on each section. The two groups of static contacts 11 at both ends of the contact seat 1 are symmetrically distributed along the center of the contact seat 1. Among the two static contacts 11 of one group, one static contact 11 near the end of the contact seat 1 is inclinedly arranged, and the other is vertically arranged. One dynamic contact 12 is hingedly connected at each end of the contact seat 1, and the hinge shaft is horizontally arranged at the bottom end of the dynamic contact 12. The dynamic contact 12 can rotate around the hinge shaft to adhere to the static contact 11 at one end, that is, one dynamic contact 12 at one end of the contact seat 1 can reciprocatingly rotate between the two static contacts 11 at the same end of the contact seat 1. The two dynamic contacts 12 are connected by a spring rod to make the two dynamic contacts 12 rotate synchronously and in the same direction. When one dynamic contact 12 adheres to the inclined static contact 11 at the same end of the contact seat 1, the dynamic contact 12 at the other end of the contact seat 1 adheres to the vertical static contact 11. The contact of the switch machine is a prior art, which is used to reflect the switching direction and switching state of the turnout, and the specific principle is not described in detail.

[0030] On the one hand, the present application discloses a switch machine contact life test bench. Referring to Figure 2The switch machine contact life test bench comprises a frame body 2, the top end of the frame body 2 is horizontally provided with a table top 3, which is the table top 3 of the test bench, four contact point seats 1 are distributed on the table top 3, so that a total of eight groups of contact points available for life test are distributed, and the four contact point seats 1 are symmetrically distributed at two ends of the test bench. The frame body 2 is horizontally provided with a frame plate 21 below the table top 3, and a preset interval is formed between the frame plate 21 and the table top 3; a driving cylinder 22 is horizontally provided at one end of the frame plate 21, the driving cylinder 22 is horizontally arranged, a lower sliding block seat 24 is fixedly connected to the central part of the frame plate 21, a lower sliding block 23 is slidably connected to the lower sliding block seat 24, a sliding groove is formed at the bottom end of the lower sliding block 23, the width of the sliding groove is equal to the width of the lower sliding block seat 24, and the lower sliding block 23 and the lower sliding block seat 23 are clamped, and the piston rod end of the driving cylinder 22 is fixedly connected to the lower sliding block 23, so that the lower sliding block 23 is driven to slide through the extension and retraction of the piston rod of the driving cylinder 22.

[0031] Referring to Figure 2 With Figure 3 A through slot is vertically provided on the table top 3, the length direction of the through slot is parallel to the extension direction of the piston rod of the driving cylinder 22, the top end of the lower sliding block 23 extends out of the through slot and protrudes from the table top 3, and two connecting rods 25 are hingedly connected to the top end of the lower sliding block 23, the hinging manner is that two through holes are vertically provided on the top end of the lower sliding block 23 for inserting a hinge shaft, one end of the connecting rod 25 close to the lower sliding block 23 is in a U-shaped groove shape, and the two ends of the U-shaped groove are also provided with through holes matched with the hinge shaft for inserting the hinge shaft, so that the connecting rod 25 and the lower sliding block 23 can be conveniently connected and detached by the technical personnel, and the number of contact point seats 1 participating in the test can be adjusted. One end of the connecting rod 25 away from the lower sliding block 23 extends to between the two contact point seats 1 at one end of the table top 3, and a locking iron 26 is fixedly connected to the one end of the connecting rod 25 away from the lower sliding block 23, the locking iron 26 is in a rectangular plate shape and is vertically arranged on the surface of the contact point seat 1 one by one, and is arranged on the opposite side of the two contact point seats 1 at the same end of the table top 3. Therefore, the one end of the connecting rod 25 away from the lower sliding block 23 extends to between the two locking irons 26 and is hingedly connected to the two locking irons 26, and the hinging manner is the same as the hinging manner between the connecting rod 25 and the lower sliding block 23, that is, the hinge shaft at the end of the connecting rod 25 is inserted into the locking iron 26. Therefore, the connecting rod 25 drives the locking iron 26 to slide synchronously.

