Bidirectional limit switch device for easy remote replacement operation

Abstract

The present invention discloses a bidirectional limit switch device that is convenient for remote replacement operation, which belongs to the technical field of limit control of motion stroke in electromechanical equipment. The device comprises two blocking members, two limit switches, two transmission rods located between the two blocking members, two return springs, four linear bearings, two return fixing members, a limit switch assembly, and a mounting seat. The mounting seat is installed on a moving part and located between the two transmission rods. The limit switch assembly comprises a limit switch seat, which is directly installed on the mounting seat. The two limit switches are respectively installed on the limit switch seat. One end of each transmission rod can approach the limit switch seat and can contact the contact member of the corresponding limit switch, and the other end can approach the corresponding blocking member and contact it. The present invention can achieve the purpose of completing the remote replacement of the limit switch through the transmission member, protect the personal safety of the operator, and the replacement operation is simple, fast and efficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of limit control of motion stroke in electromechanical equipment, and specifically relates to a limit switch device, and more particularly to a bidirectional limit switch device that is convenient for remote replacement operation. Background Art

[0002] Limit switch devices are generally used to limit the movement stroke of equipment or components. Their basic components include blocking members (such as baffles, blocks or raised blocking parts, etc.) and limit switches (also called travel switches, contact sensors, etc.). In application, the blocking members and limit switches are respectively installed on the fixed parts and moving parts of the equipment. Generally, the limit switch is installed on the moving part. When the moving part moves to the limit position, the contact of the limit switch contacts the blocking member and is blocked. The limit switch outputs a signal to the controller, and the controller sends a control signal to stop the moving part from moving, thereby realizing the movement stroke limit control function.

[0003] In most application scenarios, the travel limit control of moving parts is bidirectional control, that is, the movement travel of the moving parts in two opposite directions on the same straight line is limited separately. The limit switch device used is a bidirectional limit switch device, which generally has two blocking members and two limit switches.

[0004] Traditional bidirectional limit switch devices typically use screws to mount two limit switches on either side of a moving component, which fully meets application requirements in general scenarios. However, in some highly contaminated environments, the limit switches are difficult to replace remotely. For example, in the nuclear waste reprocessing industry, a power manipulator is often used to transport and process nuclear waste. As an electrically controlled manipulator, its travel requires limit control to avoid collisions with other equipment at high speeds. Therefore, limit switches are installed at both ends of the mobile bracket on which the power manipulator is mounted.

[0005] For the bidirectional limit switch device in the above-mentioned high-pollution environment, since electronic equipment has varying degrees of shortened lifespan, in order for the equipment to operate stably and reliably, the limit switch needs to be replaced at a fixed time period. If a traditional bidirectional limit switch device is used, there are the following defects: the two limit switches are fixedly installed on the moving parts respectively, and the replacement requires human intervention and installation. Remote replacement cannot be achieved through transmission parts, resulting in safety hazards for operators. In addition, the replacement steps are many, the process is cumbersome, and time-consuming, the replacement operation efficiency is low, and the equipment maintenance cost is increased. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems and provide a bidirectional limit switch device suitable for highly polluted environments and convenient for remote replacement operations.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A two-way limit switch device that is convenient for remote replacement operation, comprising two blocking members and two limit switches, wherein the two blocking members are respectively mounted on a fixed member, the two limit switches are respectively mounted on a movable member, and the two limit switches are located between the two blocking members. The two-way limit switch device that is convenient for remote replacement operation also comprises two transmission rods located between the two blocking members, two reset springs, four linear bearings, two reset fixing members, a limit switch assembly, and a mounting seat, wherein the mounting seat is mounted on the movable member and is located between the two transmission rods. The limit switch assembly comprises a limit switch seat, which is directly installed on the mounting seat, and the two limit switches are located between the two blocking members. The limit switches are respectively installed on the limit switch seats, and the two transmission rods with center lines on the same straight line are respectively installed on the moving parts through the linear bearings. Each of the transmission rods passes through the center through holes of the corresponding two linear bearings. One end of each transmission rod can be close to the limit switch seat and can contact the contact piece of the corresponding limit switch, and the other end can be close to the corresponding blocking piece and contact it. The two reset fixing members are respectively installed on the moving parts and close to the two transmission rods. The two reset springs are respectively installed between the two transmission rods and the corresponding reset fixing members and respectively make the two transmission rods have a reset elastic force away from the limit switch seat.

