Electric push rod with pressure detection function

Abstract

The utility model discloses an electric push rod with a pressure detection function, which comprises a shell, a rotary guide sleeve arranged in the shell, a driving mechanism used for driving the rotary guide sleeve to rotate, a push rod arranged in the rotary guide sleeve and clamped with the rotary guide sleeve, a lead screw arranged in the push rod, and a lead screw nut arranged on the lead screw and in threaded connection with the lead screw, the shell is provided with an upper gland, the upper gland is provided with a pressure detection mechanism which is connected with the lead screw and converts pressure into electric signals, the shell is provided with a guide rail, the guide rail is provided with a circuit board used for closing the driving mechanism, the pressure detection mechanism is electrically connected with the circuit board, and the circuit board is electrically connected with the driving mechanism. By detecting the pressure of the push rod, the driving motor is stopped in time when the pressure of the push rod is overloaded, so that the service life of the motor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to an electric push rod with a pressure detection function. Background Art

[0002] An electric linear actuator is an electric drive device that can convert the rotational motion of an electric motor into linear reciprocating motion. In actual use, when the required thrust / pull force is greater than the thrust / pull force generated by the electric linear actuator, the push rod of the electric linear actuator cannot continue to extend or retract, causing the motor to stall. Frequent stalling of the motor during use will greatly reduce the life of the motor. When using an electric linear actuator, the amount of force required in different situations is different. The existing electric linear actuator cannot adjust the amount of force generated by the push rod after leaving the factory, and the thrust / pull force value cannot be set according to actual use. Utility Model Content

[0003] The purpose of the utility model is to solve the above technical problems and provide an electric push rod with a pressure detection function. The utility model detects the push rod pressure and stops driving the motor in time when the push rod pressure is overloaded, thereby ensuring the service life of the motor.

[0004] The utility model adopts the following technical solution to solve the above technical problems: an electric push rod with pressure detection function, including a housing, a rotating guide sleeve arranged in the housing, a driving mechanism for driving the rotating guide sleeve to rotate, a push rod arranged in the rotating guide sleeve and engaged with the rotating guide sleeve, a lead screw arranged in the push rod, a lead screw nut connected with the lead screw thread is arranged on the lead screw, the lead screw nut is engaged with the push rod, an upper pressure cover is arranged on the housing, a pressure detection mechanism connected with the lead screw and converting pressure into an electrical signal is arranged on the upper pressure cover, a guide rail is arranged on the housing, a circuit board for closing the driving mechanism is arranged on the guide rail, the pressure detection mechanism is electrically connected with the circuit board, and the circuit board is electrically connected with the driving mechanism. The driving mechanism drives the rotating guide sleeve to rotate, the rotating guide sleeve rotates and drives the push rod engaged with the rotating guide sleeve to rotate, the push rod rotates and drives the lead screw nut to rotate, the lead screw nut rotates and drives the lead screw to move, the lead screw moves and drives the push rod to move while rotating in the rotating guide sleeve, at this time, the pressure detection mechanism moves with the lead screw, the pressure detection mechanism converts the pressure into an electrical signal and sends it to the circuit board, and the circuit board determines whether to close the driving mechanism according to the received electrical signal.

[0005] Preferably, the pressure detection mechanism includes a pressure detection elastic body provided on the upper cover and connected to the lead screw, and a strain gauge provided on the pressure detection elastic body, and the strain gauge is electrically connected to the circuit board. A space for up and down movement is left between the lead screw and the plane of the upper cover. When the push rod moves downward, the lead screw will have an upward reaction force acting on the pressure detection elastic body; when the push rod moves upward, the lead screw will have a downward reaction force acting on the pressure detection elastic body. When the pressure detection elastic body is deformed, this deformation causes the strain gauge provided on the pressure detection elastic body to be deformed accordingly, thereby changing its resistance value. After the resistance value changes, it is converted into a voltage or current signal and sent to the circuit board.

[0006] Preferably, a pressure regulating knob is provided on the outer side of the housing, and the pressure regulating knob is connected to the circuit board. The resistance value on the circuit is adjusted by setting the pressure regulating knob, so that the pressure on the strain gauge can be adjusted, thereby setting the pressure on the push rod to close the driving mechanism.

[0007] Preferably, a Hall control switch for sending a control signal to the circuit board is provided on the circuit board, a magnet embedding hole is provided on the push rod, a magnet is provided in the magnet embedding hole, and the magnet and the Hall control switch form induction.