[0032] Referring to Figure 3 And Figure 4, the two contact seats 1 opposite side edges of the same end of the table 3 are estimated to have mounting plates 13, the mounting plates 13 are obliquely arranged, the hinge shaft of the movable contact 12 protrudes from the contact seat 1, the contact seat 1 is provided with a waist-shaped slot 16 corresponding to the hinge shaft, a threaded hole is arranged in the center of the surface of the mounting plate 13, the threaded hole is opposite to the part of the hinge shaft of the movable contact 12 protruding from the contact seat 1 and is parallel to the waist-shaped slot 16, a bolt is threadedly connected in the threaded hole, a spring is threadedly connected at the end of the bolt, the spring is fixed by a metal disc at the end of the bolt, preferably welded, the axial direction of the spring is parallel to the direction of the bolt, the part of the hinge shaft of the movable contact 12 protruding from the contact seat 1 is rotationally connected with a roller 14, the wheel shaft of the roller 14 is horizontally arranged and located on the extension line of the spring, and a pin structure is arranged at the top end of the wheel surface of the roller 14 for inserting the bottom end of the spring to fix the spring. The top side of the locking iron 26 is provided with notches at both ends, which are clamping grooves 261, the bottom end of the wheel surface of the roller 14 abuts against the top side of the locking iron 26, and the roller 14 is lowered and slid into the clamping groove 261 when the end of the locking iron 26 is aligned with the roller 14 by sliding the locking iron 26 at the top end along the connecting rod 25 under the action of the spring. In order to fix the spring and abut the roller 14 against the locking iron 26, a rolling groove is arranged in the center of the roller 14, and a clamping ring 15 is rotationally connected with the inside of the rolling groove, and the clamping ring 15 is fixedly connected with the pin structure.

[0033] The implementation principle of the switch machine contact life test bench is that the skilled person first determines the number of contact seats 1 to be connected for testing according to the test situation, drives the lower sliding block 23 to slide by the driving cylinder 22, drives one or two connecting rods 25, and then drives the locking iron 26 to slide.

[0034] Due to the height of the wheel shaft of the movable contact 12 being a preset height and the structure of the top wall of the waist-shaped slot 16, the wheel surface of the roller 14 can abut against the locking iron 26. With the reciprocating sliding of the locking iron 26, the roller 14 rotates under the action of friction, and then drives the movable contact 12 to rotate clockwise and counterclockwise around the bottom hinge shaft to abut against the two static contacts 11 on both sides.

[0035] When the locking iron 26 slides to the slot openings at both ends, the roller 14 is pushed downward along the waist-shaped slot 16 under the action of the spring, so that the wheel surface of the roller 14 abuts against the bottom wall of the clamping groove 261. The locking iron 26 has a preset length, when the above-mentioned movable contact 12 abuts against the static contact 11 on one side, the roller 14 is lowered by the clamping groove 261, and then the movable contact 12 is lowered, so that the contact rod of the movable contact 12 stably and effectively abuts against the two contact pieces of the static contact 11.

[0036] The above-mentioned process is repeated ten million times or one million times under the rapid and efficient pushing of the driving cylinder 22 to complete the contact life test process.

[0037] In another aspect, the embodiment of the present application discloses a test circuit of a switch machine contact life test bench, which is applied to the switch machine contact life test. Figure 5 The test circuit of the switch machine contact life test bench comprises a U / E / PE protection circuit, which connects the installation assembly on the contact life test bench with the protection line. In the embodiment, a U / E / PE protection line system is adopted, and a general switch is arranged on the protection line. When the general switch is turned off, the whole test circuit cannot be grounded, and thus a complete circuit is not formed, which is a circuit breaking state.

[0038] One contact seat 1 on the bench top 3 is taken as an example for illustration in the figure.

[0039] Referring to Figure 5 Two groups of moving contacts 12 and static contacts 11 on a group of contact seats 1 are connected into the protection circuit. The 11, 12, 13, 14, 15 and 16 at the two ends of the contact switch are the line contacts of the two static contacts 11 at the two ends of the contact seat 1. The 21, 22, 23, 24, 25 and 26 are six contacts of two groups of static contacts 11 on another contact seat 1. The moving contact 12 is in the middle state when the contact switch is closed, and the moving contact 12 is in the open state when the contact switch is opened. The part of the protection circuit connected on the two contact seats 1 is provided with switches QF3 and QF4, which can be turned on and off at any time when one contact of the two contact seats 1 does not need to participate in the test, thereby improving the operability.

[0040] Referring to Figure 5 The two ends of each group of moving and static contacts 11 of one contact seat 1 are provided with to-contact points. The to-contact points are used for connecting additional power supply or additional current and voltage measuring devices. If the power supply is connected, it is necessary to ensure that the N line of the protection circuit is connected and the U line is disconnected, so as to ensure that the test voltage is the preset voltage and the circuit is grounded. If the measuring device is connected, it is necessary to ensure that the U line and the N line of the protection circuit are connected, so as to provide the rated voltage while grounding. One contact of one contact seat 1 is connected with a single-phase rectifier bridge, which is used for integrating alternating current, so as to test the contact life under alternating current and direct current conditions at the same time. R1 and R2 are variable resistors, which can adjust the current size and serve as one of the necessary experimental conditions.

