A coaxial electric cylinder

Abstract

This invention relates to a coaxial electric cylinder, belonging to the field of mechanical engineering. It includes an actuator body, a reducer mounted on the actuator body, and a drive assembly mounted on the reducer for providing driving force. The drive assembly, reducer, and actuator body are sequentially connected and coaxially arranged. The lower end of the drive assembly has a downwardly protruding end cap with reinforcing ribs circumferentially. The upper center of the reducer has a coaxial groove for coaxial insertion of the end cap. The reducer has a circumferentially formed ring platform for engaging the lower edge of the drive assembly, and the ring platform has a circumferentially formed positioning notch for engaging the reinforcing ribs for rotational limiting. This invention improves transmission efficiency, reduces energy loss, and reduces radial space occupation, making it suitable for compact equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical engineering, in particular to a coaxial electric cylinder. BACKGROUND

[0002] The electric cylinder is a modular product integrating servo motor and screw rod, which can convert the rotary motion of servo motor into linear motion, and is widely used in papermaking, chemical industry, automobile, electronics, mechanical automation, welding and other industries.

[0003] The electric cylinder generally comprises a motor, a reducer and an actuator, the actuator comprises a shell, a screw rod connected with the reducer and a push rod driven by the screw rod and in telescopic cooperation with the shell. The general electric cylinder currently used is generally arranged in parallel or perpendicular to the screw rod, and then power transmission is realized through synchronous pulley or bevel gear mechanism.

[0004] However, the above installation method will increase the radial volume of the whole device, which is not suitable for use in compact devices, and will also reduce the transmission efficiency, which is not suitable for high-speed operation. SUMMARY

[0005] In order to reduce the radial volume of the device and improve the transmission efficiency, the present application provides a coaxial electric cylinder.

[0006] The coaxial electric cylinder provided by the present application adopts the following technical scheme:

[0007] A coaxial electric cylinder comprises an actuator body and a reducer installed on the actuator body, and further comprises a driving assembly installed on the reducer for providing driving force, the driving assembly, the reducer and the actuator body are sequentially connected in transmission and coaxially arranged;

[0008] The lower end of the driving assembly has a downwardly protruding end cover, and the end cover has a reinforcing rib in the circumferential direction, the middle part of the upper end of the reducer has a coaxial slot for coaxially inserting the end cover, the reducer has a ring table in the circumferential direction for clamping and cooperating with the lower end edge of the driving assembly, and the ring table is provided with a positioning notch in the circumferential direction for clamping the reinforcing rib to limit rotation.

[0009] By adopting the above technical scheme, the output shaft of the driving assembly, the rotating shaft of the reducer and the screw rod are all located on the same axis, so that the transmission efficiency is improved, the energy loss is reduced, and the space occupation in the radial direction is reduced, which is suitable for compact devices.

[0010] Optionally, the reducer comprises a reducer shell, an inner gear ring installed in the reducer shell, a planetary gear set engaged with the inner gear ring and used for multi-stage rotation reduction, and a sun gear output frame connecting the actuator body and the planetary gear set.

[0011] The outer side of the internal gear ring is provided with a circular groove that matches the reducer housing, and a limiting pin is inserted into the circular groove to limit the rotation of the reducer housing and the internal gear ring. The sun gear output frame is rotatably connected to the reducer housing.

[0012] The coaxial groove is located on the internal gear ring, and the planetary gear set meshes with the output shaft of the drive assembly.

[0013] By adopting the above technical solution, the high speed of the motor is reduced, while the torque is proportionally amplified, enabling the electric cylinder to drive a larger load. At the same time, the installation method of the internal gear ring is simpler and faster.

[0014] Optionally, the actuator body includes an actuator housing, a lead screw rotatably mounted inside the actuator housing, a segmented sliding sleeve mounted on the outside of the lead screw and slidably disposed with respect to the actuator housing, and a push rod; the lead screw is spline-connected to the reducer, the lead screw has a first threaded section, and the segmented sliding sleeve is threadedly connected to the outside of the first threaded section;

[0015] The segmented sliding sleeve includes a limiting sleeve, a front sliding sleeve made of metal, and a rear sliding sleeve made of plastic. The front sliding sleeve and the rear sliding sleeve are both fixedly installed inside the limiting sleeve and threadedly connected to the lead screw. The limiting sleeve has a first limiting structure between itself and the inner wall of the actuator housing to restrict the rotation of the limiting sleeve.

[0016] The push rod is telescopically installed inside the actuator housing. The push rod is fixedly connected to the outside of the limiting sleeve and is slidably and sealed to the end of the actuator housing.

[0017] By adopting the above technical solution, the metal front slide sleeve can withstand greater forces during operation, thereby improving the overall service life, while the plastic rear slide sleeve works in conjunction with the front slide sleeve during operation without the need for long-term lubrication and maintenance, thus reducing costs.

[0018] Optionally, a sealing packing assembly for limiting and sealing the lead screw is provided between the reducer housing and the actuator housing. The sealing packing assembly is sleeved on the outside of the lead screw and is sealed and fixedly connected to the reducer housing and the actuator housing.

