A high current push rod stroke end limit control system and electric push rod

Abstract

The present invention provides a high-current push rod stroke end limit control system, including a drive circuit and a control circuit connected to the same power supply, the drive circuit including a motor, the drive circuit and the control circuit are both connected to a first relay and a second relay; the control circuit controls the drive circuit to drive the motor to run forward, reverse or brake through the first relay and the second relay; the relay is provided to effectively isolate the high current between the control circuit and the drive circuit, avoid damage to components caused by the high current, and also reduce the volume of the travel switch, so as to realize the function of allowing the push rod motor to be powered by a high current. The present invention also provides an electric push rod, which facilitates the wiring of the internal control system and the installation of the push rod as a whole by providing a unique housing component, power component and control component in the circumferential matching direction, thereby improving the fault tolerance and efficiency of the push rod assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and in particular to a high-current push rod control system and an electric push rod using the system. Background Art

[0002] Electric linear actuator is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the actuator. It is used in various simple or complex process flows as an electric actuator to achieve remote control, centralized control or automatic control. Electric linear actuator is widely used in power, machinery, metallurgy, transportation, coal, chemical industry, grain and feed processing machinery and other departments, and is very popular among users.

[0003] Chinese patent CN217159572U discloses that the present application discloses a DC motor type electric push rod control system, including a motor, two relay modules, a control module and a power supply module, the two relay modules are connected to both ends of the motor, the relay module includes a relay coil and a switch component, the control module is respectively connected to the two relay coils and the power supply module, the control module is suitable for controlling the switch component to make the motor rotate forward or reverse through the two relay coils, the control module is suitable for controlling the power supply module switch, the control module and the power supply module are respectively connected to the two switch components, the power supply module is suitable for supplying power to the switch component, the control module is suitable for collecting the current value flowing through the switch component, and if the control module collects the current value flowing through the switch component before controlling the switch component to act, the power supply module is controlled to be closed. The system can realize the electronic control of the switch contacts, and the relay can be powered off to perform the switch contact action, so as to avoid spark oxidation caused by the live activity of the switch contacts and improve the service life.

[0004] However, this technical solution has the following problems: its control module and the motor are connected in series to protect the motor from overcurrent, which limits the current flowing through the motor. When the voltage remains unchanged, the working power of the motor is low. When the load is large or the speed is fast, the internal circuit cannot withstand the large current brought by the operation of the high-power motor, and problems such as internal circuit burning or even spontaneous combustion may occur, which cannot meet work requirements. Summary of the invention

[0005] One of the purposes of the present invention is to address the deficiencies in the prior art and provide a high-current push rod stroke end limit control system. By setting a relay, the high current between the control circuit and the drive circuit is effectively isolated, which can not only avoid burning out of components in the circuit, but also reduce the volume occupied by the travel switch, thereby realizing the function of allowing the push rod motor to be powered by a large current, and solving the problem of insufficient motor power when the load is large.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-current push rod stroke end limit control system, characterized in that it includes a drive circuit and a control circuit connected to the same power supply, the drive circuit includes a motor, the drive circuit and the control circuit are electrically connected to a first relay and a second relay, the first relay and the second relay each include a pin 3 and a pin 4 for controlling on and off, and a pin 1, a pin 2 and a pin 5 for controlling on and off of a controlled switching circuit;

[0008] The control circuit controls the drive circuit through the first relay and the second relay to drive the motor to run forward, reverse or brake.

[0009] As a preferred embodiment, the motor includes an electrode M1 and an electrode M2, the pin 5 of the first relay and the pin 2 of the second relay are connected to the electrode M1 of the motor, the pin 1 of the first relay and the pin 5 of the second relay are connected to the electrode M2 ​​of the motor; the pin 2 of the first relay and the pin 1 of the second relay are respectively connected to the two poles of the power supply.

[0010] As a preferred embodiment, the control circuit further includes a first control branch, a second control branch, a control switch, a rectifier module and a buck module which are electrically connected;

[0011] The control switch input end is electrically connected to the power source U, and the output end is electrically connected to the input end of the first control branch to control the on and off of the first control branch;

[0012] The rectifier module includes an input end connected to a power supply, and an output end connected to the second control branch and the step-down module, and provides a stable current when turned on.