[0009] Preferably, in order to facilitate the installation of the limit switch and facilitate reliable contact between the transmission rod and the contact piece of the limit switch, an installation groove is provided on the limit switch seat, and the two limit switches are respectively installed in the installation groove near the two ends. After one end of the two transmission rods enters the installation groove respectively, they can contact the corresponding contact piece of the limit switch.

[0010] Preferably, in order to facilitate the transmission of the electrical signal of the limit switch to the controller on the moving part through conductive contact, the limit switch seat is provided with a switch seat wireless contact terminal including a plurality of conductive contacts for transmitting electrical signals, and the switch seat wireless contact terminal is electrically connected to the limit switch, and a mounting seat wireless contact terminal including a plurality of conductive contacts for transmitting electrical signals is provided at a position corresponding to the switch seat wireless contact terminal on the mounting seat, and the mounting seat wireless contact terminal is correspondingly connected to the controller on the moving part, and the mounting seat wireless contact terminal and the switch seat wireless contact terminal can be correspondingly conductively connected.

[0011] Preferably, in order to achieve quick plug-in connection and separation between the limit switch seat and the mounting seat by vertical movement, the axial direction of the transmission rod is horizontal, the length direction of the mounting slot is horizontal, a vertical mounting plate is provided on the upper part of the mounting seat, the two mounting seat wireless contact terminals are provided at the upper end of the mounting seat and the lower part of the mounting plate is located between the two mounting seat wireless contact terminals, the side of the mounting plate close to the moving part protrudes outward to form a connecting portion, the connecting screw passes through the corresponding through holes on the mounting plate and the connecting portion and is connected to the corresponding screw hole on the moving part, a vertically penetrating limit slot is provided on the side of the limit switch seat close to the moving part, a slot wall opening that penetrates both inside and outside and vertically is provided in the middle of the slot wall between the limit slot and the moving part, the mounting plate is placed in the limit slot, the connecting portion passes through the slot wall opening, a docking hook is provided in the middle part of the upper end of the limit switch seat, the two switch seat wireless contact terminals are respectively provided at the lower end of the limit switch seat and are respectively located directly above the two mounting seat wireless contact terminals.

[0012] Preferably, in order to facilitate the temporary positioning function between the limit switch seat and the mounting seat and to have adaptive elasticity to avoid affecting the connection and separation between the two, circular positioning grooves are respectively provided on the outer surface of the groove wall between the limit groove and the movable part, and the positions corresponding to the two positioning grooves on the movable part are respectively installed with glass bead springs, and the glass beads of the glass bead springs can be placed in the corresponding positioning grooves.

[0013] Preferably, in order to avoid damage to the glass bead spring due to prolonged compression contact between the glass bead spring and the limit switch seat during the connection and separation process between the limit switch seat and the mounting seat, vertical strip-shaped clearance grooves with open lower ends are respectively provided on the outer surface of the groove wall between the limit groove and the moving part at positions below the two positioning grooves.

[0014] Preferably, in order to realize a reliable limit control function in which the moving part first slows down and then stops, a third limit switch is further installed in the middle position between the two limit switches in the installation groove. After one end of the two transmission rods enters the installation groove, they can contact the contact piece of the third limit switch, and the third limit switch is electrically connected to the inner end of the wireless contact end of the switch seat.

[0015] Preferably, in order to better protect the limit switch, a protection plate for protecting the limit switch is installed on the limit switch seat near the mounting groove.