[0019] By adopting the above technical solution, when the lead screw is running normally, the sealing packing assembly supports the rotation direction of the lead screw, avoiding the lead screw from shaking during operation, which would lead to low transmission efficiency or even damage to the equipment.

[0020] Optionally, the actuator body further includes a dust collection structure for collecting dust adsorbed on the outer surface of the push rod, a follower negative pressure suction component for sucking up the dust and driving it toward the dust collection structure, and a dust collection connector detachably connected to the end of the push rod for cleaning and removing the dust collected by the dust collection structure.

[0021] The follow-up negative pressure suction component includes a first sealing sleeve and a second sealing sleeve sleeved on the outside of the lead screw. The first sealing sleeve is close to the first threaded section, and the second sealing sleeve is located at the end of the lead screw. A first chamber is formed between the first sealing sleeve and the second sealing sleeve. A second chamber is formed between the second sealing sleeve and the end of the push rod. When the push rod extends or retracts on the actuator housing, the first sealing sleeve and the second sealing sleeve move away from or closer to each other to allow air to be drawn in or expelled through the first chamber.

[0022] The push rod has a side wall through-hole that extends into the second chamber and allows air and dust to pass through;

[0023] The second sealing sleeve is provided with a plurality of one-way connecting pipes and a plurality of second one-way valves; the one-way connecting pipes are only open when the push rod is fully retracted and the direction of the flow is from the second chamber to the first chamber, and the direction of the flow of the second one-way valves is from the first chamber to the second chamber.

[0024] By adopting the above technical solution, the first sealing sleeve and the second sealing sleeve move relative to each other inside the push rod as the lead screw moves, thereby synchronously driving the dust into the dust collection structure for collection, and preventing the dust from moving into the equipment with the push rod and causing damage to the equipment.

[0025] Optionally, the one-way connecting pipe has an air passage connecting the first chamber and the second chamber; a first one-way valve is provided at the opening of the air passage near the second chamber, and the first one-way valve allows air to flow from the second chamber to the first chamber;

[0026] The one-way connecting pipe is telescopically installed on the second sealing sleeve, and a drive spring is provided on the outside of the one-way connecting pipe to drive the one-way connecting pipe to always move towards the second chamber to isolate the air passage from the first chamber.

[0027] The second chamber is provided with an abutment plate. When the push rod is fully retracted, the abutment plate abuts against the one-way connecting pipe and drives the one-way connecting pipe to move toward the first chamber to connect the air passage with the first chamber.

[0028] By adopting the above technical solution, the first chamber can expel air when the push rod extends and seal itself to form a negative pressure state when the push rod retracts. Finally, when the push rod is fully retracted, it connects with the second chamber, thereby sucking in dust and collecting the dust on the outside of the push rod in conjunction with the dust collection structure.

[0029] Optionally, the first sealing sleeve is fixedly connected to the outside of the lead screw, and the first sealing sleeve slides relative to and seals against the inner wall of the push rod; the lower end of the lead screw is connected to a second threaded section, the second threaded section having a thread direction opposite to that of the first threaded section; the second sealing sleeve is threadedly connected to the second threaded section; a second limiting structure is provided between the second sealing sleeve and the inner wall of the push rod to restrict the circumferential rotation of the second sealing sleeve to achieve relative sliding with the push rod; the second sealing sleeve is sealed between itself, the inner wall of the push rod, and the lead screw;

[0030] The abutment plate is fixedly connected to the end of the lead screw.

[0031] By adopting the above technical solution, the second sealing sleeve moves in the opposite direction to the push rod. While the push rod is moving, the first chamber circulates in exhaust, negative pressure and suction, continuously collecting dust without the need for an additional power source.

[0032] Optionally, the first sealing sleeve is fixedly connected to the inner wall of the push rod, and the first sealing sleeve slides relative to the lead screw and seals against it; the second sealing sleeve is fixedly sleeved on the outer side of the lead screw, and the second sealing sleeve slides relative to the inner wall of the push rod and seals against it.

[0033] The abutment plate is fixedly connected to the inner wall of the push rod.

[0034] By adopting the above technical solution, the first sealing sleeve moves synchronously with the push rod. While the push rod moves, the first chamber circulates in exhaust, negative pressure and suction, continuously collecting dust without the need for an additional power source.

[0035] Optionally, the dust collection structure includes a dust removal scraper ring disposed at the end of the actuator housing and a dust collection filter cartridge for filtering air and collecting dust; the dust collection filter cartridge is disposed in the second chamber and connected to the dust collection connector;

[0036] The dust removal scraper ring is sealed to the outer wall of the push rod, and a dust collection ring groove is formed between them; the side wall through holes are circumferentially spaced on the outer side of the end of the push rod, and the dust collection ring groove and the side wall through holes are directly opposite each other when the push rod is fully retracted;

[0037] The second chamber has a baffle plate for inserting the dust collection filter cartridge to force air to pass only through the dust collection filter cartridge.

[0038] By adopting the above technical solution, the dust removal scraper ring collects the dust that follows the push rod back into the dust collection ring groove, which facilitates the subsequent entry of dust into the second chamber. After the dust enters the second chamber, it is filtered by the dust collection filter cartridge to prevent dust from entering the first chamber. At the same time, the dust collection connector can be opened to clean the dust in the dust collection filter cartridge, making the operation convenient.

