Pneumatic power-assisted electric cylinder

Abstract

The utility model belongs to the field of electric cylinders, particularly relates to an air pressure power-assisted electric cylinder, and aims to solve the problem that a screw rod is easy to damage under long-time high-temperature operation caused by inconvenience in heat dissipation of the interior of a cylinder body in the use process of an existing electric cylinder. A mounting seat is fixedly mounted on one side of the cylinder body, a first mounting groove is formed in the mounting seat, a piston is slidably mounted in the cylinder body, a push rod is slidably mounted on the cylinder body, one end of the push rod is fixedly connected with the piston, a ball nut is fixedly mounted on the piston, a second mounting groove is formed in the cylinder body, and a heat dissipation box is fixedly mounted at the bottom of the cylinder body. According to the utility model, in the use process, heat dissipation can be conveniently carried out on the interior of the cylinder body, so that the lead screw can be prevented from being damaged under long-time high-temperature operation, the service life of the lead screw is ensured, and the heat dissipation cylinder is simple in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders, in particular to an electric cylinder with pneumatic assistance. Background Art

[0002] Electric cylinders are products designed for continuous motion, low to high loads (usually high speeds), and can be used multiple times in their service life. These products have extremely high positioning accuracy and controllability, and can achieve precise motion control under loads ranging from several kilograms to 50 tons. The output capacity of ordinary electric cylinders is usually limited by the power of the motor. If used under heavy load conditions, a high-power drive motor must be selected to ensure that the output force and moving speed of the load meet the requirements, but this will result in a larger structural size of the electric cylinder. Therefore, in some specific working conditions, it is necessary to use a power-assisted electric cylinder.

[0003] The patent document with announcement number CN112242777B discloses an internal air pressure differential power-assisted electric cylinder, which includes: a sealed servo motor, a sealed connection device, a screw, a cylinder barrel, a piston rod, a guide device, a piston with a hole, a nut and high-pressure gas. The upper chamber and the lower chamber of the cylinder barrel are filled with high-pressure gas and are connected through a connecting pipe, and work together with the piston with a hole and the hollow piston rod, so that during the operation of the electric cylinder, there is a pressure difference between the upper chamber and the lower chamber of the cylinder barrel, realizing the function of air pressure differential power assistance, thereby improving the output capacity of the electric cylinder. The present invention has a compact structure, and can realize the power-assisting function of the electric cylinder without installing an external power source, which simplifies the drive of the power-assisting electric cylinder, making the power-assisting electric cylinder suitable for working conditions with large output force and limited space.

[0004] However, the above patent document is not convenient for dissipating heat inside the cylinder during use, which makes the screw rod easy to be damaged under long-term high-temperature operation. For this reason, we propose a pneumatically assisted electric cylinder to solve the above problem. Utility Model Content

[0005] The utility model aims to solve the problem in the prior art that the electric cylinder is not easy to dissipate heat inside the cylinder body during use, which leads to the defect that the screw rod is easily damaged under long-term high-temperature operation, and proposes a pneumatically assisted electric cylinder.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A pneumatically assisted electric cylinder comprises a cylinder body, a mounting seat is fixedly mounted on one side of the cylinder body, a first mounting groove is provided in the mounting seat, a piston is slidably mounted in the cylinder body, a push rod is slidably mounted on the cylinder body, one end of the push rod is fixedly connected to the piston, a ball nut is fixedly mounted on the piston, a second mounting groove is provided in the cylinder body, a heat dissipation box is fixedly mounted on the bottom of the cylinder body, a return cavity is provided in the cylinder body, a heat dissipation mechanism is provided in the return cavity, a servo motor is fixedly mounted on one side of the mounting seat, an output shaft of the servo motor is fixedly connected to a driving pulley, a connecting pipe is connected to the cylinder body, and a throttle valve is connected to the connecting pipe.

[0008] Preferably, a connecting rod is fixedly installed on the outer side of the push rod, a fixing block is fixedly installed on the bottom of the cylinder body, a guide rod is slidably installed on the fixing block, and one end of the guide rod is fixedly connected to the outer side of the connecting rod.