[0013] As a preferred embodiment, the control switch includes a contact SW1 and a contact SW3 connected to the power source U, and a contact SW2 and a contact SW4 connected to the first control branch;

[0014] The rectifier module includes pins 1 and 2 connected to a power source, a pin 3 for output, and a pin 4 for grounding.

[0015] Preferably, the first control branch comprises a first transistor, a base of the first transistor being electrically connected to contacts SW2 and SW4 of the control switch, a collector being connected to pin 4 of the first relay and an output end of the buck module, and an emitter being grounded.

[0016] Preferably, the second control branch comprises a second transistor, the base of the second transistor is electrically connected to pin 3 of the rectifier module, the collector is connected to pin 4 of the second relay and the output end of the buck module, and the emitter is grounded.

[0017] As a preference, resistors are connected between the bases and emitters of the first transistor and the second transistor, and a capacitor is additionally connected between the base and emitter of the first transistor.

[0018] As a preferred embodiment, pin 2 of the first relay, contact SW1 of the control switch and pin 2 of the rectifier module are connected to one pole of the power supply, and pin 1 of the second relay, contact SW3 of the control switch and pin 1 of the rectifier bridge are connected to the other pole of the power supply, and the two poles of the power supply can be set interchangeably.

[0019] Another object of the present invention is to provide a high-current push rod, which facilitates the wiring of the internal control system and the installation of the push rod as a whole by providing a unique housing component, power component and control component in the circumferential matching direction, thereby improving the assembly efficiency of the push rod.

[0020] To achieve the above object, the present invention provides the following technical solutions:

[0021] An electric push rod, characterized in that it includes a shell component that is unique in the circumferential mating direction, a power component installed in the shell component, and a control component, and is characterized in that it also includes a high-current push rod stroke end limit control system as described in the above scheme; the control component includes a control board, a stroke limit unit and a wiring harness, the control system is integrated on the control board, the stroke limit unit is electrically connected to the control board through three lead wires to realize the disconnection and connection actions of the contacts SW1 and SW3 connected to the power supply U in the control switch of the control system with the corresponding contacts SW2 and SW4 respectively; one end of the wiring harness is connected to an external power supply, and the other end is connected to the control board, and the control board is electrically connected to the drive unit.

[0022] As a further preference, the control board is also provided with three wire threading holes and two power connection ports, and three lead wires linearly pass through the corresponding wire threading holes and converge into the wiring harness, and the positive and negative poles at the other end of the wiring harness are electrically connected to the two power connection ports respectively; the control board is also provided with connection interfaces for respectively correspondingly electrically connecting the electrodes M1 and M2 of the motor; the rectifier module and the buck module are integrated on the control board.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention effectively isolates the large current of the drive circuit by using the first relay and the second relay, and enables the drive circuit to form a loop independently when using the same power supply, which can not only prevent the components in the circuit from burning out, but also reduce the volume occupied by the travel switch, thereby improving the safety and reliability of the system; at the same time, the control system of the present invention can provide a small braking amplitude when the motor is powered off when the push rod does not touch the limit switches at both ends, so as to reduce the push rod from continuing to move due to the motor rotor continuing to rotate under inertia after power failure, thereby improving the mid-way power-off braking capability and operation accuracy of the push rod;

[0025] (2) The present invention ensures that the current provided to the step-down module and the second control branch is stable and meets the working voltage requirements through the application of the rectifier module, thereby avoiding the influence of voltage fluctuation on system performance and improving the stability of the system;

[0026] (3) The present invention connects a capacitor between the base and emitter of the first transistor, so that the first control branch has a delayed switching function, which makes the motor run more smoothly when turning on and off; the present invention facilitates the wiring of the internal control system and the installation of the push rod as a whole by providing a housing component, a power component and a control component with only one circumferential matching direction, thereby improving the fault tolerance and efficiency of the push rod assembly.

