Electric push rod with hand reset function

Abstract

The electric push rod comprises a shell, a driving mechanism, an outer pipe, a push rod assembly and a first limiting switch, the outer pipe is fixedly connected to the outer side of the shell, a guide groove is formed in the inner side wall of the outer pipe in the length direction, and the push rod assembly is arranged in the outer pipe and is in sliding fit with the inner side of the outer pipe; the input end of the push rod assembly extends into and is fixed into the driving mechanism, the first limiting switch is electrically connected with the driving mechanism and is fixed to the push rod assembly, and the top of the first limiting switch is clamped into the guide groove. The first limiting switch moves leftwards in the sliding groove along with the push rod mechanism until the triggering end of the first limiting switch extrudes the inner wall of the left side of the outer pipe and triggers the first limiting switch, the first limiting switch controls the driving mechanism to be closed, the pushing assembly is prevented from excessively retracting in the outer pipe, the outer pipe is protected, and the service life of the electric push rod is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod technical field especially, it relates to electric push rod with hand shake reset. BACKGROUND

[0002] The existing electric push rod includes motor, gear set and push rod mechanism, starts motor, and the output end rotation of motor is driven to screw rod through gear set, and screw rod rotates synchronously, and screw rod rotation generates screw thread displacement with the slider on screw rod, and the slider is fixedly connected with push rod, makes push rod to stretch out or retract in the inside pipe, in the operation process, if not timely closing motor when push rod is retracted completely to the inside pipe, the slider can damage the outside pipe, causes the service life reduction of electric push rod.

[0003] It needs to be explained that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, so it can include the information which does not constitute the prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiency of prior art, the utility model discloses electric push rod with hand shake reset to solve the problem that the service life of electric push rod is reduced when push rod is completely stretched out or retracted to the inside pipe, if not timely closing motor, the slider can damage the outside pipe.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] Electric push rod with hand shake reset includes:

[0007] Shell;

[0008] Driving mechanism, at least part is located in the shell;

[0009] The outside pipe is fixedly connected to the outside of the shell, and the inside wall of the outside pipe is provided with a guide groove along the length direction;

[0010] Push rod assembly, set in the inside pipe and with the inside slide of the outside pipe, the input end of the push rod assembly is inserted and fixed in the driving mechanism;

[0011] The first limit switch is electrically connected with the driving mechanism, and the first limit switch is fixed on the push rod assembly, and the top of the first limit switch is clamped into the guide groove;

[0012] Wherein, the driving mechanism drives the push rod assembly to retract to the first position, the first limit switch slides to the left in the guide groove, until the left end of the first limit switch triggers the end to contact and extrude the left inside wall of the outside pipe and triggers the first limit switch, and the first limit switch controls the closing of the driving mechanism.

[0013] Further, the electric push rod with hand reset further comprises a second limit switch, a top end of the second limit switch is fixedly connected to a groove bottom of a rightmost end in the guide groove, and the second limit switch is electrically connected to the driving mechanism.

[0014] The driving mechanism drives the push rod assembly to extend to a second position, the second limit switch slides to the right in the guide groove until the first limit switch presses a trigger end of the second limit switch and triggers the second limit switch, and the second limit switch controls the driving mechanism to be closed.

[0015] Further, the push rod assembly comprises a lead screw, an inner tube and a lead screw nut, an input end of the lead screw extends into and is clamped in the driving mechanism, the driving mechanism drives the lead screw to rotate, the lead screw nut is threadedly connected to the lead screw, the inner tube is fixedly sleeved outside the lead screw nut, an outside of the lead screw nut is fixedly sleeved with a sliding block, an outside of the sliding block is slidably connected to an inside of the outer tube, and the first limit switch is fixedly connected to a top of the sliding block.

[0016] Further, the driving mechanism comprises a motor and a gear set, the motor is arranged on a right upper end of the shell, the gear set is arranged inside the shell, the outer tube is fixedly connected to a right lower end of the shell, an output end of the motor is connected to an input gear in the gear set, an input end of the push rod assembly is connected to an output gear of the gear set, and the push rod assembly and the motor are driven through the gear set.

[0017] Further, the driving mechanism further comprises a hand crank mechanism, the hand crank mechanism is arranged in the shell and located at a left end of the gear set, the hand crank mechanism comprises a worm, a bevel gear and a hand crank shaft, the worm is sleeved on the output end of the motor and located at the left end of the gear set, the hand crank shaft is rotatably arranged in the shell and horizontally arranged along a front-rear direction of the shell, the bevel gear is fixedly sleeved on a rear end of the hand crank shaft, the bevel gear is engaged with the worm, a friction angle of the worm is greater than a helix angle of the worm, and rotating the bevel gear drives the worm to rotate.

