Push rod actuator with self-locking device
Patent Information
- Application Number
- CN202521863779.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-01
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-09-01
AI Technical Summary
推杆执行器在应用到家电行业时，其中齿条推出之后需要保持一段时间，有些会采用施加保持力的方式，将力直接施加在齿条上，且现有的推杆执行器大多是通过马达与减速齿轮箱配合输出，这种操作方式较为繁琐，且对马达和减速齿轮箱的要求较高，提高了生产制造成本
[0012]上述技术方案可以看出，本实用新型具有如下有益效果：本实用新型所述的一种带自锁装置的推杆执行器，单向锁扣与解锁斜块配合，使得齿条伸出后能够保持，再通过电机反转收回齿条，通过物理结构进行自锁，结构简单，使用方便，且降低成本，方便生产，在使用时齿条伸出到微动开关滚轮进入第一缺口处停止，此时两侧的单向锁扣与解锁斜块配合，齿条的进退均会收到阻力，形成自锁，电机继续驱动齿条向外伸出，提供的力大于单向锁扣斜边提供的阻力，单向锁扣向内弯曲，解锁斜块越过单向锁扣，使得微动开关进入第二缺口位置，此时为齿条收缩前准备工作；齿条收回时电机发生反转，带动齿条回缩，解锁斜块与单向锁扣的直角边接触，单向锁扣顺着解锁斜块斜边滑动压缩，且解锁斜块受力压缩复位弹簧，使得解锁斜块贴紧齿条，直到齿条通过单向锁扣，复位弹簧回弹，解锁斜块复位，回到初始状态。
Smart Images
Figure CN224834761U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of push rod actuator technology, and specifically to a push rod actuator with a self-locking device. Background Technology
[0002] Currently, high-end home appliances are developing towards intelligence, centralization, cabinet-style design, and integration. With the application of various automatic door opening and closing actuators, door handles are gradually being phased out, making appliances more aesthetically pleasing. When push rod actuators are applied to the home appliance industry, the rack needs to be held for a period of time after being extended. Some use a holding force method, applying the force directly to the rack. Furthermore, most existing push rod actuators output power through a motor and reduction gearbox, a relatively cumbersome operation method that places high demands on the motor and reduction gearbox, increasing manufacturing costs. Utility Model Content
[0003] The purpose of this utility model is to provide a push rod actuator with a self-locking device to solve the above problems. It uses a self-locking structure to limit the rack, which is simple in structure and low in cost.
[0004] Technical Solution: This utility model provides a push rod actuator with a self-locking device, comprising: a housing, a motor, a rack, an unlocking wedge, and a one-way latch. The housing is L-shaped and includes two vertically connected parts: a motor mounting area and a rack extension area. The motor is located in the motor mounting area, and its output end is connected to a drive rod. The rack is located within the rack extension area, with its outer end extending out of the housing. The rack has teeth that engage with the drive rod. A first notch and a second notch are provided on one side of the rack, and the housing also has a micro switch that engages with the first and second notches. The unlocking wedge is located at the inner end of the rack, and an elastic reset mechanism is provided between the unlocking wedge and the rack. There are two one-way latches, symmetrically arranged on both sides of the inner end of the rack extension area, which engage with the unlocking wedge to form a self-locking limit when the rack extends.
[0005] Furthermore, in the aforementioned push rod actuator with a self-locking device, the housing includes an upper shell and a lower shell, the upper shell having an upwardly protruding cavity, which is a contoured cavity for installing internal components.
[0006] Furthermore, in the aforementioned push rod actuator with a self-locking device, the upper and lower shells have openings in the right-angled portion of the rack movement direction for the rack to pass through.
[0007] Furthermore, in the aforementioned push rod actuator with a self-locking device, guide rollers are provided on both sides inside the opening.
[0008] Furthermore, in the aforementioned push rod actuator with a self-locking device, the micro switches are symmetrically arranged on both sides of the drive rod, and rollers are provided on the micro switches, with the rollers attached to the side wall of the rack.
[0009] Furthermore, in the aforementioned push rod actuator with a self-locking device, the unlocking wedge is an isosceles trapezoidal structure with its base corresponding to the rack and its width being equal to the width of the rack. A through hole is provided in the middle of the unlocking wedge.
[0010] Furthermore, in the aforementioned push rod actuator with a self-locking device, the elastic reset mechanism includes a guide limit rod and a reset spring. The guide limit rod passes through the middle through hole of the unlocking inclined block and is connected to the rack. A limit cap with a diameter larger than the inner diameter of the through hole is provided on the upper bottom of the guide limit rod. The reset spring is sleeved on the outside of the guide limit rod and uses elasticity to hold the unlocking inclined block in place.
[0011] Furthermore, in the aforementioned push rod actuator with a self-locking device, the outer side of the one-way latch is an elastic bending part, and the inner side is a latching part. The latching part has a right-angled triangular structure, with the right-angled side corresponding to the hypotenuse of the unlocking block. When the latching part is subjected to force, the elastic bending part bends inward.