[0008] Preferably, the Hall control switch includes an upper Hall control switch and a lower Hall control switch, which are respectively arranged at two ends of the circuit board, and are both connected to the circuit board. When the push rod moves upward, the upper Hall control switch works, and when the magnet embedded in the push rod rotates upward and sweeps across the upper Hall control switch, the circuit board disconnects the power supply, the drive motor stops working, and the push rod is locked at the upper dead point; when the push rod moves downward, the lower Hall control switch works, and when the magnet embedded in the push rod rotates downward and sweeps across the lower Hall control switch, the circuit board disconnects the power supply, the drive motor stops working, and the push rod is locked at the lower dead point; the upper and lower dead points of the electric push rod are controlled by the Hall control switch. When the push rod moves downward, if the pressure detection elastic body is deformed and the detected thrust is greater than the thrust set by the electric push rod, the motor stops working and the push rod no longer descends; if the pressure detection elastic body has not detected that the deformation generated by the thrust is greater than or equal to the thrust set by the pressure adjustment knob on the electric push rod, the electric push rod continues to descend until the magnet sweeps across the effective area of ​​the Hall control switch, and the drive motor stops working, and the push rod is locked at the down point; when the push rod moves upward, if the pressure detection elastic body is deformed and the detected pulling force is greater than the thrust set by the pressure adjustment knob on the electric push rod, the motor stops working, and the push rod no longer rises or falls; if the pressure detection elastic body has not detected that the deformation pulling force is greater than or equal to the pulling force set by the electric push rod, the electric push rod continues to rise until the magnet sweeps across the effective area of ​​the Hall control switch, and the drive motor stops working, and the push rod is locked at the up point. The electric push rod realizes upper and lower locking and overload locking through the control of the upper and lower dead point Hall control switches and the pressure detection elastic body, which greatly protects the driving motor of the electric push rod and realizes adjustable push / pull force, which can be used in different usage situations.

[0009] Preferably, the driving mechanism includes a driving motor and a reduction gear box, the reduction gear box is provided with a first gear driven by the driving motor for rotation, a second gear is provided at one end of the rotating guide sleeve, the first gear is meshed with the second gear, and the driving motor is connected to the circuit board.

[0010] Preferably, a slideway is provided on the rotating guide sleeve, and a first lug is provided on the push rod, and the first lug is clamped in the slideway and moves along the slideway. Through the arrangement of the slideway and the first lug, when the rotating guide sleeve rotates, the slideway drives the first lug to rotate, thereby rotating the push rod, and when the push rod moves, the first lug is clamped in the slideway and moves along the slideway.

[0011] Preferably, an upper cover is provided at the upper end of the push rod, a flat shaft is provided at the upper end of the screw rod, a flat shaft hole is provided in the upper cover, and the flat shaft is inserted into the flat shaft hole. Through the design of the flat shaft and the flat shaft hole, the screw rod is rotated to limit the position, so that the screw rod only moves.

[0012] Preferably, a plane bearing is provided in the upper pressure cover, a plane bearing hole is provided on the plane bearing, and the screw rod passes through the plane bearing hole and is connected to the pressure detection elastomer.

[0013] Preferably, the plane bearing comprises a first axial surface and a second axial surface, a shaft ball and a shaft plate are arranged between the first axial surface and the second axial surface, a shaft plate hole is arranged on the shaft plate, a screw rod passes through the shaft plate hole, and a shaft ball is arranged on the outside of the shaft plate. When the screw rod moves downward, the screw rod drives the shaft plate downward, and the shaft plate moves downward to drive the plane bearing downward to push the push rod downward, and when the screw rod moves upward, the screw rod drives the shaft plate upward, and the shaft plate moves upward to drive the plane bearing upward to move the push rod upward.

[0014] Preferably, the screw nut is provided with a second lug, the push rod is provided with a groove, and the second lug is clamped in the groove.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model detects the push rod pressure and stops driving the motor in time when the push rod pressure is overloaded, thereby ensuring the service life of the motor;

[0017] 2. The push rod of the utility model can realize rotation and linear motion at the same time, making the product structure more compact and the installation method more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the utility model without the shell.

[0020] Figure 3 It is a structural schematic diagram of a rotating guide sleeve.

[0021] Figure 4 yes Figure 3 Partial enlarged image.

[0022] Figure 5 It is a structural schematic diagram of a rotating guide sleeve and a push rod.

[0023] Figure 6 It is a schematic diagram of the structure of the push rod.

[0024] Figure 7 yes Figure 6 Partial enlargement.

[0025] Figure 8 It is a structural diagram of the screw rod.

[0026] Fig. 9 yes Figure 8 Partial enlargement.