[0018] Further, the hand crank mechanism further comprises a plug and a hand crank handle, a hole is arranged at a front end of the shell, a position of the hole corresponds to the hand crank shaft, and a front end shaft of the hand crank shaft extends out of the hole.

[0019] In a normal working state of the motor, the plug is clamped in the hole, and in a fault state of the motor, the hand crank handle is arranged on the front end shaft of the hand crank shaft.

[0020] Further technical solutions are that the hand-cranking mechanism further comprises a bearing seat fixedly arranged in the shell, and the hand-cranking shaft is fixedly arranged in a bearing of the bearing seat.

[0021] Further technical solutions are that the push rod assembly further comprises a front pull head, and a left end of the front pull head is threadedly connected to a right end of the inner tube.

[0022] The beneficial effects of the embodiments of the utility model are as follows:

[0023] (1) The electric push rod with hand-cranking reset comprises a shell, a driving mechanism, an outer tube, a push rod assembly and a first limit switch. The driving mechanism is started to drive the push rod assembly to retract to a first position. The first limit switch moves leftward in the sliding groove along with the push rod mechanism until the trigger end of the first limit switch presses the left inner wall of the outer tube and triggers the first limit switch. The first limit switch controls the driving mechanism to be closed to prevent the push assembly from excessively retracting in the outer tube, thereby protecting the outer tube and prolonging the service life of the electric push rod.

[0024] (2) Further, the push rod assembly comprises a lead screw, an inner tube and a lead screw nut. The input end of the lead screw is inserted into and clamped in the driving mechanism. The driving mechanism drives the lead screw to rotate. The lead screw nut is threadedly connected to the lead screw. The inner tube is arranged outside the lead screw. The left end of the inner tube is clamped to the outside of the lead screw nut. The outside of the lead screw nut is fixedly sleeved with a sliding block. The outside of the sliding block is slidably connected to the inside of the outer tube. The first limit switch is fixedly connected to the top of the sliding block. The top of the first limit switch is clamped into the guide groove. In the process of rotation of the lead screw, the lead screw nut, the sliding block and the first limit switch do not rotate together with the lead screw. The relative positions between the first limit switch and the lead screw, the lead screw nut and the sliding block are fixed. The first limit switch can accurately and reliably transmit signals when the push rod moves to the position.

[0025] (3) Further, the gear box further comprises a second limit switch. The top end of the second limit switch is fixedly connected to the guide groove. The second limit switch is electrically connected to the driving mechanism. The driving mechanism is started to drive the push rod assembly to extend to a second position. The second limit switch slides rightward in the guide groove until the first limit switch presses the trigger end of the second limit switch and triggers the second limit switch. The second limit switch controls the driving mechanism to be closed. The second limit switch is electrically connected to the driving mechanism. When the push rod assembly completely extends to the outer tube, the second limit switch closes the driving mechanism to prevent the push assembly from excessively extending outside the outer tube, thereby protecting the outer tube and prolonging the service life of the electric push rod. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of a transverse section structure of the electric push rod with hand-cranking reset.

[0027] Figure 2 It isFigure 1 Enlarged view at A.

[0028] Figure 3 The first vertical section structure schematic diagram of the electric push rod with hand shake reset.

[0029] Figure 4 The second vertical section structure schematic diagram of the electric push rod with hand shake reset.

[0030] In the figure:

[0031] 1, shell; 2, drive mechanism; 21, motor; 22, gear set; 221, first gear; 222, second gear; 223, third gear; 224, fourth gear; 23, hand shake mechanism; 231, worm; 232, bevel gear; 233, hand shake shaft; 234, bearing seat; 235, plug; 3, outer tube; 4, push rod assembly; 41, screw rod; 42, inner tube; 43, screw rod nut; 44, sliding block; 45, front pull head; 5, first limit switch; 6, guide groove; 7, second limit switch. DETAILED DESCRIPTION

[0032] The specific embodiments of the utility model will be described below in conjunction with the drawings.

[0033] In order to make the purpose, technical scheme and advantages of the utility model more clear, the device proposed by the utility model is further described in detail below in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be more clear. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate and clearly assist the purpose of explaining the embodiments of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings. It is known that the structure, proportion, size and the like shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification, so that people skilled in the art can understand and read, and are not used to limit the conditions of the implementation of the utility model, so they do not have the technical essence, any modification of structure, change of proportion relationship or adjustment of size, as long as it does not affect the effect and purpose that the utility model can produce, it should still fall within the scope of the technical content disclosed by the utility model.