[0039] Optionally, the side wall through hole is provided with a third one-way valve for allowing air and dust to enter the second chamber unidirectionally from the outside; the dust collection connector has a fourth one-way valve for discharging air from the second chamber to the outside unidirectionally.

[0040] By adopting the above technical solution, dust can be collected by the dust collection filter cartridge through the third one-way valve when the push rod is fully retracted, and will not be discharged to the outside in the opposite direction with the air when the first chamber is vented, causing pollution. At the same time, the fourth one-way valve can discharge the gas in the second chamber to avoid the formation of a high-pressure state.

[0041] In summary, the present invention has at least one of the following beneficial technical effects:

[0042] 1. The drive assembly, reducer, and actuator body are sequentially connected and coaxially arranged. The end cover is inserted into the coaxial groove, the reinforcing rib is inserted into the positioning notch, and the drive assembly is fixedly connected to the reducer housing. This ensures that the output shaft of the drive assembly, the rotating shaft of the reducer, and the lead screw are all located on the same axis, which improves transmission efficiency, reduces energy loss, and reduces radial space occupation, making it suitable for compact equipment.

[0043] 2. Both the front and rear sliding sleeves are fixedly installed inside the limit sleeve and threadedly connected to the first threaded section of the lead screw. The limit sleeve is slidably connected to the inner wall of the actuator housing. The front sliding sleeve is made of copper and the rear sliding sleeve is made of plastic. The metal front sliding sleeve can withstand greater forces during operation, thus improving the overall service life. The plastic rear sliding sleeve works in conjunction with the front sliding sleeve during operation and does not require long-term lubrication maintenance, thus reducing costs.

[0044] 3. The drive assembly rotates the lead screw, causing the push rod to extend along the actuator housing. Simultaneously, the second sealing sleeve and the first sealing sleeve move towards each other, allowing air in the first chamber to flow into the second chamber through the second one-way valve. The lead screw rotates in the opposite direction, causing the push rod to retract. At the same time, the second sealing sleeve and the first sealing sleeve move relative to each other, increasing the volume of the sealed first chamber and gradually creating a negative pressure. Air in the second chamber is discharged through the fourth one-way valve. When the push rod is fully retracted, the first and second chambers are connected in one direction. Under atmospheric pressure, outside air flows through the third one-way valve, carrying dust from the dust collection ring groove into the first chamber. Air enters the first chamber along the dust collection filter cartridge, the first one-way valve, and the air passage. The dust is intercepted and collected by the dust collection filter cartridge. Regularly disassembling the dust collection connector and cleaning the dust collection filter cartridge prevents dust from being carried into the equipment and causing damage when the push rod retracts. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of a coaxial electric cylinder according to Embodiment 1 of this application;

[0046] Figure 2 This is a schematic diagram of the connection between the drive assembly and the reducer in Embodiment 1 of this application;

[0047] Figure 3 This is a cross-sectional view of the reducer according to Embodiment 1 of this application;

[0048] Figure 4 This is a cross-sectional view of the actuator body and sealing packing assembly of Embodiment 1 of this application;

[0049] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0050] Figure 6 yes Figure 4 Enlarged view of point B in the middle;

[0051] Figure 7 This is a schematic diagram of the structure of the second sealing sleeve of the follow-up negative pressure suction component in Embodiment 2 of this application;

[0052] Figure 8 This is a cross-sectional view of the second sealing sleeve of the follow-up negative pressure suction component in Embodiment 2 of this application;

[0053] Figure 9 This is a cross-sectional view of the fourth check valve in Embodiment 2 of this application;

[0054] Figure 10 This is a cross-sectional view of the second sealing sleeve of the follow-up negative pressure suction component in Embodiment 3 of this application.

[0055] The parts referred to by the numbers in the above attached figures are as follows: 1. Drive assembly; 11. End cover; 111. Reinforcing rib; 2. Reducer; 21. Reducer housing; 211. Coaxial groove; 212. Ring platform; 213. Positioning notch; 22. Internal gear ring; 23. Limiting pin; 24. Planetary gear set; 25. Sun gear output frame; 3. Sealing packing assembly; 31. Sealing housing; 32. Sealing ring; 33. Locking block; 4. Actuator body; 41. Actuator housing; 42. Lead screw; 421. First threaded section; 422. Second threaded section; 43. Segmented sliding sleeve; 431. Limiting sleeve; 432. Front sliding sleeve; 43 3. Rear end sleeve; 44. Push rod; 45. Follow-up negative pressure suction component; 451. First sealing sleeve; 452. Second sealing sleeve; 453. One-way connecting pipe; 4531. Drive spring; 4532. First one-way valve; 454. Second one-way valve; 455. Third one-way valve; 456. Abutment plate; 457. First chamber; 458. Second chamber; 46. Dust collection structure; 461. Dust removal scraper ring; 462. Dust collection ring groove; 463. Dust collection filter cartridge; 464. Baffle plate; 465. Connecting rod; 47. Dust collection connector; 471. Fourth one-way valve; 4711. Valve body; 4712. Push plate; 4713. Force spring. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0057] This invention discloses a coaxial electric cylinder.