[0016] Preferably, in order to better enable the transmission rod to have a reset elastic force away from the limit switch seat, a convex ring protruding toward the outer circumference is provided on the transmission rod at a position between the corresponding two linear bearings, and the convex ring is located between the corresponding reset fixing piece and the corresponding linear bearing close to the limit switch seat. The reset spring is sleeved on the outside of the transmission rod and is located between the corresponding convex ring and the corresponding linear bearing close to the limit switch seat. The reset spring is a compression spring.

[0017] The beneficial effects of the present invention are:

[0018] The present invention achieves a normal triggering function by centrally installing two or three limit switches on a limit switch base, and installing movable and resettable transmission rods outside the two ends of the limit switch base. The transmission rods are used to transmit the trigger power signal of the contact between the moving part and the blocking part when the moving part approaches the limit position to the corresponding limit switch, thereby realizing the normal triggering function, and the mounting base is installed on the moving part, and the limit switch base is directly installed on the mounting base. When replacing the limit switch, it is only necessary to use a long-distance transmission part similar to a long rod to pull the limit switch base out of or insert it into the mounting base to realize the separation or connection function between the limit switch base and the mounting base, thereby achieving the purpose of completing the remote replacement of the limit switch through the transmission part, without the operator directly contacting the limit switch base and the limit switch, the operator can operate outside the highly polluted space, thereby protecting the personal safety of the operator, and the replacement operation is simple, fast and efficient, and reduces the equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view of the bidirectional limit switch device that facilitates remote replacement operation according to the present invention when in use;

[0020] Figure 2 This is one of the three-dimensional views of the limit switch base of the bidirectional limit switch device that is convenient for remote replacement operation according to the present invention;

[0021] Figure 3 This is the second perspective view of the limit switch seat of the bidirectional limit switch device that is convenient for remote replacement operation according to the present invention, and Figure 2 The perspective is different;

[0022] Figure 4 This is the third perspective view of the limit switch seat of the bidirectional limit switch device that is convenient for remote replacement operation according to the present invention, and Figure 2 and Figure 3 The perspectives are different;

[0023] Figure 5 It is a partially cutaway perspective view of the bidirectional limit switch device that facilitates remote replacement operation according to the present invention when in use;

[0024] Figure 6 It is a partial stereoscopic view of the connection and separation of the limit switch seat and the mounting seat of the bidirectional limit switch device that is convenient for remote replacement operation according to the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] like Figures 1-6 As shown, the bidirectional limit switch device for facilitating remote replacement operation of the present invention comprises two blocking members 1 ( Figure 1 Only one blocking member 1 is shown, and the other blocking member 1 is located at the distal end of the fixed member 8 and is not visible in the figure), two limit switches 72 and two transmission rods 2 located between the two blocking members 1, two reset springs 5, four linear bearings 6, two reset fixing members 3, a limit switch assembly 7, and a mounting seat 16. The two blocking members 1 are respectively installed on the fixed member 8, and the two limit switches 72 are respectively installed on the moving member 9. The two limit switches 72 are located between the two blocking members 1. The mounting seat 16 is installed on the moving member 9 and is located between the two transmission rods 2. The limit switch assembly 7 includes a limit switch seat 70, and the limit switch seat 70 is directly installed on the mounting seat 16. The two limit switches 72 are respectively installed on the limit switch seat 70, and the two transmission rods 2 whose center lines are located on the same straight line are respectively installed on the moving part 9 through the linear bearings 6. Each transmission rod 2 passes through the center through hole of the corresponding two linear bearings 6. One end of each transmission rod 2 can be close to the limit switch seat 70 and can contact the contact piece of the corresponding limit switch 72, and the other end can be close to the corresponding blocking piece 1 and contact it. The two reset fixing members 3 are respectively installed on the moving part 9 and are respectively close to the two transmission rods 2. The two reset springs 5 ​​are respectively installed between the two transmission rods 2 and the corresponding reset fixing members 3 and respectively give the two transmission rods 2 a reset elastic force away from the limit switch seat 70. Figure 1 Also shown are rollers (not marked in the figure) provided on the movable component 9. The two rollers are respectively placed on the tracks of the fixed component 8 to realize the rolling movement of the movable component 9. This is a conventional structure designed according to application needs. The above-mentioned movable component 9 and fixed component 8 are determined according to the actual electromechanical equipment used. The present invention does not limit the specific structure and application equipment of the movable component 9 and the fixed component.