[0009] Preferably, a second through hole is opened on the bottom inner wall of the second mounting groove, the second through hole is communicated with the heat dissipation box, a first rotating shaft is rotatably installed in the second through hole, a large bevel gear and a small bevel gear are respectively fixedly installed on the outer side of the ball screw and one end of the first rotating shaft, and the large bevel gear and the small bevel gear are meshed.

[0010] Preferably, a fixing rod is fixedly installed in the heat dissipation box, a second rotating shaft is rotatably installed on the fixing rod, an impeller is fixedly installed on the outer side of the second rotating shaft, and bevel gears are fixedly installed on the other end of the second rotating shaft and the first rotating shaft, and the two bevel gears are meshed.

[0011] Preferably, the heat dissipation mechanism includes a circular heat conductive sheet, the inner wall of the circular cavity is provided with a plurality of heat dissipation holes, the circular heat conductive sheet is fixedly installed in the circular cavity, air vents are provided on the cylinder body and the heat dissipation box, dustproof nets are installed in the two air vents, a ventilation pipe is fixedly connected to the heat dissipation box, and one end of the ventilation pipe is fixedly connected to the circular cavity.

[0012] Preferably, a first through hole is opened on the inner wall of one side of the cylinder body, and the first through hole is communicated with the second mounting groove and the first mounting groove. A ball screw is rotatably installed in the first through hole, and the ball screw is threadedly connected to the ball nut. One end of the ball screw is fixedly connected to a driven pulley, and a synchronous belt is transmission-connected to the driven pulley and the driving pulley.

[0013] In the utility model, the beneficial effects of the pneumatically assisted electric cylinder are:

[0014] 1. This solution provides a circular heat conductive sheet and multiple heat dissipation holes. The heat generated inside the cylinder can be absorbed by the circular heat conductive sheet through the multiple heat dissipation holes, and then the air inside the circular cavity can flow through the two vents, thereby achieving the purpose of heat dissipation inside the cylinder.

[0015] 2. In this solution, when the ball screw rotates, the large bevel gear drives the small bevel gear to rotate, the first shaft drives the bevel gear to rotate, the two bevel gears mesh and rotate, and then the second shaft drives the impeller to rotate. The wind force generated by the rotation of the impeller can quickly discharge the heat inside the return cavity, further improving the heat dissipation effect.

[0016] The utility model can dissipate heat inside the cylinder body during use, thereby preventing the screw rod from being damaged under long-term high-temperature operation, ensuring its service life, and has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a gas pressure-assisted electric cylinder proposed by the utility model;

[0018] Figure 2 A pneumatically assisted electric cylinder proposed in the utility model Figure 1 The enlarged structural diagram of part A in the middle;

[0019] Figure 3 A pneumatically assisted electric cylinder proposed in the utility model Figure 1 Schematic diagram of the enlarged structure of part B.

[0020] In the figure: 1. cylinder body; 2. mounting seat; 3. return cavity; 4. servo motor; 5. driving pulley; 6. synchronous belt; 7. driven pulley; 8. piston; 9. ball nut; 10. ball screw; 11. push rod; 12. connecting rod; 13. fixing block; 14. guide rod; 15. vent; 16. dust screen; 17. large bevel gear; 18. small bevel gear; 19. heat dissipation hole; 20. heat dissipation box; 21. fixing rod; 22. first rotating shaft; 23. bevel gear; 24. second rotating shaft; 25. impeller; 26. return heat conductive sheet. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Embodiment 1