[0058] Example 1:

[0059] Reference Figure 1 A coaxial electric cylinder includes an actuator body 4, a reducer 2, a drive assembly 1, and a sealing packing assembly 3. The drive assembly 1, reducer 2, sealing packing assembly 3, and actuator body 4 are sequentially connected and coaxially arranged. The actuator body 4 is the actuating element used for extension and retraction. The drive assembly 1 drives the actuator body 4. The reducer 2 reduces the speed of the drive assembly 1. The sealing packing assembly 3 acts as a connector between the reducer 2 and the actuator body 4, isolating and sealing them.

[0060] Reference Figure 2 and Figure 3 The drive assembly 1 is configured as a servo motor, and the lower end of the drive assembly 1 has a downwardly protruding end cover 11. The output shaft of the drive assembly 1 extends out from the end cover 11. The end cover 11 has reinforcing ribs 111 around its circumference. In this embodiment, the reinforcing ribs 111 are spaced apart around the circumference, are long strips, and are arranged radially.

[0061] The reducer 2 includes a reducer housing 21, an internal gear ring 22, a planetary gear set 24, and a sun gear output frame 25.

[0062] The internal gear ring 22 is fixedly mounted inside the reducer housing 21, and the sun gear output carrier 25 is rotatably mounted inside the reducer housing 21. The planetary gear set 24 is a multi-stage planetary gear system. The planetary gear set 24 is fixedly mounted on the sun gear output carrier 25 and meshes with the internal gear ring 22. Specifically, the rotation axes of the planetary gears in the planetary gear set 24 are fixed on the sun gear output carrier 25, so that the planetary gears can rotate on the sun gear output carrier 25, and the planetary gears mesh circumferentially with the internal gear ring 22, so that the planetary gears revolve around the central axis of the sun gear output carrier 25.

[0063] The reducer housing 21 has a circumferential platform 212, and the platform 212 has locating notches 213 spaced out circumferentially. The top of the internal gear ring 22 is recessed downward and has a coaxial groove 211, which is coaxially arranged with the central axis of the internal gear ring 22.

[0064] To prevent relative rotation between the reducer housing 21 and the internal gear ring 22, a circular groove is formed on the outer side of the internal gear ring 22 to match the reducer housing 21. Specifically, both the internal gear ring 22 and the inner wall of the reducer housing 21 have a semi-circular arc groove, which together form a circular groove. A limit pin 23 is inserted into the circular groove to restrict circumferential rotation between the two.

[0065] When coaxially installing the drive assembly 1 and the reducer 2, first insert the output shaft of the drive assembly 1 into the middle of the planetary gear set 24 and mesh with the planetary gears therein. At the same time, insert the end cover 11 of the drive assembly 1 into the coaxial groove 211. Then, snap the lower edge of the drive assembly 1 into the ring platform 212. At this time, rotate the drive assembly 1 to adjust it so that the reinforcing rib 111 can be snapped into the positioning notch 213, thereby forming a circumferential limit. Finally, fix it circumferentially with bolts.

[0066] The above installation method ensures that the output shaft of the drive assembly 1, the rotating shaft of the sun gear output carrier 25, and the actuator body 4 are all located on the same axis, which improves transmission efficiency, reduces energy loss, and reduces radial space occupation, making it suitable for compact equipment.

[0067] Reference Figure 4 and Figure 5 The actuator body 4 includes an actuator housing 41, a lead screw 42, a segmented sliding sleeve 43, and a push rod 44.

[0068] The actuator housing 41 is a cylindrical body with openings at both ends and a hollow interior.

[0069] The lead screw 42 is rotatably mounted in the inner cavity of the actuator housing 41, and the lead screw 42 has a first threaded section 421.

[0070] The segmented sliding sleeve 43 includes a limiting sleeve 431, a front sliding sleeve 432, and a rear sliding sleeve 433. The limiting sleeve 431 is a circular sleeve, and the front sliding sleeve 432 and the rear sliding sleeve 433 are both fixedly installed inside the limiting sleeve 431 and abut against each other. Simultaneously, the front sliding sleeve 432 and the rear sliding sleeve 433 are both threadedly installed on the first threaded section 421 of the lead screw 42. In this embodiment, the front sliding sleeve 432 is made of metal, such as copper, and the rear sliding sleeve 433 is made of plastic.

[0071] A first limiting structure is provided between the limiting sleeve 431 and the actuator housing 41, which restricts the circumferential rotation of the segmented sliding sleeve 43. In this embodiment, the first limiting structure includes a first sliding groove provided along the length of the inner wall of the actuator housing 41 and a first sliding notch formed on the outer side of the limiting sleeve 431 that cooperates with the first sliding groove.

[0072] When the lead screw 42 rotates, the limiting sleeve 431 is limited, so the segmented sliding sleeve 43 can only slide along the length direction of the lead screw 42, and the limiting sleeve 431 slides relative to the actuator housing 41.

[0073] The push rod 44 is a hollow cylinder with open ends. It is telescopically installed inside the actuator housing 41. One end of the push rod 44 is fixedly connected to the limiting sleeve 431, and the other end extends out of the actuator housing 41. The lead screw 42 passes through the push rod 44. When the lead screw 42 drives the segmented sliding sleeve 43 to slide, the push rod 44 slides synchronously, that is, the push rod 44 telescopically extends and retracts inside the actuator housing 41.