[0027] like Figures 1-6 As shown, the present invention also discloses the following multiple more optimized specific structures:

[0028] In order to facilitate the installation of the limit switch 72 and facilitate reliable contact between the transmission rod 2 and the contact piece of the limit switch 72, a mounting groove 71 is provided on the limit switch seat 70, and the two limit switches 72 are respectively installed in the mounting groove 71 near the two ends. After one end of the two transmission rods 2 enters the mounting groove 71, they can contact the corresponding contact piece of the limit switch 72.

[0029] In order to facilitate the transmission of the electrical signal of the limit switch 72 to the controller on the moving part 9 (not visible in the figure) through conductive contact, the limit switch base 70 is provided with a switch base wireless contact terminal 77 including multiple conductive contacts for transmitting electrical signals. The switch base wireless contact terminal 77 is electrically connected to the limit switch 72. The mounting base 16 is provided with a mounting base wireless contact terminal 13 including multiple conductive contacts for transmitting electrical signals at a position corresponding to the switch base wireless contact terminal 77. The mounting base wireless contact terminal 13 is correspondingly connected to the controller on the moving part 9, and the mounting base wireless contact terminal 13 and the switch base wireless contact terminal 77 can be correspondingly conductively connected.

[0030] In order to realize the quick plug-in connection and separation between the limit switch seat 70 and the mounting seat 16 by vertical movement, the axial direction of the transmission rod 2 is horizontal, the length direction of the mounting groove 71 is horizontal, and a vertical mounting plate 15 is provided on the upper part of the mounting seat 16. The two mounting seat wireless contact ends 13 are provided at the upper end of the mounting seat 16 and the lower part of the mounting plate 15 is located between the two mounting seat wireless contact ends 13. The side of the mounting plate 15 close to the moving part 9 protrudes outward to form a connecting portion 10. The connecting screw (not marked in the figure) passes through the mounting plate 15 and the connecting portion 10 The corresponding through-hole on the upper surface is connected to the corresponding screw hole on the movable part 9. A vertically penetrating limit slot 76 is provided on the side of the limit switch base 70 near the movable part 9. A slot wall opening 75 that penetrates both internally and externally and vertically is provided in the middle of the slot wall between the limit slot 76 and the movable part 9. The mounting plate 15 is placed in the limit slot 76, and the connecting portion 10 passes through the slot wall opening 75. A docking hook 74 is provided in the middle of the upper end of the limit switch base 70. Two switch base wireless contact terminals 77 are respectively provided at the lower end of the limit switch base 70 and are respectively located directly above the two mounting base wireless contact terminals 13. The two switch base wireless contact terminals 77 and the two mounting base wireless contact terminals 13 are redundant designs, equivalent to two sets of identical electrical connection components, each set of electrical connection components including a corresponding switch base wireless contact terminal 77 and a mounting base wireless contact terminal 13.

[0031] In order to facilitate the temporary positioning function between the limit switch seat 70 and the mounting seat 16 and have adaptive elasticity to avoid affecting the connection and separation between the two, circular positioning grooves 78 are respectively provided on the outer surface of the groove wall between the limit groove 76 and the movable part 9 at positions on both sides of the groove wall opening 75, and glass bead springs 12 are respectively installed at positions corresponding to the two positioning grooves 78 on the movable part 9, and the glass beads 11 of the glass bead springs 12 can be placed in the corresponding positioning grooves 78.

[0032] In order to avoid damage to the glass bead spring 12 due to prolonged compression contact between the glass bead 11 of the glass bead spring 12 and the limit switch seat 70 during the connection and separation process between the limit switch seat 70 and the mounting seat 16, a vertical strip-shaped clearance groove 79 with an open lower end is provided on the outer surface of the groove wall between the limit groove 76 and the movable part 9 below the two positioning grooves 78.