[0027] In summary, the present invention has the advantages of high safety, reliability and stability, and is suitable for high-current push rods; the system has high assembly efficiency when installed in a push rod with only one circumferential assembly direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0029] Figure 2 Schematic diagram of the system circuit of the present invention;

[0030] Figure 3 This is a schematic diagram of the rectifier module circuit of the present invention;

[0031] Figure 4 This is a schematic diagram of the step-down module circuit of the present invention;

[0032] Figure 5 This is a circuit diagram of the operating state of the present invention;

[0033] Figure 6 This is a schematic diagram of the circuit in the stop state of the present invention;

[0034] Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0035] Figure 8 This is a schematic cross-sectional view of the structure of Embodiment 2 of the present invention;

[0036] Fig. 9 This is a schematic cross-sectional isometric diagram of a second embodiment of the present invention;

[0037] Fig.10 This is another cross-sectional structural schematic diagram of the second embodiment of the present invention;

[0038] Fig.11 This is a schematic diagram of the explosion structure of the second embodiment of the present invention;

[0039] Fig.12 Embodiment 2 of the present invention Fig.11 The local enlarged schematic diagram of point I in the middle;

[0040] Fig.13 The schematic diagram of the structure of the bearing seat in the second embodiment of the present invention from top and bottom views;

[0041] Fig.14 This is a schematic diagram of the structure of a drive unit and a mounting plate according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] Embodiment 1

[0045] like Figure 1-6As shown, this embodiment provides a high-current push rod stroke end limit control system, including a drive circuit 1 and a control circuit 2 connected to the same power supply, the drive circuit 1 includes a motor 11, the drive circuit 1 and the control circuit 2 are both connected to a first relay 3 and a second relay 4, the first relay 3 and the second relay 4 both include pins 3 and 4 for controlling on and off, and pins 1, 2 and 5 for controlling on and off of the controlled switching circuit; the control circuit 2 controls the drive circuit 1 through the first relay 3 and the second relay 4 to drive the motor 11 to run forward, reverse or brake. It should be noted that in this embodiment, the power supply is selected as a 9-24V DC power supply. When the power is not on, the pins 5 of the first relay 3 and the second relay 4 are connected to the pin 2, and are both in a normally closed state; the maximum current allowed to pass through a conventional switch is generally 12A. In this embodiment, a relay is used instead of a conventional switch to increase the upper limit of the current allowed to pass.

[0046] By using the first relay 3 and the second relay 4, the large current of the drive circuit 1 is effectively isolated. When using the same power supply, the drive circuit 1 and the control circuit 2 can each form a circuit independently, which can not only avoid the burning of components in the circuit, but also reduce the volume occupied by the travel switch, thereby improving the safety and reliability of the system.

[0047] like Figure 2 As shown, the motor 11 includes an electrode M1 and an electrode M2, the pin 5 of the first relay 3 and the pin 2 of the second relay 4 are connected to the electrode M1 of the motor 11, the pin 1 of the first relay 3 and the pin 5 of the second relay 4 are connected to the electrode M2 ​​of the motor 11; the pin 2 of the first relay 3 and the pin 1 of the second relay 4 are respectively connected to the two poles of the power supply.

[0048] like Figure 2-4 As shown, the control circuit 2 also includes an electrically connected first control branch 21, a second control branch 22, a control switch 23, a rectifier module 24 and a step-down module 25; the input end of the control switch 23 is electrically connected to the power supply U, and its output end is electrically connected to the input end of the first control branch 21 to control the on and off of the first control branch 21.

[0049] The rectifier module 24 includes an input end electrically connected to the power source U, and an output end electrically connected to the second control branch 22 and the step-down module 25, and provides a stable current when connected. In this embodiment, the rectifier module 24 is a rectifier bridge, and even if the positive and negative directions of the power source change, it always outputs a positive 12V or 24V direct current, providing a positive voltage for the step-down module 25 and the second control branch 22.

[0050] like Figure 4As shown, the step-down module 25 includes a step-down chip 251, wherein a capacitor C1 and a resistor R1 are electrically connected between the interface 1 and the interface 6 of the step-down chip 251, and the output end of the interface 6 is connected to the output end VC of the step-down module 25, the interface 2 and the interface 3 of the step-down chip 251 are both grounded, a resistor R2 is provided between the interface 3 and the output end VC of the step-down module 25, the interface 5 is electrically connected to the output end VC of the rectifier module 24, a resistor R3 is electrically connected between the interface 4 and the interface 5, and a capacitor C2 is also provided between the interface 5 and the output end VC of the rectifier module 24 and is grounded; a power inductor L1 is also electrically connected between the interface 6 and the output end VC of the step-down module 25, the input end of the power inductor L1 is electrically connected to the unidirectional diode D2 and is grounded, and its output end is electrically connected to the capacitor C3 and is grounded.