[0074] The sealing packing assembly 3 includes a sealing housing 31, a sealing ring 32, and a locking block 33. Both the sealing ring 32 and the locking block 33 are installed inside the sealing housing 31.

[0075] When the actuator body 4 is connected to the reducer 2, the lead screw 42 passes through the sealing housing 31 and is splinedly connected to the sun gear output bracket 25. The sealing ring 32 is fitted on the outside of the lead screw 42, and the sealing ring 32 seals against both the outer wall of the lead screw 42 and the inner wall of the sealing housing 31. The locking block 33 is tightened onto the sealing ring 32 by threads to ensure the sealing performance of the lead screw 42 and the stability of its rotational operation.

[0076] The actuator housing 41, the sealing housing 31, and the reducer housing 21 are sequentially sealed and fixedly connected.

[0077] The drive assembly 1 operates and drives the sun gear output carrier 25 to rotate through multi-stage reduction via the planetary gear set 24. The sun gear output carrier 25 drives the lead screw 42 to rotate. Under the constraint of the first limiting structure, the limiting sleeve 431 moves relative to the lead screw 42 along with the segmented sliding sleeve 43, thereby driving the push rod 44 to extend from the end of the actuator housing 41. The half-copper, half-plastic design of the segmented sliding sleeve 43 can reduce the frequency of lubricant addition compared to a pure copper sliding sleeve, and can increase the service life compared to a pure plastic sliding sleeve, thus reducing overall maintenance and repair costs.

[0078] Example 2:

[0079] The coaxial electric cylinder of Embodiment 2 is the same as that of Embodiment 1, except that a dust removal structure is provided on the actuator body 4. The rest of the structure is the same and will not be described in detail here.

[0080] Reference Figure 4 and Figure 6 The actuator body 4 also includes a follow-up negative pressure suction component 45, a dust collection structure 46, and a dust collection connector 47. The dust collection structure 46 is used to collect dust adsorbed on the outer surface of the push rod 44, the follow-up negative pressure suction component 45 is used to suck up the dust and drive it toward the dust collection structure 46, and the dust collection connector 47 is used to clean and remove the dust collected by the dust collection structure 46.

[0081] The follow-up negative pressure suction component 45 includes a first sealing sleeve 451 and a second sealing sleeve 452, both located within the inner cavity of the actuator housing 41. The first sealing sleeve 451 is positioned closer to the first threaded section 421, while the second sealing sleeve 452 is positioned further away from the first threaded section 421. A first chamber 457 is formed between the first sealing sleeve 451 and the second sealing sleeve 452, and a second chamber 458 is formed between the second sealing sleeve 452 and the end of the push rod 44. The first sealing sleeve 451 and the second sealing sleeve 452 are capable of relative movement within the inner cavity of the actuator housing 41, thereby compressing or expanding the first chamber 457.

[0082] Reference Figure 6 , Figure 7 and Figure 8 The second sealing sleeve 452 is provided with a plurality of one-way connecting pipes 453 and a plurality of second one-way valves 454. Both the one-way connecting pipes 453 and the second one-way valves 454 have a one-way flow function. The one-way connecting pipes 453 are used to allow air to flow unidirectionally from the second chamber 458 into the first chamber 457. The second one-way valves 454 are used to allow air to flow unidirectionally from the first chamber 457 into the second chamber 458.

[0083] To achieve the effect of delayed opening of the one-way connecting pipe 453, the one-way connecting pipe 453 is telescopically installed on the second sealing sleeve 452. The one-way connecting pipe 453 has an air passage connecting the first chamber 457 and the second chamber 458, and a first one-way valve 4532 is provided at the opening of the air passage near the second chamber 458. The first one-way valve 4532 allows air to flow unidirectionally from the second chamber 458 into the first chamber 457.

[0084] Meanwhile, a drive spring 4531 is sleeved on the outside of the one-way connecting pipe 453. The two ends of the drive spring 4531 are fixedly connected to the one-way connecting pipe 453 and the second sealing sleeve 452 respectively. The drive spring 4531 drives the one-way connecting pipe 453 to always have the tendency to move towards the second chamber 458 to isolate the air passage from the first chamber 457.

[0085] Furthermore, an abutment plate 456 is fixedly installed inside the second chamber 458. When the first one-way valve 4532 abuts against the abutment plate 456, the abutment plate 456 drives the one-way connecting pipe 453 to extend and retract within the second sealing sleeve 452. At this time, the drive spring 4531 is compressed, and one end of the one-way connecting pipe 453 extends into the first chamber 457, so that one end of the air passage inlet is located in the first chamber 457, and the one-way connecting pipe 453 is open. When the first one-way valve 4532 is not abutting against the abutment plate 456, the one-way connecting pipe 453 is completely inside the second sealing sleeve 452 under the elastic force of the drive spring 4531, so that the air passage is isolated from the first chamber 457, and the one-way connecting pipe 453 cannot be open.

