Electric push rod

Abstract

The utility model relates to the technical field of electric push rods, in particular to an electric push rod. Comprising a shell and an action execution element arranged in the shell, a driving assembly is arranged at the rear end of the shell, and the driving assembly is in transmission connection with the action execution element; a base plate is arranged in the shell and arranged in the movement direction of the action execution element, a first travel switch is arranged at the front end of the base plate, and a second travel switch is arranged at the rear end of the base plate; the action execution element can respectively trigger the first travel switch and the second travel switch, and the first travel switch and the second travel switch are respectively connected with the driving assembly through wires; the range hood is reasonable in structure, the driving assembly can drive the action executing element to stretch and retract back and forth along the shell, the driving assembly switches the movement direction when the action executing element triggers the first travel switch and the second travel switch, and the distance between the first travel switch and the second travel switch can be customized, so that the opening and closing angle of a range hood air door is matched; and the structural layout is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod technical field, specifically point to a kind of electric push rod. BACKGROUND

[0002] The range of the electric push rod is mainly realized overload protection and forward and reverse control through frequency conversion circuit, that is, when the electric push rod reaches the end of profile, the frequency conversion circuit is overloaded and disconnected to switch to reverse circuit, and at this time, the electric push rod is powered to return to the starting point. Since the range of the electric push rod is related to its specifications, and the damper of the range hood is limited by the installation space, the opening and closing range of the damper does not match the range of the existing electric push rod, so it is necessary to customize the electric push rod to meet the internal structure layout of the range hood, which affects the design and cost of the product. Therefore, the prior art still needs to be improved and developed. SUMMARY

[0003] The utility model discloses to the defects and insufficient of prior art, provide a kind of electric push rod with reasonable structure, customizable range, flexible control.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model discloses a kind of electric push rod, including shell and action execution element being located in shell, the rear end of the shell is equipped with driving assembly, driving assembly is transmission connection with action execution element;Base plate is equipped in the shell, base plate is arranged along the movement direction of action execution element, the front end of the base plate is equipped with first stroke switch, the rear end of base plate is equipped with second stroke switch;Action execution element can respectively trigger first stroke switch and second stroke switch, and first stroke switch and second stroke switch are respectively connected driving assembly by wire.

[0006] According to the above scheme, the action execution element includes electric push rod and screw rod, the front end of the shell is equipped with envelope, and electric push rod is slidably arranged in envelope;The rear end of the shell is equipped with bearing, screw rod is rotationally connected with the shell by bearing, and screw rod is transmission connection with driving assembly;Sleeve is equipped on the screw rod, and sleeve is fixedly connected with electric push rod.

[0007] According to the above scheme, the screw sleeve is provided with a trigger piece, and the trigger piece can trigger the first stroke switch and the second stroke switch respectively when the screw sleeve moves forward and backward along the screw rod.

[0008] According to the above scheme, the screw sleeve is provided with a guide block, and the inner wall of the shell is provided with a sliding groove, and the guide block is slidably arranged in the sliding groove.

[0009] According to the above scheme, the driving assembly comprises a motor, a gearbox and a cover, the cover is arranged on the rear end of the shell, the gearbox is arranged on the cover, and the gearbox is fixedly connected with the shell through bolts; the gearbox is provided with a worm wheel and a worm, a bearing is arranged in the gearbox, and the rear end of the screw rod passes through the cover and the bearing and is connected with the worm wheel; the motor is fixedly connected with the gearbox, the output shaft of the motor passes through the gearbox and is connected with the worm, and the worm is meshed and connected with the worm wheel.

[0010] According to the above scheme, the worm wheel and the screw rod are provided with a positioning pin, the front side of the bearing is provided with a limit snap spring, the rear end of the screw rod is provided with a self-locking nut, and the self-locking nut is arranged on the worm wheel to make the worm wheel cooperate with the limit snap spring to clamp the inner ring of the bearing; the inner wall of the gearbox is provided with a limiting step, and the limiting step and the cover are matched to clamp the outer ring of the bearing.