[0027] Fig.10 It is a structural diagram of a lead screw and a lead screw nut.

[0028] Fig.11 It is a structural diagram of the screw nut.

[0029] Fig.12 It is a structural diagram of a plane bearing.

[0030] Fig.13 It is a structural schematic diagram of the upper gland.

[0031] Fig.14 It is a structural diagram of a pressure detection mechanism.

[0032] In the figure: 1, rotating guide sleeve, 11, slideway, 12, second gear, 2, push rod, 21, first lug, 22, magnet embedding hole, 23, groove, 3, screw, 31, flat shaft, 4, screw nut, 41, second lug, 5, drive motor, 6, reduction box, 61, first gear, 7, housing, 71, guide rail, 72, circuit board, 731, upper Hall control switch, 732, lower Hall control switch, 8, upper pressure cover, 81, flat shaft hole, 9, plane bearing, 91, first shaft surface, 92, second shaft surface, 93, shaft ball, 94, shaft plate, 941, shaft plate hole, 95, plane bearing hole, 10, pressure detection mechanism, 101, pressure detection elastomer, 102, strain gauge, 103, pressure adjustment knob. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0034] like Figure 1-14 As shown, the utility model is an electric push rod with a pressure detection function, comprising a shell 7, a rotating guide sleeve 1 arranged in the shell 7, a driving mechanism for driving the rotating guide sleeve 1 to rotate, a push rod 2 arranged in the rotating guide sleeve 1 and clamped with the rotating guide sleeve 1, a lead screw 3 arranged in the push rod 2, a lead screw nut 4 threadedly connected to the lead screw 3 is provided on the lead screw 3, the lead screw nut 4 is clamped with the push rod 2, an upper pressure cover 8 is provided on the shell 7, a pressure detection mechanism 10 connected to the lead screw and converting pressure into an electrical signal is provided on the upper pressure cover 8, a guide rail 71 is provided on the shell 7, a circuit board 72 for closing the driving mechanism is provided on the guide rail 71, the pressure detection mechanism 10 is electrically connected to the circuit board 72, and the circuit board 72 is electrically connected to the driving mechanism.

[0035] The pressure detection mechanism 10 includes a pressure detection elastic body 101 provided on the upper pressure cover 8 and connected to the lead screw, and a strain gauge 102 provided on the pressure detection elastic body 101, and the strain gauge 102 is electrically connected to the circuit board 72. In this embodiment, the resistance value of the strain gauge 102 changes after deformation, and the resistance value change caused by the deformation of the strain gauge 102 is converted into a voltage or current signal through the measuring circuit, and the measuring circuit sends the voltage or current signal to the circuit board. Converting the resistance change into a voltage or current change signal belongs to conventional technical means of those skilled in the art.

[0036] A pressure regulating knob 103 is disposed on the outer side of the housing 7 , and the pressure regulating knob 103 is connected to the circuit board 72 .

[0037] A Hall control switch for sending a control signal to the circuit board 72 is provided on the circuit board 72 , and a magnet embedding hole 22 is provided on the push rod 2 . A magnet is provided in the magnet embedding hole 22 , and the magnet and the Hall control switch form induction.

[0038] The Hall control switch includes an upper Hall control switch 731 and a lower Hall control switch 732 . The upper Hall control switch 731 and the lower Hall control switch 732 are respectively arranged at two ends of the circuit board 72 , and both the upper Hall control switch 731 and the lower Hall control switch 732 are connected to the circuit board 72 .

[0039] The driving mechanism includes a driving motor 5 and a reduction box 6. The reduction box 6 is provided with a first gear 61 driven to rotate by the driving motor 5. A second gear 12 is provided at one end of the rotating guide sleeve 1. The first gear 61 is meshed with the second gear 12. The driving motor 5 is connected to the circuit board 72.

[0040] A slideway 11 is provided on the rotating guide sleeve 1, and a first lug 21 is provided on the push rod 2. The first lug 21 is clamped in the slideway 11 and moves along the slideway 11; a second lug 41 is provided on the screw nut 4, and a groove 23 is provided on the push rod 2. The second lug 41 is clamped in the groove 23.

[0041] A flat shaft 31 is disposed at the upper end of the screw rod 3 , a flat shaft hole 81 is disposed in the upper pressure cover 8 , and the flat shaft 31 is inserted into the flat shaft hole 81 .

[0042] A plane bearing 9 is provided inside the upper pressure cover 8 , and a plane bearing hole 95 is provided on the plane bearing 9 . The screw rod 3 passes through the plane bearing hole 95 and is connected to the pressure detection elastic body 101 .