[0034] Embodiment:

[0035] Figure 1 The horizontal section structure schematic diagram of the electric push rod with hand shake reset. Figure 2 For Figure 1 Enlarged view at A. As Figures 1-2As shown, the electric push rod with hand reset comprises a shell 1, a driving mechanism 2, an outer tube 3, a push rod assembly 4 and a first limit switch 5. The outer tube 3 is fixedly connected to the outer side of the shell 1. A guide groove 6 is formed in the inner side wall of the outer tube 3 along the length direction. The push rod assembly 4 is arranged inside the outer tube 3 and is in sliding fit with the inner side of the outer tube 3. The input end of the push rod assembly 4 extends into and is fixed in the driving mechanism 2. As an example, the push rod assembly 4 comprises a lead screw 41, an inner tube 42 and a lead screw nut 43. The input end of the lead screw 41 extends into and is clamped in the driving mechanism 2. The driving mechanism 2 drives the lead screw 41 to rotate. The lead screw nut 43 is threadedly connected to the lead screw 41. The inner tube 42 is fixedly sleeved on the outer side of the lead screw nut 43. The outer side of the lead screw nut 43 is fixedly sleeved with a sliding block 44. The outer side of the sliding block 44 is in sliding connection with the inner side of the outer tube 3. The first limit switch 5 is fixedly connected to the top of the sliding block 44.

[0036] As shown, Figure 2 The driving mechanism 2 is arranged at least partially in the shell 1. As an example, the driving mechanism 2 comprises a motor 21 and a gear set 22. The motor 21 is arranged on the right upper end of the shell 1. The gear set 22 is arranged inside the shell 1. The outer tube 3 is fixedly connected to the right lower end of the shell 1. The output end of the motor 21 is connected with an input gear in the gear set 22. The input end of the push rod assembly 4 is connected with an output gear in the gear set 22. The push rod assembly 4 and the motor 21 are driven through the gear set 22. Specifically, the gear set 22 comprises a first gear 221, a second gear 222, a third gear 223 and a fourth gear 224. The second gear 222 and the third gear 223 are double gears. The large gear of the second gear 222 is located at the upper end of the small gear thereof. The small gear of the third gear 223 is located at the upper end of the large gear thereof. The first gear 221 is fixedly sleeved on the output end of the motor 21. The large gear of the second gear 222 is in mesh with the first gear 221, and the second gear 222 is located below the first gear 221. The large gear of the third gear 223 is in mesh with the small gear of the second gear 222. The fourth gear 224 is fixedly sleeved on the input end of the push rod assembly 4. The fourth gear 224 is in mesh with the small gear of the third gear 223. The fourth gear 224 drives the push rod assembly 4 to extend out or retract relative to the outer tube 3.

[0037] As shown, Figure 1 The first limit switch 5 is electrically connected with the driving mechanism 2. The first limit switch 5 is fixed on the push rod assembly 4. The top of the first limit switch 5 is clamped into and in sliding connection with the guide groove 6. Specifically, the driving mechanism 2 drives the push rod assembly 4 to retract to the first position. The first limit switch 5 slides leftward in the guide groove 6 until the triggering end of the first limit switch 5 presses the left inner wall of the outer tube 3 and triggers the first limit switch 5. The first limit switch 5 controls the driving mechanism 2 to be closed.

[0038] As shown, Figure 1As shown, further, the electric push rod with hand reset further comprises a second limit switch 7, the top end of the second limit switch 7 is fixedly connected in the guide groove 6, the second limit switch 7 is electrically connected with the driving mechanism 2, wherein the driving mechanism 2 drives the push rod assembly 4 to extend to the second position, the second limit switch 7 slides to the right in the guide groove 6 until the first limit switch 5 presses the trigger end of the second limit switch 7 and triggers the second limit switch 7, and the second limit switch 7 controls the driving mechanism 2 to be closed. By electrically connecting the driving mechanism 2 with the second limit switch 7, when the push rod assembly 4 is fully extended to the outer tube 3, the second limit switch 7 closes the driving mechanism 2, preventing the push assembly from being excessively extended outside the outer tube 3, protecting the outer tube 3 and prolonging the service life of the electric push rod.