[0086] In this embodiment, the lower end of the second threaded section 422 of the lead screw 42 is integrally provided with a second threaded section 422, and the thread direction of the second threaded section 422 is opposite to that of the first threaded section 421. The first sealing sleeve 451 is fixedly connected to the outside of the lead screw 42 and is located between the first threaded section 421 and the second threaded section 422. The first sealing sleeve 451 slides relative to and seals against the inner wall of the push rod 44. The second sealing sleeve 452 is threadedly connected to the second threaded section 422, and the second sealing sleeve 452 is sealed between itself and the inner wall of the push rod 44 and the lead screw 42.

[0087] The second sealing sleeve 452 and the inner wall of the push rod 44 have a second limiting structure that restricts the circumferential rotation of the second sealing sleeve 452 to achieve relative sliding with the push rod 44. The second limiting structure includes a second sliding groove provided along the length of the inner wall of the push rod 44 and a second sliding notch formed on the outer side of the second sealing sleeve 452 that cooperates with the second sliding groove. When the lead screw 42 rotates, the second sealing sleeve 452 can slide on the second threaded section 422.

[0088] The abutment plate 456 is fixedly connected to the end of the lead screw 42.

[0089] When the lead screw 42 rotates and drives the push rod 44 to extend outward toward the actuator housing 41, the second sealing sleeve 452 can slide on the second threaded section 422 and the distance between it and the first sealing sleeve 451 gradually decreases, while the distance between the second sealing sleeve 452 and the abutment plate 456 gradually increases. At this time, the first chamber 457 is compressed, and the air in the first chamber 457 is discharged to the second chamber 458 through the second one-way valve 454.

[0090] When the lead screw 42 rotates and drives the push rod 44 to retract, the second sealing sleeve 452 can slide on the second threaded section 422 and the distance between it and the first sealing sleeve 451 gradually increases, while the distance between the second sealing sleeve 452 and the abutment plate 456 gradually decreases. Since the abutment plate 456 has not yet abutted against the first one-way valve 4532 on the second sealing sleeve 452, the one-way connecting pipe 453 is not open. At this time, the air pressure in the first chamber 457 gradually decreases, thus forming a negative pressure.

[0091] When the push rod 44 is fully retracted, the abutment plate 456 abuts against the first one-way valve 4532 on the second sealing sleeve 452. At this time, the one-way connecting pipe 453 is opened. Because there is negative pressure in the first chamber 457, the air in the second chamber 458 is drawn into the first chamber 457.

[0092] The dust collection connector 47 is detachably connected to the end of the push rod 44. The dust collection connector 47 has a fourth one-way valve 471 for unidirectionally discharging air from the second chamber 458 to the outside and a filter screen for air-only passage.

[0093] The dust collection structure 46 includes a dust removal scraper ring 461 and a dust collection filter cartridge 463. The dust removal scraper ring 461 is fixedly installed at the end of the actuator housing 41, and is sealed to the outer wall of the push rod 44 while being able to slide relative to it. A dust collection ring groove 462 is formed between the dust removal scraper ring 461 and the outer wall of the push rod 44. When the push rod 44 retracts, the dust adsorbed on the outer wall of the push rod 44 can be scraped off and collected in the dust collection ring groove 462.

[0094] The push rod 44 has a circumferentially circumferentially perforated sidewall through-holes extending into the second chamber 458 for the passage of air and dust. Multiple sidewall through-holes are provided, and a third one-way valve 455 is installed within each through-hole to allow air and dust to enter the second chamber 458 unidirectionally from the outside. When the push rod 44 is fully retracted, the sidewall through-holes are aligned with the dust collection ring groove 462.

[0095] The dust collection filter cartridge 463 is a cylinder open at one end, with its surface covered with pores that allow only air to pass through. A baffle plate 464 is fixedly installed inside the second chamber 458. The dust collection filter cartridge 463 is disposed inside the second chamber 458 and passes through the baffle plate 464. The baffle plate 464 is used to insert the dust collection filter cartridge 463 so that air can only pass through the dust collection filter cartridge 463. The baffle plate 464 and the dust collection filter cartridge 463 are sealed and abutted by a sealing ring. The open end of the dust collection filter cartridge 463 faces the side of the second chamber 458 where there is a side wall through hole. At the same time, the dust collection filter cartridge 463 and the dust collection connector 47 are detachably connected by a connecting rod 465, allowing air and dust to pass between the dust collection filter cartridge 463 and the dust collection connector 47.

[0096] Reference Figure 9 In this embodiment, the first one-way valve 4532, the second one-way valve 454, the third one-way valve 455, and the fourth one-way valve 471 all adopt the same structure, including a valve body 4711, a push plate 4712, and a force spring 4713. The push plate 4712 is slidably mounted inside the valve body 4711 and is sealed. The force spring 4713 is located inside the valve body 4711 and is fixedly connected to the push plate 4712 and the valve body 4711. The push plate 4712 separates the input end and the output end of the valve body 4711. When gas and dust enter from the input end, the push plate 4712 is pushed, thereby compressing the force spring 4713 to connect the input end and the output end of the valve body 4711.

[0097] Reference Figure 6 When the push rod 44 extends outward on the actuator housing 41, the first chamber 457 exhausts air into the second chamber 458, and the air flows out through the fourth check valve 471.