[0011] According to the above scheme, the motor is provided with a control circuit and a power line, and the first stroke switch and the second stroke switch are connected with the control circuit of the motor through wires.

[0012] According to the above scheme, the front end of the electric push rod is provided with a screw port, and an adapter and a sealing element are arranged on the screw port.

[0013] The utility model has the advantages that: the utility model has reasonable structure, the driving assembly can drive the action execution element to stretch out and draw back along the shell, the driving assembly switches the motion direction when the action execution element triggers the first stroke switch and the second stroke switch, the distance between the first stroke switch and the second stroke switch can be customized, thereby completely matching the opening and closing angle of the range hood damper, optimizing the internal structure layout of the range hood, and improving the competitiveness of the product. ACCURATE DRAWINGS

[0014] Figure 1 It is the overall structure schematic diagram of the utility model;

[0015] Figure 2 It is the internal structure schematic diagram of the shell and the gearbox of the utility model;

[0016] Figure 3 It is the overall cross section structure schematic diagram of the utility model;

[0017] Figure 4 It is Figure 3 The enlarged structure schematic diagram of A part in the middle.

[0018] Fig.:

[0019] 1, shell; 2, electric push rod; 3, motor; 4, adapter; 11, base plate; 12, first travel switch; 13, second travel switch; 14, envelope; 15, sliding slot; 21, screw; 22, bearing; 23, screw sleeve; 24, trigger; 25, guide block; 26, limit spring; 27, self-locking nut; 28, screw port; 31, gearbox; 32, cover; 33, bolt; 34, worm; 35, worm; 36, positioning pin; 37, limiting step; 38, power cord. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model is described below with reference to the drawings and embodiments.

[0021] As Figures 1-4 shown, the utility model discloses an electric push rod, including shell 1 and the action execution element in shell 1, the rear end of shell 1 is equipped with drive assembly, and drive assembly is transmission connection with action execution element, be equipped with base plate 11 in shell 1, and base plate 11 is along the movement direction of action execution element setting, the front end of base plate 11 is equipped with first travel switch 12, and the rear end of base plate 11 is equipped with second travel switch 13, action execution element can respectively trigger first travel switch 12 and second travel switch 13, and first travel switch 12 and second travel switch 13 are connected drive assembly through wire respectively. Action execution element sets up in shell 1, and action execution element can be telescopic and is equipped in the front end of shell 1, and the both ends of base plate 11 are respectively equipped with first travel switch 12 and second travel switch 13, can understand, and the setting direction of base plate 11 is parallel with the movement direction of action execution element, so that action execution element can trigger first travel switch 12 and second travel switch 13. Specifically, action execution element can trigger first travel switch 12 when moving forward along shell 1, and the control circuit of first travel switch 12 is connected drive assembly and makes it reverse. Conversely, action execution element can trigger second travel switch 13 when moving backward along shell 1, and the control circuit of second travel switch 13 is connected drive assembly and makes it reverse again.

[0022] The travel of the action execution element is limited by the first travel switch 12 and the second travel switch 13, which can adjust the relative installation distance along the base plate 11 to adapt to different opening and closing angles of the range hood damper, thereby simplifying the internal structure of the range hood and improving the market competitiveness of the product.

[0023] The action execution element includes an electric push rod 2 and a screw 21. The front end of the housing 1 is provided with a sleeve 14, and the electric push rod 2 is slidably inserted into the sleeve 14; the rear end of the housing 1 is provided with a bearing 22, and the screw 21 is rotatably connected to the housing 1 through the bearing 22, and the screw 21 is transmission-connected to the drive assembly; the screw 21 is provided with a screw sleeve 23, and the screw sleeve 23 is fixedly connected to the electric push rod 2. The screw 21 is rotationally connected to the housing 1 through the bearing 22. When the drive assembly drives the screw 21 to rotate, the screw sleeve 23 and the electric push rod 2 are driven back and forth through the threaded transmission, so that the electric push rod 2 is extended and retracted back and forth along the sleeve 14 at the front end of the housing 1.