[0041] Referring to Figure 5 The Siemens PLC is connected into the protection circuit, which is used for controlling the driving cylinder 22. When the to-contact point is connected with the current and voltage measuring device, the measuring device is also connected with the Siemens PLC, and the PLC processes data according to the preset programming file. The PLC is also connected with the control circuit of the driving cylinder 22, and the speed of the piston rod of the driving cylinder 22 is written according to the programming file preset by the technical personnel. In order to protect the PLC, a circuit breaker QF2 is arranged between the connection of the PLC and the protection circuit, which is used for breaking the circuit when the current of the circuit suddenly changes.

[0042] Referring toFigure 5 The control circuit for driving the cylinder 22 and the contact point on the contact point seat 1 are provided with current sensors 4 for monitoring the current value in the test circuit.

[0043] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A switch machine contact life test bench, comprising a contact seat (1), wherein the contact seat (1) is fixed with a plurality of static contacts (11) and a plurality of movable contacts (12) corresponding to the static contacts (11), wherein the bottom ends of the movable contacts (12) are hinged to the contact seat (1), and the movable contacts (12) are evenly distributed at both ends of the contact seat (1), characterized in that: The contact seat (1) is provided with a plurality of contacts and further comprises: A connecting rod (25) is horizontally arranged and slidably connected above the test bench surface (3); a through groove is provided on the test bench surface (3); and a driving member is provided below the test bench surface (3) to drive the connecting rod (25) to slide; A locking iron (26) is connected to one end of the connecting rod (25) and slides horizontally synchronously with the connecting rod (25). One end of the locking iron (26) extends toward the contact seat (1). A slot (261) is provided on the top side of the end of the locking iron (26); The roller (14) is hinged to the contact seat (1), and the hinge shafts of the plurality of movable contacts (12) extend out of the contact seat (1) and are elastically connected to the axle of the roller (14), and the wheel surface of the roller (14) abuts against the top end of the locking iron (26); The test assembly is connected to the static contact (11) via a wire.

2. A switch machine contact life test bench according to claim 1, characterized in that: The driving member includes: A lower slider (23) is vertically arranged and slidably connected in the through groove, with both ends protruding from the top and bottom surfaces of the test bench, and the portion of the lower slider (23) protruding from the table (3) is detachably connected to the plurality of connecting rods (25); The driving cylinder (22) is horizontally arranged on the bottom side of the test bench, and the end of the piston rod is fixedly connected to the lower slider (23).

3. A switch machine contact life test bench according to claim 1, characterized in that: Also includes: The mounting plate (13) is horizontally arranged on the opposite sides of the plurality of contact seats (1) at the same end of the test bench. A spring is arranged on the mounting plate (13) tilted downward, the top end of the spring is connected to the mounting plate (13), and the bottom end is connected to the axle of the roller (14).

4. A test circuit for a switch machine contact life test bench, applied to the switch machine contact life test bench as claimed in claim 2, comprising a control circuit for the driving cylinder (22), characterized in that: Both ends of the plurality of groups of the moving contacts (12) and the static contacts (11) are provided with contacts for accessing the power grid, and the contacts at both ends of the plurality of the moving contacts (12) and the static contacts (11) in one group are connected in parallel; Each group of multiple static contacts (11) and multiple dynamic contacts (12) are provided with contact points at both ends; Also includes; A computing component is used to connect the control circuit of the driving cylinder (22) and each of the contacts.

5. The test circuit of the switch machine contact life test bench according to claim 4 is characterized in that: A group of the movable contacts (12) and the static contacts (11) at one end of the contact seat (1) are connected to a single-phase rectifier bridge; The two groups of movable contacts (12) and the static contacts (11) at both ends of the contact seat (1) are connected to a DC power supply and an AC power supply respectively.

6. The test circuit of the switch machine contact life test bench according to claim 4 is characterized in that: The control circuit of the driving cylinder (22) is connected to a current sensor (4); one side of each group of the moving contacts (12) and the static contacts (11) is connected to a current sensor (4).

7. The test circuit of the switch machine contact life test bench according to claim 5, characterized in that: Also included are a calculation component circuit breaker, a contact base (1) circuit breaker; The computing component circuit breaker is arranged between the computing component and the protection line; The contact seat (1) circuit breaker is arranged between the moving contact (12), the static contact (11) and the protection line.

8. The test circuit of the switch machine contact life test bench according to claim 4 is characterized in that: The contact is connected to a measuring piece, and both ends of the moving contact (12) and the static contact (11) are connected to a protection line.

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