[0043] The plane bearing 9 includes a first axial surface 91 and a second axial surface 92 , between which a shaft ball 93 and a shaft plate 94 are arranged. The shaft plate 94 is provided with a shaft plate hole 941 , through which the screw rod 3 passes, and the shaft ball 93 is arranged on the outer side of the shaft plate 94 .

[0044] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] It should be noted that when an element is referred to as being "fixed on" or "provided on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0046] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

Claims

1. An electric push rod with pressure detection function, characterized in that: The invention comprises a housing (7), a rotating guide sleeve (1) arranged in the housing (7), a driving mechanism for driving the rotating guide sleeve (1) to rotate, a push rod (2) arranged in the rotating guide sleeve (1) and clamped with the rotating guide sleeve (1), a lead screw (3) arranged in the push rod (2), a lead screw nut (4) threadedly connected to the lead screw (3) being provided on the lead screw (3), the lead screw nut (4) being clamped with the push rod (2), an upper pressure cover (8) being provided on the housing (7), a pressure detection mechanism (10) being connected to the lead screw and converting pressure into an electrical signal being provided on the upper pressure cover (8), a guide rail (71) being provided on the guide rail (71), a circuit board (72) for closing the driving mechanism being provided on the guide rail (71), the pressure detection mechanism (10) being electrically connected to the circuit board (72), and the circuit board (72) being electrically connected to the driving mechanism.

2. The electric push rod with pressure detection function according to claim 1, characterized in that: The pressure detection mechanism (10) comprises a pressure detection elastic body (101) provided on the upper pressure cover (8) and connected to the lead screw, and a strain gauge (102) provided on the pressure detection elastic body (101); the strain gauge (102) is electrically connected to the circuit board (72).

3. The electric push rod with pressure detection function according to claim 1 or 2, characterized in that: A pressure regulating knob (103) is provided on the outside of the housing (7), and the pressure regulating knob (103) is connected to the circuit board (72).

4. The electric push rod with pressure detection function according to claim 3, characterized in that: The circuit board (72) is provided with a Hall control switch for sending a control signal to the circuit board (72), the push rod (2) is provided with a magnet embedding hole (22), a magnet is disposed in the magnet embedding hole (22), and the magnet and the Hall control switch form an induction.

5. The electric push rod with pressure detection function according to claim 4, characterized in that: The Hall control switch comprises an upper Hall control switch (731) and a lower Hall control switch (732). The upper Hall control switch (731) and the lower Hall control switch (732) are respectively arranged at two ends of the circuit board (72). The upper Hall control switch (731) and the lower Hall control switch (732) are both connected to the circuit board (72).

6. The electric push rod with pressure detection function according to claim 1, 2, 4 or 5, characterized in that: The driving mechanism comprises a driving motor (5) and a reduction box (6); a first gear (61) driven to rotate by the driving motor (5) is arranged in the reduction box (6); a second gear (12) is arranged at one end of the rotating guide sleeve (1); the first gear (61) is meshed with the second gear (12); and the driving motor (5) is connected to a circuit board (72).

7. The electric push rod with pressure detection function according to claim 6, characterized in that: A slideway (11) is provided on the rotating guide sleeve (1), a first lug (21) is provided on the push rod (2), the first lug (21) is clamped in the slideway (11) and moves along the slideway (11); a second lug (41) is provided on the screw nut (4), a groove (23) is provided on the push rod (2), and the second lug (41) is clamped in the groove (23).

8. The electric push rod with pressure detection function according to claim 1, 2, 4, 5 or 7, characterized in that: A flat shaft (31) is arranged at the upper end of the screw rod (3), a flat shaft hole (81) is arranged in the upper pressure cover (8), and the flat shaft (31) is inserted into the flat shaft hole (81).

9. The electric push rod with pressure detection function according to claim 2, 4, 5 or 7, characterized in that: A plane bearing (9) is arranged inside the upper pressure cover (8), a plane bearing hole (95) is arranged on the plane bearing (9), and the screw rod (3) passes through the plane bearing hole (95) and is connected to the pressure detection elastic body (101).

10. The electric push rod with pressure detection function according to claim 9, characterized in that: The plane bearing (9) comprises a first axial surface (91) and a second axial surface (92), a shaft ball (93) and a shaft plate (94) are arranged between the first axial surface (91) and the second axial surface (92), a shaft plate hole (941) is arranged on the shaft plate (94), the screw rod (3) passes through the shaft plate hole (941), and the shaft ball (93) is arranged on the outer side of the shaft plate (94).

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