[0039] Figure 3 The first vertical section structure schematic view of the electric push rod with hand reset. Figure 4 The second vertical section structure schematic view of the electric push rod with hand reset. Figures 3-4 As shown, further, the gear box further comprises a hand crank mechanism 23, the hand crank mechanism 23 is arranged in the shell 1 and located at the left end of the gear set 22, the hand crank mechanism 23 comprises a worm 231, a helical gear 232 and a hand crank shaft 233, the worm 231 is sleeved on the output end of the motor 21 and located at the left end of the first gear 221, the hand crank shaft 233 is rotatably arranged in the shell 1 and horizontally arranged along the front-back direction of the shell 1. Exemplarily, the hand crank mechanism 23 further comprises a bearing seat 234, the bearing seat 234 is fixedly arranged in the shell 1, and the hand crank shaft 233 is fixedly arranged in the bearing of the bearing seat 234. The helical gear 232 is fixedly sleeved on the rear end of the hand crank shaft 233, the helical gear 232 is engaged with the worm 231, the friction angle of the worm 231 is greater than the helix angle of the worm 231, and rotating the helical gear 232 drives the worm 231 to rotate. When the motor 21 fails or manual adjustment of the push rod is needed, the worm 231 and the gear set 22 are manually driven by rotating the hand crank shaft 233, the manual operation is converted into linear motion of the push rod assembly 4, the push rod assembly 4 is recovered or adjusted, the emergency capability of the electric push rod is enhanced, and the flexibility and reliability are improved. At the same time, the hand crank shaft 233 is horizontally arranged along the front-back direction of the shell 1, and the hand crank shaft 233 is arranged at a 90° direction with the output end of the motor 21, thereby saving the space in the parallel direction of the output end of the motor 21.

[0040] As Figures 3-4As shown, further, the hand crank mechanism 23 further comprises a plug 235 and a hand crank, the front end of the shell 1 is provided with a hole, the position of the hole corresponds to the hand crank shaft 233, the front end of the hand crank shaft 233 extends out of the hole, wherein, in the normal working state of the motor 21, the plug 235 is clamped in the hole, in the fault state of the motor 21, the hand crank is arranged on the front end of the hand crank shaft 233, the plug 235 is arranged in the hole on the shell 1, and the plug 235 plays a role in closing or protecting the front end of the hand crank shaft 233, thereby improving the waterproof performance of the electric push rod and expanding the application range of the electric push rod.

[0041] Further, the push rod assembly 4 further comprises a front pull head 45, and the left end of the front pull head 45 is threadedly connected to the right end of the inner tube 42.

[0042] In the working process of the embodiment:

[0043] The motor 21 is started, the output end of the motor 21 drives the first gear 221 to rotate in the forward direction, the first gear 221 drives the second gear 222, the second gear 222 drives the third gear 223, the third gear 223 drives the fourth gear 224, the fourth gear 224 rotates to drive the lead screw 41 to rotate, the lead screw nut 43 is displaced to the right relative to the lead screw 41, the sliding block 44, the first limit switch 5 and the inner tube 42 move to the right together, when the inner tube 42 is completely extended out of the outer tube 3, the first limit switch 5 presses the trigger end of the second limit switch 7 and triggers the second limit switch 7, the second limit switch 7 sends a signal to the motor 21, and the motor 21 is turned off.

[0044] The motor 21 is started again, the output end of the motor 21 drives the first gear 221 to rotate in the reverse direction, the first gear 221 drives the second gear 222, the second gear 222 drives the third gear 223, the third gear 223 drives the fourth gear 224, the fourth gear 224 rotates to drive the lead screw 41 to rotate, the lead screw nut 43 is displaced to the left relative to the lead screw 41, the sliding block 44, the first limit switch 5 and the inner tube 42 move to the left together, when the inner tube 42 is completely retracted into the outer tube 3, the trigger end of the first limit switch 5 presses the left side inner wall of the outer tube 3 and triggers the first limit switch 5, the first limit switch 5 sends a signal to the motor 21, and the motor 21 is turned off.

[0045] When the inner tube 42 extends out of the outer tube 3, the motor 21 fails, the plug 235 is removed from the shell 1, the hand crank is installed on the front end of the hand crank shaft 233, the hand crank is rotated to drive the hand crank shaft 233 to rotate, the bevel gear 232 at the rear end of the hand crank shaft 233 rotates to drive the worm 231 to rotate, so that the output end of the motor 21 reverses, the gear set 22 drives the lead screw 41 to rotate, the lead screw nut 43 moves to the left relative to the lead screw 41, the inner tube 42 is retracted into the outer tube 3, the hand crank is stopped, and subsequent processing such as disassembly and maintenance is performed.