[0033] In order to realize the reliable limit control function of slowing down and then stopping the moving part 9, a third limit switch 72 is installed in the middle position between the two limit switches 72 in the installation groove 71. After one end of the two transmission rods 2 enters the installation groove 71, they can contact the contact piece of the third limit switch 72. The third limit switch 72 is electrically connected to the inner end of the wireless contact end 77 of the switch seat.

[0034] In order to better protect the limit switch 72 , a protection plate 73 for protecting the limit switch 73 is installed on the limit switch seat 70 near the mounting groove 71 .

[0035] In order to better enable the transmission rod 2 to have a reset elastic force away from the limit switch seat 70, a convex ring 4 protruding toward the outer circumferential direction is provided on the transmission rod 2 at a position between the corresponding two linear bearings 6. The convex ring 4 is located between the corresponding reset fixing piece 3 and the corresponding linear bearing 6 close to the limit switch seat 70. The reset spring 5 is sleeved on the outside of the transmission rod 2 and is located between the corresponding convex ring 4 and the corresponding linear bearing 6 close to the limit switch seat 70. The reset spring 5 is a compression spring.

[0036] like Figures 1-6As shown, when in use, the moving part 9 rolls on the track of the fixed part 8 through the roller. When the moving part 9 moves to the extreme position near one end, the corresponding transmission rod 2 will contact the corresponding blocking member 1 and be blocked by the blocking member 1. The blocking member 1 gives the transmission rod 2 a reaction force, which enables the transmission rod 2 to overcome the elastic force of the return spring 5 and move toward the limit switch seat 70. When one end of the transmission rod 2 moves to contact with a contact piece of a limit switch 72, the limit switch 72 is triggered, causing it to send a signal and transmit it to the controller on the moving part 9 through the corresponding switch seat wireless contact end 77 and the mounting seat wireless contact end 13. , then the driving component (not shown in the figure) of the mobile component 9 is controlled to cause the mobile component 9 to start to slow down (if there is no third limit switch 72, it will stop running directly). When one end of the transmission rod 2 moves to contact the contact piece of the third limit switch 72 (i.e., the limit switch 72 in the middle position), the limit switch 72 is triggered to send a signal and transmit it to the controller on the mobile component 9 through the corresponding switch seat wireless contact end 77 and the mounting seat wireless contact end 13. Then, the driving component (not shown in the figure) of the mobile component 9 is controlled to stop the mobile component 9, thereby realizing the motion stroke limit control function of the mobile component 9. The reverse motion stroke limit control process of the mobile component 9 is similar to this and will not be repeated here.

[0037] When the limit switch 72 needs to be replaced, the operator outside the equipment room docks the docking hook 74 with a long-distance transmission member 14 similar to a long rod (it can also be other components as long as it can achieve this function) (for example, the operator extends the long rod downward from the observation window or maintenance port on the top of the workshop to dock with the docking hook 74), and then uses manual or lifting equipment to pull out the limit switch seat 70 from the mounting seat 16, thereby realizing the separation function between the limit switch seat 70 and the mounting seat 16; after the operator replaces and installs the limit switch 72 on the limit switch seat 70 outside, the operator docks the docking hook 74 with the long-distance transmission member 14, and then uses manual or lifting equipment to insert the limit switch seat 70 from the mounting seat 16, thereby realizing the connection function between the limit switch seat 70 and the mounting seat 16, thus completing the replacement and maintenance work of the limit switch. The operator can operate outside the highly polluted space, thereby protecting the personal safety of the operator. In addition, the replacement operation is simple, fast, efficient, and reduces the equipment maintenance cost.