[0051] The application of the rectifier module 24 ensures that the current provided to the step-down module 25 and the second control branch 22 is stable and meets the working voltage requirements, thereby avoiding the impact of voltage fluctuations on system performance and improving system stability.

[0052] like Figure 2 As shown, the control switch 23 includes contacts SW1 and SW3 connected to the power supply U, and SW2 and SW4 connected to the first control branch 21, and a resistor R5 is also provided between the contacts SW1 and SW3 and the two poles of the power supply U; the rectifier module 24 includes two pins connected to the power supply, a pin 3 for output, and a pin 4 for grounding.

[0053] like Figure 2-4 As shown, the first control branch 21 includes a first triode 211, the base of the first triode 211 is electrically connected to the contact SW2 and the contact SW4 of the control switch 23, the collector is connected to the pin 4 of the first relay 3 and the output end of the step-down module 25, and the emitter is grounded. The second control branch 22 includes a second triode 221, the base of the second triode 221 is electrically connected to the pin 3 of the rectifier module 24, the collector is connected to the pin 4 of the second relay 4 and the output end of the step-down module 25, and the emitter is grounded.

[0054] like Figure 2 As shown, a resistor 212 is connected between the base and emitter of the first transistor 211 and the second transistor 221, and a capacitor 213 is additionally connected between the base and emitter of the first transistor 211, so that the first control branch 21 has the function of a delayed switch. In this embodiment, the delay time of the capacitor 213 is 12ms.

[0055] It should be noted that since the lead screw, connection position, gear box of the reduction mechanism, etc. in the push rod have return errors in the circumferential direction, there will be a slight retraction when the push rod stops during extension. In addition, the end limit switches of the stroke in this embodiment are all equipped with a brake function, which will stop directly after being triggered. At this time, the retraction caused by the structural return error may cause the switch to disconnect and then be triggered again, and then the motor starts and continues to move for a short time and triggers the switch again, and then retracts; this embodiment sets the first control branch 21 with a delay function, and sets the delay trigger movement distance to be greater than the retraction distance caused by the return error to avoid the above-mentioned problems. In actual production, if the push rod structure, parts manufacturing process, performance parameters, etc. change, the delay time needs to be readjusted to avoid overshoot due to too long time, or too short time to compensate for the retraction distance.

[0056] like Figure 2-4 Described, pin 2 of the first relay 3, contact SW1 of the control switch 23 and pin 2 of the rectifier module 24 are connected to one pole of the power supply, and pin 1 of the second relay 4, contact SW3 of the control switch 23 and pin 1 of the rectifier bridge are connected to the other pole of the power supply, and the two poles of the power supply can be interchangeably arranged.

[0057] The control system in this embodiment can realize three control states, one of which is the power-off state, such as Figure 2 As shown, at this time, pin 5 of the second relay 4 is connected to pin 2, and the electrode M1 of the motor 11 returns to the electrode M2 ​​of the motor 11 through pins 2 and 5 to form a loop. The two ends of the motor 11 are short-circuited and are in a self-locking state. Therefore, the control system of the present invention can provide a small braking amplitude when the motor is powered off when the push rod does not touch the limit switches at both ends, so as to reduce the continued movement of the push rod caused by the continued rotation of the motor rotor under inertia after power failure, thereby improving the mid-way power-off braking ability and operation accuracy of the push rod.