[0046] In this embodiment, the first limit switch 5 is provided, the driving mechanism 2 is electrically connected through the first limit switch 5, when the push rod assembly 4 is completely retracted into the outer tube 3, the first limit switch 5 closes the driving mechanism 2, preventing the push rod assembly from being excessively retracted in the outer tube 3, protecting the outer tube 3 and prolonging the service life of the electric push rod.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0048] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An electric push rod with hand-cranked reset, characterized in that, include: Shell (1); The drive mechanism (2) is at least partially disposed within the housing (1); The outer tube (3) is fixedly connected to the outside of the shell (1), and a guide groove (6) is provided on the inner side wall of the outer tube (3) along the length direction; A push rod assembly (4) is located inside the outer tube (3) and slides with the inner side of the outer tube (3). The input end of the push rod assembly (4) extends into and is fixed inside the drive mechanism (2). The first limit switch (5) is electrically connected to the drive mechanism (2). The first limit switch (5) is fixed on the push rod assembly (4). The top of the first limit switch (5) is inserted into the guide groove (6). The drive mechanism (2) drives the push rod assembly (4) to retract to the first position, and the first limit switch (5) slides to the left in the guide groove (6) until the trigger end of the first limit switch (5) presses against the inner wall of the left side of the outer tube (3) and triggers the first limit switch (5). The first limit switch (5) controls the drive mechanism (2) to close.

2. The electric push rod with hand-cranked reset according to claim 1, characterized in that: The electric push rod with hand-crank reset also includes a second limit switch (7), the top of which is fixedly connected to the bottom of the rightmost end of the guide groove (6), and the second limit switch (7) is electrically connected to the drive mechanism (2). The drive mechanism (2) drives the push rod assembly (4) to extend to the second position, and the second limit switch (7) slides to the right in the guide groove (6) until the first limit switch (5) squeezes the trigger end of the second limit switch (7) and triggers the second limit switch (7), and the second limit switch (7) controls the drive mechanism (2) to close.

3. The electric push rod with hand-cranked reset according to claim 1, characterized in that: The push rod assembly (4) includes a lead screw (41), an inner tube (42), and a lead screw nut (43). The input end of the lead screw (41) extends into and is engaged with the drive mechanism (2). The drive mechanism (2) drives the lead screw (41) to rotate. The lead screw nut (43) is threaded onto the lead screw (41). The inner tube (42) is fixedly sleeved on the outside of the lead screw nut (43). A slider (44) is fixedly sleeved on the outside of the lead screw nut (43). The outside of the slider (44) is slidably connected to the inside of the outer tube (3). The first limit switch (5) is fixedly connected to the top of the slider (44).

4. The electric push rod with hand-cranked reset according to claim 1, characterized in that: The drive mechanism (2) includes a motor (21) and a gear set (22). The motor (21) is located at the upper right side of the housing (1). The gear set (22) is mounted inside the housing (1). The outer tube (3) is fixedly connected to the lower right side of the housing (1). The output end of the motor (21) is connected to the input gear in the gear set (22). The input end of the push rod assembly (4) is connected to the output gear in the gear set (22). The push rod assembly (4) and the motor (21) are driven by the gear set (22).

5. The electric push rod with hand-cranked reset according to claim 4, characterized in that: The drive mechanism (2) further includes a hand crank mechanism (23), which is located inside the housing (1) and at the left end of the gear set (22). The hand crank mechanism (23) includes a worm gear (231), a helical gear (232), and a hand crank shaft (233). The worm gear (231) is sleeved on the output end of the motor (21) and located at the left end of the gear set (22). The hand crank shaft (233) is rotatably mounted on the... The hand crank shaft (233) is horizontally arranged in the front-rear direction of the housing (1) and the helical gear (232) is fixedly sleeved on the rear end of the hand crank shaft (233). The helical gear (232) meshes with the worm (231). The friction angle of the worm (231) is greater than the helix angle of the worm (231). When the helical gear (232) is rotated, the helical gear (232) drives the worm (231) to rotate.

6. The electric push rod with hand-cranked reset according to claim 5, characterized in that: The hand crank mechanism (23) also includes a plug (235) and a hand crank handle. The front end of the housing (1) is provided with a hole, the position of which corresponds to the hand crank shaft (233). The front end of the hand crank shaft (233) extends into and out of the hole. When the motor (21) is in normal working condition, the plug (235) is engaged in the hole. When the motor (21) is in fault condition, the plug (235) is removed and the hand crank is installed on the front end of the hand crank shaft (233).

7. The electric push rod with hand-cranked reset according to claim 5, characterized in that: The hand crank mechanism (23) also includes a bearing seat (234), which is fixedly disposed inside the housing (1), and the hand crank shaft (233) is fixedly disposed in the bearing of the bearing seat (234).

8. The electric push rod with hand-cranked reset according to claim 3, characterized in that: The push rod assembly (4) also includes a front pull head (45), the left end of which is threaded to the right end of the inner tube (42).

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