[0024] Furthermore, a trigger 24 is provided on the screw sleeve 23. When the screw sleeve 23 moves forward and backward along the screw rod 21, the trigger 24 can respectively trigger the first travel switch 12 and the second travel switch 13. The motion trajectory of the electric push rod 2 is synchronized with the trigger 24 on the screw sleeve 23. When the trigger 24 triggers the first travel switch 12 or the second travel switch 13, the drive assembly switches the output direction, thereby realizing the telescopic movement of the electric push rod 2.

[0025] The screw sleeve 23 is provided with a guide block 25, and the inner wall of the housing 1 is provided with a slide groove 15, and the guide block 25 is slidably inserted into the slide groove 15. The screw 21 is rotatably connected to the housing 1 through a bearing 22, and the guide block 25 is slidably connected to the slide groove 15 to prevent the screw sleeve 23 from rotating on the screw 21, thereby allowing the screw 21 to drive the screw sleeve 23 and the electric push rod 2 to perform linear motion through thread transmission.

[0026] The drive assembly includes a motor 3, a gearbox 31, and a cover 32. The cover 32 is mounted on the rear end of the housing 1. The gearbox 31 is mounted on the cover 32 and fixedly connected to the housing 1 via bolts 33. A worm gear 34 and a worm 35 are located within the gearbox 31. Bearings 22 are located within the gearbox 31. The rear end of the screw 21 passes through the cover 32 and the bearings 22 and then connects to the worm gear 34. The motor 3 is fixedly connected to the gearbox 31. The output shaft of the motor 3 passes through the gearbox 31 and connects to the worm 35, which meshes with the worm gear 34. The gearbox 31 and cover 32 form a housing assembly to accommodate the bearings 22, worm gear 34, and worm 35. The motor 3 is fixedly mounted on the gearbox 31, with its output shaft connected to the worm 35. The worm 35 meshes with the worm gear 34 to drive the screw 21 to rotate. The cover 32 separates the rear end of the housing 1 from the gearbox 31, allowing lubrication of the gearbox 31 to ensure smooth transmission of the drive assembly.

[0027] Furthermore, a locating pin 36 is provided between the worm gear 34 and the screw 21. A retaining spring 26 is provided on the front side of the bearing 22. A self-locking nut 27 is provided at the rear end of the screw 21. The self-locking nut 27 is mounted on the worm gear 34 so that it cooperates with the retaining spring 26 to clamp the inner race of the bearing 22. A retaining step 37 is provided on the inner wall of the gearbox 31. The retaining step 37 and the cover 32 cooperate to clamp the outer race of the bearing 22. The worm gear 34 drives the screw 21 to rotate via the locating pin 36. The self-locking nut 27 cooperates with the retaining spring 26 to lock the worm gear 34 to the inner race of the bearing 22. Furthermore, the gearbox 31 is fixedly connected to the housing 1 via bolts 33. The cover 32 is also fixed to the port of the housing 1. The gearbox 31 simultaneously clamps the outer race of the bearing 22 via the retaining step 37, thereby preventing the screw 21 from moving.

[0028] The motor 3 is provided with a control circuit and a power line 38. The first limit switch 12 and the second limit switch 13 are connected to the control circuit of the motor 3 via wires. The control circuit can be integrated into the controller of the motor 3. The jump signals generated by the first limit switch 12 and the second limit switch 13 cause the control circuit to switch the output direction of the motor 3, thereby controlling the extension and retraction direction of the electric push rod.

[0029] The front end of the electric push rod 2 is provided with a screw hole 28, on which an adapter 4 and a sealing element are mounted. The adapter 4 is mounted on a screw hole 38 at the front end of the electric push rod 2. The adapter 4 can fine-tune the stroke position through the screw hole, thereby adjusting the opening and closing starting point of the range hood damper, so that the damper ensures the sealing of the air duct.