[0058] like Figure 5 and 6 As shown, the second is the forward running state, that is, the motor 11 rotates forward to drive the push rod connected to it to extend, and the motor 11 can be operated or stopped by changing the connection state of the control switch 23; at this time, the power supply electrode connected to the pin 2 of the first relay 3, the contact SW1 of the control switch 23 and the pin 2 of the rectifier module 24 is positive, and the second transistor 221 is turned on to energize the second relay 4, and its pin 5 is connected to the pin 1. If the contact SW1 and the contact SW2 of the control switch 23 are disconnected, regardless of whether the contact SW3 and the contact SW4 of the control switch 23 are connected, the first transistor 211 is not turned on, and the pin 5 of the first relay 3 is connected to the pin 2, the electrode M1 of the motor 11 is connected to the positive electrode of the power supply through the pin 5 and the pin 2 of the first relay 3, and the electrode M2 ​​of the motor 11 is connected to the negative electrode of the power supply through the pin 5 and the pin 1 of the second relay 4, forming a loop, as shown in FIG. Figure 5 The bold part indicates that the motor 11 rotates forward; if the contact SW1 and the contact SW2 of the control switch 23 are connected and the contact SW3 and the contact SW4 are disconnected during operation, the first transistor 211 is turned on, and the electrode M1 of the motor 11 returns to the electrode M2 ​​of the motor 11 through the pins 5 and 1 of the first relay 3, as shown in FIG. Figure 6 The bold part shows that the motor 11 is braked.

[0059] like Figure 5 and 6 As shown, the third is the reverse operation state, that is, the motor 11 rotates in the reverse direction to drive the push rod connected to it to retract, and the motor 11 can be operated or stopped by changing the connection state of the control switch 23; at this time, the power supply electrode connected to the pin 1 of the second relay 4, the contact SW3 of the control switch 23 and the pin 1 of the whole module 24 is positive, and the second transistor 221 is turned on to energize the second relay 4, and its pin 5 is connected to the pin 1. If the contact SW3 and the contact SW4 of the control switch 23 are disconnected, regardless of whether the contact SW1 and the contact SW2 of the control switch 23 are connected, the first transistor 211 is not turned on, and the pin 5 of the first relay 3 is connected to the pin 2, and the electrode M2 ​​of the motor 11 is connected to the positive electrode of the power supply through the pin 5 and the pin 1 of the second relay 4, and the electrode M1 of the motor 11 is connected to the negative electrode of the power supply through the pin 5 and the pin 2 of the first relay 3, forming a loop, as shown in FIG. Figure 4 The bold part indicates that the motor 11 is reversed; if the contact SW3 and the contact SW4 of the control switch 23 are connected and the contact SW1 and the contact SW2 are disconnected during operation, the first transistor 211 is turned on, and the electrode M1 of the motor 11 is returned to the electrode M2 ​​of the motor 11 through the pins 5 and 1 of the first relay 3, as shown in FIG. Figure 6 The bold part shows that the motor 11 is braked.

[0060] The above three states of this embodiment are descriptions of the functions and implementation methods of the present invention, and do not limit the specific usage scenarios of the control system. The forward and reverse operation of the motor 11 depends on the specific needs of the customer to freely adjust the positive and negative poles of the power supply.

[0061] Embodiment 2

[0062] like Figure 7-14 As shown, this embodiment provides a high-current push rod, including a housing assembly 5, a power assembly 6 and a control assembly 7 installed in the housing assembly 5, and also includes a high-current push rod control system described in the above-mentioned embodiment 1. The housing assembly 5, the power assembly 6 and the control assembly 7 have a unique circumferential matching direction, so that the installation positions of the components are unified, and there will be no installation misalignment, which avoids rework of the push rod and improves the fault tolerance and efficiency of workers assembling the push rod.

[0063] like Figure 8and 11 As shown, the power assembly 6 at least includes a drive unit 61 and a bearing seat 62. In this embodiment, the drive unit 61 includes the motor 11 described in Example 1 and a reduction mechanism that is transmission-connected to the drive end of the motor 11, which is not shown in the figure. The drive end of the drive unit 61 is mounted on the inner end surface of the bearing seat 62 through a mounting plate 63. An insulating sleeve 64 is installed at the rear end of the drive unit 61. The mounting plate 63 is connected to the drive unit 61 through a number of circumferentially evenly distributed fasteners.

[0064] like Fig. 9 As shown, the rear end of the driving unit 61 is provided with a first notch 611 , and the insulating sleeve 64 is provided with a first mounting structure 641 matched with the first notch 611 .