[0098] When push rod 44 is fully retracted, due to the negative pressure in the first chamber 457, external air enters the second chamber 458 through the third one-way valve 455 and then enters the first chamber 457 through the first one-way valve 4532. Since the side wall through-hole is aligned with the dust collection ring groove 462, dust in the dust collection ring groove 462 can enter the second chamber 458 through the side wall through-hole and be collected in the dust collection filter cartridge 463. To clean the dust in the dust collection filter cartridge 463, simply disassemble the dust collection connector 47.

[0099] Example 3:

[0100] Compared with Embodiment 2, this embodiment is identical in all aspects except for the connection method of the first sealing sleeve 451, the second sealing sleeve 452 and the abutment plate 456, and the fact that the lead screw 42 may not have the second threaded section 422.

[0101] Reference Figure 4 and Figure 10In this embodiment, the first sealing sleeve 451 is fixedly connected to the inner wall of the push rod 44, and the first sealing sleeve 451 slides relative to and seals against the lead screw 42. The lower end of the second threaded section 422 of the lead screw 42 extends to form a shaft section for the fixed installation of the second sealing sleeve 452, and the second sealing sleeve 452 slides relative to and seals against the inner wall of the push rod 44. The abutment plate 456 is fixedly connected to the inner wall of the push rod 44 and is located in the second chamber 458.

[0102] When the lead screw 42 rotates and drives the push rod 44 to extend outward toward the actuator housing 41, the first sealing sleeve 451 can slide on the surface of the lead screw 42 during the extension and retraction of the push rod 44 and the distance between it and the second sealing sleeve 452 gradually decreases, while the distance between the second sealing sleeve 452 and the abutment plate 456 gradually increases. At this time, the first chamber 457 is compressed, and the air in the first chamber 457 is discharged to the second chamber 458 through the second one-way valve 454.

[0103] When the lead screw 42 rotates and drives the push rod 44 to retract, the distance between the second sealing sleeve 452 and the first sealing sleeve 451 gradually increases, while the distance between the second sealing sleeve 452 and the abutment plate 456 gradually decreases. Since the abutment plate 456 has not yet come into contact with the first one-way valve 4532 on the second sealing sleeve 452, the one-way connecting pipe 453 is not open, and at this time the air pressure in the first chamber 457 gradually decreases, thus forming a negative pressure.

[0104] When the push rod 44 is fully retracted, the abutment plate 456 abuts against the first one-way valve 4532 on the second sealing sleeve 452. At this time, the one-way connecting pipe 453 is opened. Because there is negative pressure in the first chamber 457, the air in the second chamber 458 is drawn into the first chamber 457.

[0105] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A coaxial electric cylinder comprising an actuator body (4) and a reducer (2) mounted on the actuator body (4), characterized in that: Also include the drive assembly (1) installed on the reducer (2) for providing driving force, the drive assembly (1), reducer (2) and actuator body (4) are in turn transmission connection and coaxial arrangement; The drive assembly (1) has a downward protruding end cover (11) at the lower end, and the end cover (11) has a reinforcing rib (111) circumferentially, the reducer (2) has a coaxial slot (211) for the end cover (11) coaxially inserted in the middle of the upper end, the reducer (2) has a ring table (212) for the lower end edge of the drive assembly (1) to be clamped and matched, and the ring table (212) is provided with a positioning notch (213) circumferentially for the reinforcing rib (111) to be clamped in for rotation limiting; The reducer (2) comprises a reducer housing (21), an inner ring gear (22) installed in the reducer housing (21), a planetary gear set (24) engaged with the inner ring gear (22) and multi-stage matched for rotation reduction, and a sun gear output frame (25) connecting the actuator body (4) and the planetary gear set (24); The inner ring gear (22) is provided with a circular groove on the outer side of the reducer housing (21), and a limiting column (23) for limiting the rotation of the reducer housing (21) and the inner ring gear (22) is inserted in the circular groove, and the sun gear output frame (25) is rotationally connected with the reducer housing (21); The coaxial slot (211) is located in the inner ring gear (22), and the planetary gear set (24) is engaged with the output shaft of the drive assembly (1); The actuator body (4) comprises an actuator housing (41), a screw rod (42) rotationally installed inside the actuator housing (41), a segmented sliding sleeve (43) installed outside the screw rod (42) and slidingly arranged with the actuator housing (41), and a push rod (44); the screw rod (42) is connected with the reducer (2) by spline, the screw rod (42) has a first threaded segment (421), and the segmented sliding sleeve (43) is threadedly connected outside the first threaded segment (421); The segmented sliding sleeve (43) comprises a limiting sleeve (431), a front end sliding sleeve (432) of metal material and a rear end sliding sleeve (433) of plastic material, the front end sliding sleeve (432) and the rear end sliding sleeve (433) are fixedly installed inside the limiting sleeve (431) and are threadedly connected with the screw rod (42); the limiting sleeve (431) and the inner wall of the actuator housing (41) have a first limiting structure limiting the rotation of the limiting sleeve (431); The push rod (44) is telescopically installed in the actuator housing (41), the push rod (44) is fixedly connected with the outer side of the limiting sleeve (431) and sealingly and slidingly connected with the end of the actuator housing (41).