[0030] It can be understood that the sealing elements mainly include sealing rings, sealing gaskets and sealants, etc. The sealing elements fit the electric push rod 2 and are fixed to the connecting sleeve 14, so that external oil, gas, water and dust impurities will not enter the inner cavity of the shell 1. Of course, sealing elements are also provided on the connecting parts at the front and rear ends of the shell 1 to ensure the sealing of the inner cavity of the shell 1 and improve the stability and service life of the electric push rod.

[0031] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. An electric push rod, comprising a housing (1) and an action executing element arranged in the housing (1), wherein a driving assembly is provided at the rear end of the housing (1), and the driving assembly is in transmission connection with the action executing element; characterized in that: A base plate (11) is provided in the housing (1), and the base plate (11) is arranged along the movement direction of the action execution element. A first travel switch (12) is provided at the front end of the base plate (11), and a second travel switch (13) is provided at the rear end of the base plate (11); the action execution element can trigger the first travel switch (12) and the second travel switch (13) respectively, and the first travel switch (12) and the second travel switch (13) are respectively connected to the driving assembly through wires; The drive assembly comprises a motor (3), a gearbox (31) and a box cover (32); the box cover (32) is arranged on the rear port of the housing (1); the gearbox (31) is arranged on the box cover (32), and the gearbox (31) is fixedly connected to the housing (1) via bolts (33); a worm wheel (34) and a worm (35) are provided in the gearbox (31); a bearing (22) is provided in the gearbox (31); a rear end of the screw (21) passes through the box cover (32) and the bearing (22) and is connected to the worm wheel (34); the motor (3) is fixedly connected to the gearbox (31); an output shaft of the motor (3) passes through the gearbox (31) and is connected to the worm (35); the worm (35) is meshedly connected to the worm wheel (34).

2. The electric linear actuator according to claim 1, wherein: The action execution element comprises an electric push rod (2) and a screw rod (21); a sleeve (14) is provided at the front end of the housing (1), and the electric push rod (2) is slidably inserted into the sleeve (14); a bearing (22) is provided at the rear end of the housing (1); the screw rod (21) is rotationally connected to the housing (1) via the bearing (22), and the screw rod (21) is transmission-connected to the drive assembly; a screw sleeve (23) is provided on the screw rod (21), and the screw sleeve (23) is fixedly connected to the electric push rod (2).

3. The electric linear actuator according to claim 2, wherein: The screw sleeve (23) is provided with a triggering member (24). When the screw sleeve (23) moves forward and backward along the screw rod (21), the triggering member (24) can respectively trigger the first travel switch (12) and the second travel switch (13).

4. The electric linear actuator according to claim 2, wherein: The screw sleeve (23) is provided with a guide block (25), the inner wall of the housing (1) is provided with a slide groove (15), and the guide block (25) is slidably inserted into the slide groove (15).

5. The electric linear actuator according to claim 1, wherein: A positioning pin (36) is provided between the worm wheel (34) and the screw rod (21), a limiting retaining spring (26) is provided on the front side of the bearing (22), and a self-locking nut (27) is provided at the rear end of the screw rod (21). The self-locking nut (27) is mounted on the top of the worm wheel (34) so ​​that it cooperates with the limiting retaining spring (26) to clamp the inner ring of the bearing (22); a limiting step (37) is provided on the inner wall of the gearbox (31), and the limiting step (37) and the box cover (32) are matched to clamp the outer ring of the bearing (22).

6. The electric linear actuator according to claim 1, wherein: The motor (3) is provided with a control circuit and a power line (38), and the first travel switch (12) and the second travel switch (13) are respectively connected to the control circuit of the motor (3) through wires.

7. The electric linear actuator according to claim 2, wherein: The front end of the electric push rod (2) is provided with a screw hole (28), and an adapter (4) and a sealing element are installed on the screw hole (28).

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