[0023] Reference Figure 1, an electric cylinder with pneumatic assistance, comprising a cylinder body 1, a mounting seat 2 is fixedly installed on one side of the cylinder body 1, a first mounting groove is provided in the mounting seat 2, a piston 8 is slidably installed in the cylinder body 1, a push rod 11 is slidably installed on the cylinder body 1, one end of the push rod 11 is fixedly connected to the piston 8, a ball nut 9 is fixedly installed on the piston 8, a second mounting groove is provided in the cylinder body 1, a heat dissipation box 20 is fixedly installed at the bottom of the cylinder body 1, a return cavity 3 is provided in the cylinder body 1, a heat dissipation mechanism is provided in the return cavity 3, a servo motor 4 is fixedly installed on one side of the mounting seat 2, an output shaft of the servo motor 4 is fixedly connected to a driving pulley 5, a connecting pipe is connected to the cylinder body 1, a throttle valve is connected to the connecting pipe, a connecting rod 12 is fixedly installed on the outside of the push rod 11, a fixing block 13 is fixedly installed on the bottom of the cylinder body 1, a guide rod 14 is slidably installed on the fixing block 13, one end of the guide rod 14 is fixedly connected to the outside of the connecting rod 12, and the bottom of the second mounting groove A second through hole is provided on the inner wall, which is communicated with the heat dissipation box 20, and a first rotating shaft 22 is rotatably installed in the second through hole. A large bevel gear 17 and a small bevel gear 18 are fixedly installed on the outer side of the ball screw 10 and one end of the first rotating shaft 22, respectively. The large bevel gear 17 and the small bevel gear 18 are meshed. When the ball screw 10 rotates, the large bevel gear 17 can drive the small bevel gear 18 to rotate. A first through hole is provided on the inner wall of one side of the cylinder body 1, and the first through hole is communicated with the second mounting groove and the first mounting groove. A ball screw 10 is rotatably installed in the first through hole, and the ball screw 10 is threadedly connected to the ball nut 9. One end of the ball screw 10 is fixedly connected to a driven pulley 7, and a synchronous belt 6 is transmission-connected to the driven pulley 7 and the driving pulley 5. The connecting pipe and the throttle valve both adopt the connecting pipe and throttle valve disclosed in the patent document with announcement number CN112242777B, and their specific structure and connection method have been disclosed and will not be repeated here.

[0024] Reference Figure 2 A fixing rod 21 is fixedly installed in the heat dissipation box 20, and a second rotating shaft 24 is rotatably installed on the fixing rod 21. An impeller 25 is fixedly installed on the outer side of the second rotating shaft 24. Bevel gears 23 are fixedly installed on the other ends of the second rotating shaft 24 and the first rotating shaft 22. The two bevel gears 23 are meshed with each other. When the first rotating shaft 22 rotates, the two bevel gears 23 are meshed for transmission.

[0025] Reference Figure 3 The heat dissipation mechanism includes a circular heat conductive sheet 26, and a plurality of heat dissipation holes 19 are provided on the inner wall of the circular cavity 3. The circular heat conductive sheet 26 is fixedly installed in the circular cavity 3. Vents 15 are provided on the cylinder body 1 and the heat dissipation box 20. Dust-proof nets 16 are installed in the two vents 15. The dust-proof nets 16 can prevent external dust from entering the circular cavity 3. A ventilation pipe is fixedly connected to the heat dissipation box 20, and one end of the ventilation pipe is fixedly connected to the circular cavity 3.

[0026] In this embodiment, when in use, high-pressure gas is pre-filled into the cylinder body 1 through the connecting pipe, so that a pressure difference is generated on the surfaces on both sides of the piston 8 inside the cylinder body 1, forming an outward thrust acting on the push rod 11. During normal operation, the electric cylinder itself drives the push rod 11 to generate thrust, plus the constant thrust generated by the air pressure difference, thereby generating a larger thrust with a smaller size. Through the arrangement of the return-shaped heat conductive sheet 26 and the multiple heat dissipation holes 19, the heat generated inside the cylinder body 1 can be absorbed by the return-shaped heat conductive sheet 26 through the multiple heat dissipation holes 19, and then the air inside the return-shaped cavity 3 can flow through the two vents 15, thereby achieving the purpose of dissipating heat inside the cylinder body 1. At the same time, by turning on the servo motor 4, the servo motor 4 drives the active pulley 5 to rotate, the active pulley 5 drives the driven pulley 7 to rotate through the synchronous belt 6, the driven pulley 7 drives the ball screw 10 to rotate, the ball screw 10 drives the ball nut 9 and the push rod 11 to move horizontally, and at the same time the ball screw 10 drives the large bevel gear 17 to rotate, the large bevel gear 17 drives the small bevel gear 18 to rotate, the small bevel gear 18 drives the first rotating shaft 22 to rotate, the first rotating shaft 22 drives the bevel gear 23 to rotate, the two bevel gears 23 are meshed for transmission, the other bevel gear 23 drives the second rotating shaft 24 to rotate, the second rotating shaft 24 drives the impeller 25 to rotate, the wind force generated by the rotation of the impeller 25 can accelerate the flow of air inside the cavity 3, and further improve the heat dissipation effect inside the cylinder body 1.