2. The coaxial cable of claim 1, wherein: A sealing packing assembly (3) for limiting and sealing the screw rod (42) is arranged between the reducer housing (21) and the actuator housing (41), and the sealing packing assembly (3) is sleeved outside the screw rod (42) and sealingly fixedly connected with the reducer housing (21) and the actuator housing (41).

3. The coaxial cable of claim 1, wherein: The actuator body (4) further comprises a dust collecting structure (46) for collecting dust adsorbed on the outer surface of the push rod (44), a follow-up negative pressure suction component (45) for sucking and driving dust to the dust collecting structure (46), and a dust collecting connector (47) detachably connected to the end of the push rod (44) and used for cleaning and taking out the dust collected by the dust collecting structure (46); The follow-up negative pressure suction component (45) comprises a first sealing sleeve (451) and a second sealing sleeve (452) sleeved outside the screw rod (42), the first sealing sleeve (451) is close to the first threaded section (421), and the second sealing sleeve (452) is located at the end of the screw rod (42); a first cavity (457) is formed between the first sealing sleeve (451) and the second sealing sleeve (452); a second cavity (458) is formed between the second sealing sleeve (452) and the end of the push rod (44); when the push rod (44) is extended and retracted on the actuator housing (41), the first sealing sleeve (451) and the second sealing sleeve (452) relatively move away from or close to each other to inhale or exhaust air through the first cavity (457); The push rod (44) is provided with a side wall through hole penetrating into the second cavity (458) and used for passing air and dust; The second sealing sleeve (452) is provided with a plurality of one-way communication pipes (453) and a plurality of second one-way valves (454); the one-way communication pipe (453) is only conducted when the push rod (44) is completely retracted, and the conducting direction is from the second cavity (458) to the first cavity (457); the conducting direction of the second one-way valve (454) is from the first cavity (457) to the second cavity (458).

4. The coaxial cable of claim 3, wherein: The one-way communication pipe (453) has an air path channel communicating the first cavity (457) and the second cavity (458); a first one-way valve (4532) is arranged at the opening close to the second cavity (458) in the air path channel, and the first one-way valve (4532) is used for allowing air to flow from the second cavity (458) to the first cavity (457); The one-way communication pipe (453) is telescopically installed on the second sealing sleeve (452), and a driving spring (4531) is arranged outside the one-way communication pipe (453) to drive the one-way communication pipe (453) to always have a tendency to move towards the second cavity (458) to block the air path channel from the first cavity (457); The second chamber (458) is provided with an abutting plate (456), when the push rod (44) is completely retracted, the abutting plate (456) abuts against the one-way communication pipe (453) and drives the one-way communication pipe (453) to move towards the first chamber (457) to communicate the air path with the first chamber (457).

5. The coaxial cable of claim 4, wherein: The first sealing sleeve (451) is fixedly connected to the outer side of the lead screw (42), and the first sealing sleeve (451) is in sealing abutment with the inner wall of the push rod (44) and slides relative to the push rod (44); the lower end of the lead screw (42) is connected with a second threaded section (422), the threaded direction of the second threaded section (422) is opposite to that of the first threaded section (421); the second sealing sleeve (452) is threadedly connected to the second threaded section (422); the second sealing sleeve (452) and the inner wall of the push rod (44) are provided with a second limiting structure for limiting the circumferential rotation of the second sealing sleeve (452) to realize the relative sliding of the second sealing sleeve (452) and the push rod (44); the second sealing sleeve (452) and the inner wall of the push rod (44) and the lead screw (42) are all sealingly arranged; The abutting plate (456) is fixedly connected to the end of the lead screw (42).

6. The coaxial cable of claim 4, wherein: The first sealing sleeve (451) is fixedly connected to the inner wall of the push rod (44), and the first sealing sleeve (451) is in sealing abutment with the lead screw (42) and slides relative to the lead screw (42); the second sealing sleeve (452) is fixedly sleeved on the outer side of the lead screw (42), and the second sealing sleeve (452) is in sealing abutment with the inner wall of the push rod (44) and slides relative to the push rod (44); The abutting plate (456) is fixedly connected to the inner wall of the push rod (44).

7. The coaxial cable of claim 3, wherein: The dust collecting structure (46) comprises a dust removing scraping ring (461) arranged at the end of the actuator housing (41) and a dust collecting filter cylinder (463) for filtering air and collecting dust; the dust collecting filter cylinder (463) is arranged in the second chamber (458) and connected with the dust collecting connector (47); The dust removing scraping ring (461) is sealingly arranged with the outer wall of the push rod (44) and forms a dust collecting ring groove (462) therebetween; the side wall through hole is circumferentially spaced apart and arranged on the outer side of the end of the push rod (44), and when the push rod (44) is completely retracted, the dust collecting ring groove (462) is opposite to the side wall through hole; The second chamber (458) has a blocking plate (464) for inserting the dust collecting filter cylinder (463) to drive air to pass through only the dust collecting filter cylinder (463).

8. The coaxial cable of claim 7, wherein: The side wall through hole is provided with a third one-way valve (455) for unidirectionally entering air and dust from the outside into the second chamber (458); the dust collecting connector (47) has a fourth one-way valve (471) for unidirectionally discharging air in the second chamber (458) to the outside.

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