[0065] like Figure 8 , 11 As shown, the control assembly 7 includes a control board 71, a travel limit unit 72 and a wiring harness 73. The control board 71 is installed on the outside of the insulating sleeve 64, and the control system described in the first embodiment is integrated on the control board 71; the travel limit unit 72 is electrically connected to the control board 71 through three lead wires 74 to realize the disconnection and connection actions of the contact SW1 and the contact SW3 connected to the power supply U in the control switch 23 of the control system with the corresponding contact SW2 and the contact SW4 respectively. In the actual circuit, the contact SW2 and the contact SW4 can be designed as the same contact to simplify the circuit;

[0066] One end of the wiring harness 73 is connected to an external power source, and the other end is connected to the control board 71 . The control board 71 is electrically connected to the driving unit 61 .

[0067] The travel limit switch may be a contact switch or a non-contact switch such as a reed switch. In this embodiment, a contact switch is preferred.

[0068] like Fig.10 As shown, specifically, a second notch 711 is provided in the middle of the control board 71 , and a second mounting structure 642 matched with the second notch 711 is provided in the insulating sleeve 64 .

[0069] By setting the first mounting structure 641 and the second mounting structure 642 on the insulating sleeve 64 to cooperate with the first notch 611 at the rear end of the drive unit 61 and the second notch 711 of the control board 71 respectively, the installation direction between the drive unit 61 and the control board 71 is unique, which facilitates the wiring of the positive and negative poles of the drive unit 61.

[0070] In addition, three threading holes 712 and two power connection ports 713 are provided near the edge of the control board 71. Three lead wires 74 linearly pass through the corresponding threading holes 712 and converge into the wiring harness 73. The positive and negative poles at the other ends of the wiring harness 73 are electrically connected to the two power connection ports 713 respectively. Connection interfaces 714 for respectively correspondingly electrically connecting the electrodes M1 and M2 of the motor 11 are symmetrically provided on both sides of the insulating sleeve 64 on the control board 71. The rectifier module 24 and the step-down module 25 are integrated on the control board 71. Considering the compact layout and convenient wiring, their positions on the control board 71 can be adjusted.

[0071] like Figure 7 , 8 As shown, the shell assembly 5 includes a first shell 51, a second shell 52 and a connecting sleeve 53 which are coaxially arranged. The connecting sleeve 53 and the second shell 52 are installed at one end of the first shell 51. The outer side surface of the connecting sleeve 53 cooperates with the first shell 51, and the inner side surface cooperates with the second shell 52. Sealing rings are provided on the inner and outer sides of the connecting sleeve 53 so that the connecting sleeve 53 is sealed and connected to the first shell 51 and the second shell 52 respectively.

[0072] like Figure 11-14 As shown, the bearing seat 62 is installed on the inner end surface of the connecting sleeve 53, and the second housing 52 is installed on the outer end surface of the bearing seat 62 by a number of circumferentially uniformly distributed fasteners. The second housing 52 is provided with a first pin hole 521, and the outer end surface of the bearing seat 62 is provided with a second pin hole 621 that matches the first pin hole 521; the mounting plate 63 is provided with a third pin hole 631, and the inner end surface of the bearing seat 62 is provided with a fourth pin hole 622 that matches the third pin hole 631; the mounting plate 63 is also provided with a fifth pin hole 632, and the driving end of the driving unit 61 is provided with a sixth pin hole 612 that matches the fifth pin hole 632; a pin shaft 8 is installed between the first pin hole 521 and the second pin hole 621, the third pin hole 631 and the fourth pin hole 622, and the fifth pin hole 632 and the sixth pin hole 612.

[0073] like Figure 11-13 As shown, the stroke limit unit 72 is installed in the second shell 52 , and the lead wire 74 is arranged at the lower end of the stroke limit unit 72 ; the bearing seat 62 is provided with a wire channel 623 corresponding to the lead wire 74 .

[0074] By setting the first pin hole 521 and the second pin hole 621, the third pin hole 631 and the fourth pin hole 622, and the fifth pin hole 632 and the sixth pin hole 612 corresponding to the positions, and installing the pin shaft 8 to limit it circumferentially, and adding the original fastener connection, the installation directions of the second shell 52, the bearing seat 62, the mounting plate 63 and the drive unit 61 are unified, and the travel limit unit 72 can correspond to the wire channel 623. At the same time, the wire channel 623 is set corresponding to the connection position of the lead wire 74 below and the control board 71, which facilitates the connection of the lead wire 74.