[0027] Embodiment 2

[0028] The difference between this embodiment and the first embodiment is that a temperature sensor is provided on the piston 8, a controller and a warning light are fixedly installed on the outer side of the cylinder body 1, the temperature sensor, the controller and the warning light are connected in sequence, and the temperature sensor can monitor the internal temperature of the cylinder body 1 in real time. When the internal temperature exceeds the set threshold, the temperature sensor sends a command to the controller, and the controller controls the warning light to light up, thereby reminding the staff to shut down for maintenance to avoid high temperature damage to the electric cylinder.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatically assisted electric cylinder, comprising a cylinder body (1), characterized in that: A mounting seat (2) is fixedly mounted on one side of the cylinder body (1), a first mounting groove is provided in the mounting seat (2), a piston (8) is slidably mounted in the cylinder body (1), a push rod (11) is slidably mounted on the cylinder body (1), one end of the push rod (11) is fixedly connected to the piston (8), a ball nut (9) is fixedly mounted on the piston (8), a second mounting groove is provided in the cylinder body (1), a heat dissipation box (20) is fixedly mounted on the bottom of the cylinder body (1), a return cavity (3) is provided in the cylinder body (1), a heat dissipation mechanism is provided in the return cavity (3), a servo motor (4) is fixedly mounted on one side of the mounting seat (2), an output shaft of the servo motor (4) is fixedly connected to a driving pulley (5), a connecting pipe is connected to the cylinder body (1), and a throttle valve is connected to the connecting pipe.

2. The pneumatically assisted electric cylinder according to claim 1, characterized in that: A first through hole is provided on an inner wall of one side of the cylinder body (1), the first through hole being in communication with the second mounting groove and the first mounting groove, a ball screw (10) being rotatably mounted in the first through hole, the ball screw (10) being threadedly connected to a ball nut (9), one end of the ball screw (10) being fixedly connected to a driven pulley (7), and a synchronous belt (6) being transmission-connected to the driven pulley (7) and the driving pulley (5).

3. The pneumatically assisted electric cylinder according to claim 2, characterized in that: A connecting rod (12) is fixedly installed on the outer side of the push rod (11), a fixing block (13) is fixedly installed on the bottom of the cylinder body (1), a guide rod (14) is slidably installed on the fixing block (13), and one end of the guide rod (14) is fixedly connected to the outer side of the connecting rod (12).

4. The pneumatically assisted electric cylinder according to claim 3, characterized in that: The heat dissipation mechanism comprises a circular heat conductive sheet (26), the inner wall of the circular cavity (3) is provided with a plurality of heat dissipation holes (19), the circular heat conductive sheet (26) is fixedly installed in the circular cavity (3), the cylinder body (1) and the heat dissipation box (20) are both provided with air vents (15), dustproof nets (16) are installed in the two air vents (15), the heat dissipation box (20) is fixedly connected with a ventilation pipe, and one end of the ventilation pipe is fixedly connected with the circular cavity (3).

5. The pneumatically assisted electric cylinder according to claim 4, characterized in that: A second through hole is formed on the inner wall of the bottom of the second mounting groove, the second through hole is communicated with the heat dissipation box (20), a first rotating shaft (22) is rotatably mounted in the second through hole, a large bevel gear (17) and a small bevel gear (18) are respectively fixedly mounted on the outer side of the ball screw (10) and one end of the first rotating shaft (22), and the large bevel gear (17) and the small bevel gear (18) are meshed.

6. The pneumatically assisted electric cylinder according to claim 5, characterized in that: A fixing rod (21) is fixedly installed in the heat dissipation box (20), a second rotating shaft (24) is rotatably installed on the fixing rod (21), an impeller (25) is fixedly installed on the outer side of the second rotating shaft (24), and a bevel gear (23) is fixedly installed on the other end of the second rotating shaft (24) and the first rotating shaft (22), and the two bevel gears (23) are meshed with each other.

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