[0038] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A bidirectional limit switch device that facilitates remote replacement operations, comprising two blocking members and two limit switches, wherein the two blocking members are respectively mounted on a fixed member, the two limit switches are respectively mounted on a movable member, and the two limit switches are located between the two blocking members, characterized in that: The bidirectional limit switch device that facilitates remote replacement operation also includes two transmission rods located between the two blocking members, two return springs, four linear bearings, two return fixing members, a limit switch assembly, and a mounting base. The mounting base is installed on the movable member and located between the two transmission rods. The limit switch assembly includes a limit switch base, which is directly installed on the mounting base. The two limit switches are respectively installed on the limit switch base. The two transmission rods whose center lines are located on the same straight line are respectively installed on the movable member through the linear bearings. Each transmission rod passes through the center through hole of the corresponding two linear bearings. One end of each transmission rod can approach the limit switch base and can contact the contact member of the corresponding limit switch, and the other end can approach the corresponding blocking member and contact it. The two return fixing members are respectively installed on the movable member and respectively approach the two transmission rods. The two return springs are respectively installed between the two transmission rods and the corresponding return fixing members and respectively give the two transmission rods a return elastic force away from the limit switch base.

2. The bidirectional limit switch device that facilitates remote replacement operation according to claim 1 is characterized in that: The limit switch seat is provided with a mounting groove, and the two limit switches are respectively installed in the mounting groove near the two ends. After one end of the two transmission rods enters the mounting groove respectively, they can contact the contact pieces of the corresponding limit switches.

3. The bidirectional limit switch device that facilitates remote replacement operation according to claim 2 is characterized in that: The limit switch seat is provided with a switch seat wireless contact terminal including multiple conductive contacts for transmitting electrical signals, and the switch seat wireless contact terminal is electrically connected to the limit switch. A mounting seat wireless contact terminal including multiple conductive contacts for transmitting electrical signals is provided at a position corresponding to the switch seat wireless contact terminal on the mounting seat, and the mounting seat wireless contact terminal is correspondingly connected to the controller on the moving part. The mounting seat wireless contact terminal and the switch seat wireless contact terminal can be correspondingly conductively connected.

4. The bidirectional limit switch device that facilitates remote replacement operation according to claim 3 is characterized in that: The cam is secured to the upper edge of the ladder handle and has a lockhole that is secured on both sides of the ladder by a secure hook, and the ladder handle is locked in place when the ladder handle is engaged, and the ladder handle is locked.

5. The bidirectional limit switch device that facilitates remote replacement operation according to claim 4 is characterized in that: Circular positioning grooves are respectively provided on the outer surface of the groove wall between the limiting groove and the movable part at positions on both sides of the groove wall opening, and glass bead springs are respectively installed at positions corresponding to the two positioning grooves on the movable part, and the glass beads of the glass bead springs can be placed in the corresponding positioning grooves.

6. The bidirectional limit switch device that facilitates remote replacement operation according to claim 5, characterized in that: Vertical strip-shaped clearance grooves with open lower ends are respectively provided at positions below the two positioning grooves on the outer surface of the groove wall between the limiting groove and the moving part.

7. The bidirectional limit switch device for facilitating remote replacement operation according to any one of claims 3 to 6, characterized in that: A third limit switch is also installed in the middle position between the two limit switches in the installation groove. After one end of the two transmission rods enters the installation groove, they can contact the contact piece of the third limit switch. The third limit switch is electrically connected to the inner end of the wireless contact end of the switch seat.

8. The bidirectional limit switch device for facilitating remote replacement operation according to any one of claims 2 to 6, characterized in that: A protection plate for protecting the limit switch is installed on the limit switch seat near the installation slot.

9. The bidirectional limit switch device for facilitating remote replacement operation according to any one of claims 1 to 6, characterized in that: A convex ring protruding toward the outer circumference is provided on the transmission rod at a position between the corresponding two linear bearings. The convex ring is located between the corresponding reset fixing piece and the corresponding linear bearing close to the limit switch seat. The reset spring is sleeved outside the transmission rod and located between the corresponding convex ring and the corresponding linear bearing close to the limit switch seat. The reset spring is a compression spring.

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