[0075] like Figure 8 , 11 As shown, the second housing 52 further includes an end cover 9, which is mounted on one end of the second housing 52 through circumferentially uniformly distributed fasteners 91 to axially position the first housing 51, and is provided with a through hole 92 for accommodating the wiring harness 73. The fastener 91 cooperates with the lead-out wire mounting through hole 92 to make the mounting direction of the end cover unique.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high current push rod stroke end limit control system, characterized in that: It includes a drive circuit and a control circuit connected to the same power supply, the drive circuit includes a motor, the drive circuit and the control circuit are electrically connected to a first relay and a second relay, the first relay and the second relay each include a pin 3 and a pin 4 for controlling on and off, and a pin 1, a pin 2 and a pin 5 for controlling on and off of a controlled switching circuit; the motor includes an electrode M1 and an electrode M2, the pin 5 of the first relay and the pin 2 of the second relay are connected to the electrode M1 of the motor, the pin 1 of the first relay and the pin 5 of the second relay are connected to the electrode M2 ​​of the motor; the pin 2 of the first relay and the pin 1 of the second relay are respectively connected to two poles of a power supply; The control circuit controls the drive circuit through the first relay and the second relay to drive the motor to run forward, reverse or brake; The control circuit further comprises a first control branch and a control switch which are electrically connected, wherein an input end of the control switch is electrically connected to a power source U, and an output end thereof is electrically connected to an input end of the first control branch to control the on and off of the first control branch; The control switch includes a contact SW1 and a contact SW3 connected to a power source U, and a contact SW2 and a contact SW4 connected to a first control branch; The first control branch includes a first transistor, and a base of the first transistor is electrically connected to the contact SW2 and the contact SW4 of the control switch.

2. A high current push rod stroke end limit control system according to claim 1, characterized in that: The control circuit also includes a second control branch, a rectifier module and a voltage reduction module which are electrically connected; The rectifier module includes an input end connected to a power supply, and an output end connected to the second control branch and the step-down module, and provides a stable current when turned on.

3. A high current push rod stroke end limit control system according to claim 2, characterized in that: The rectifier module includes pins 1 and 2 connected to a power source, a pin 3 for output, and a pin 4 for grounding.

4. A high current push rod stroke end limit control system according to claim 3, characterized in that: The collector of the first transistor is connected to the pin 4 of the first relay and the output end of the buck module, and the emitter is grounded.

5. A high current push rod stroke end limit control system according to claim 4, characterized in that: The second control branch includes a second transistor, the base of the second transistor is electrically connected to the pin 3 of the rectifier module, the collector is connected to the pin 4 of the second relay and the output end of the buck module, and the emitter is grounded.

6. A high current push rod stroke end limit control system according to claim 5, characterized in that: A resistor is connected between the base and emitter of the first transistor and the second transistor, and a capacitor is additionally connected between the base and emitter of the first transistor.

7. A high current push rod stroke end limit control system according to claim 3, characterized in that: Pin 2 of the first relay, contact SW1 of the control switch and pin 2 of the rectifier module are connected to one pole of the power supply, pin 1 of the second relay, contact SW3 of the control switch and pin 1 of the rectifier bridge are connected to the other pole of the power supply, and the two poles of the power supply can be set interchangeably.

8. An electric push rod, characterized in that: It includes a shell component that is unique in the circumferential mating direction, a power component installed in the shell component, and a control component, and is characterized in that it also includes a high-current push rod stroke end limit control system as described in any one of claims 2-7; the control component includes a control board, a stroke limit unit and a wiring harness, the control system is integrated on the control board, the stroke limit unit is electrically connected to the control board through three lead wires, so as to realize the disconnection and connection actions of the contacts SW1 and SW3 connected to the power supply U in the control switch of the control system with the corresponding contacts SW2 and SW4 respectively; one end of the wiring harness is connected to an external power supply, and the other end is connected to the control board, and the control board is electrically connected to the drive unit.

9. The electric linear actuator according to claim 8, characterized in that: The control board is also provided with three wire threading holes and two power connection ports. Three lead wires linearly pass through the corresponding wire threading holes and converge into the wiring harness. The positive and negative poles at the other end of the wiring harness are electrically connected to the two power connection ports respectively. The control board is also provided with connection interfaces for respectively correspondingly electrically connecting the electrodes M1 and M2 of the motor. The rectifier module and the buck module are integrated on the control board.

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