[0012] As can be seen from the above technical solution, this utility model has the following beneficial effects: The push rod actuator with a self-locking device described in this utility model uses a one-way locking buckle and an unlocking wedge to keep the rack extended. The rack is then retracted by the motor in reverse, achieving self-locking through a physical structure. This design is simple, easy to use, reduces costs, and facilitates production. During use, the rack extends until the microswitch roller enters the first notch and stops. At this point, the one-way locking buckles on both sides engage with the unlocking wedge, and the rack's forward and backward movement is resisted, forming a self-lock. The motor continues to drive the rack... When the rack extends outward, the force it provides exceeds the resistance provided by the inclined side of the one-way latch. The one-way latch bends inward, and the unlocking block passes over the one-way latch, causing the micro switch to enter the second notch position. This is preparation for the rack to retract. When the rack retracts, the motor reverses, causing the rack to retract. The unlocking block contacts the right-angled side of the one-way latch, and the one-way latch slides and compresses along the inclined side of the unlocking block. The unlocking block is also compressed by the force of the return spring, causing the unlocking block to press against the rack until the rack passes the one-way latch. The return spring then springs back, and the unlocking block returns to its initial state. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of a push rod actuator with a self-locking device according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the novel push rod actuator. Figure 3 This is a schematic diagram of the unlocking ramp of this utility model; Figure 4This is a schematic diagram of the one-way locking mechanism of this utility model.
[0014] In the diagram: 1. Housing; 2. Motor; 3. Rack; 4. Unlocking wedge; 5. One-way latch; 11. Motor mounting area; 12. Rack telescopic area; 13. Micro switch; 14. Upper housing; 15. Lower housing; 16. Opening; 17. Guide roller; 21. Drive rod; 31. Tooth pattern; 32. First notch; 33. Second notch; 41. Elastic reset mechanism; 411. Guide limit rod; 412. Reset spring; 51. Elastic bending part; 52. Latch part. Detailed Implementation
[0015] Example 1 like Figure 1-4 The push rod actuator with a self-locking device shown includes: a housing 1, a motor 2, a rack 3, an unlocking wedge 4, and a one-way latch 5. The housing 1 is L-shaped and includes two vertically connected parts, namely a motor mounting area 11 and a rack extension area 12. The motor 2 is located in the motor mounting area 11, and the output end of the motor 2 is connected to a drive rod 21. The rack 3 is located in the rack extension area 12, and its outer end extends out of the housing 1. The rack 3 has teeth 31, which are connected to the drive rod 21. A first notch 32 and a second notch 33 are provided on one side of the rack 3, and the housing 1 is also provided with a micro switch 13 that cooperates with the first notch 32 and the second notch 33. The unlocking wedge 4 is located at the inner end of the rack 3, and an elastic reset mechanism 41 is provided between the unlocking wedge 4 and the rack 3. There are two one-way latches 5, which are symmetrically arranged on both sides of the inner end of the rack extension area 12, and cooperate with the unlocking wedge 4 to form a limiting self-lock when the rack 3 extends. When in use, the rack 3 extends until the roller of the micro switch 13 enters the first notch 32 and stops. At this time, the one-way latches 5 on both sides cooperate with the unlocking wedge 4, and the rack 3 will receive resistance when moving forward or backward, thus forming a self-locking mechanism.
[0016] like Figure 1 The illustrated push rod actuator with a self-locking device includes a housing 1 comprising an upper housing 14 and a lower housing 15. The upper housing 14 has an upwardly protruding cavity, which is a contoured cavity for installing internal components. This facilitates installation and improves space utilization.
[0017] In this embodiment, the upper shell 14 and the lower shell 15 are provided with openings 16 in the direction of movement of the rack 3 at the right angle, so that the rack 3 can pass through; guide rollers 17 are provided on both sides inside the opening 16 to maintain the stability of the rack 3 during the extension and retraction process.
[0018] Example 2 Based on Example 1, in this example, as... Figure 2The push rod actuator shown has a self-locking device. The micro switches 13 are symmetrically arranged on both sides of the drive rod 21. The micro switches 13 are equipped with rollers. The rollers are attached to the side wall of the rack 3, which can also maintain the stability of the rack 3 during the extension and retraction process.
[0019] like Figure 3 The illustrated push rod actuator with a self-locking device has an isosceles trapezoidal structure for the unlocking ramp 4, with its base corresponding to the rack 3 and its width equal to that of the rack 3. The unlocking ramp 4 has a through hole in the middle. The elastic reset mechanism 41 includes a guide limit rod 411 and a reset spring 412. The guide limit rod 411 passes through the through hole in the middle of the unlocking ramp 4 and is connected to the rack 3. A limit cap with a diameter larger than the inner diameter of the through hole is provided on the outer side of the guide limit rod 411. The reset spring 412 is sleeved on the outer side of the guide limit rod 411 and uses elasticity to hold the unlocking ramp 4 in place.
[0020] like Figure 4 The push rod actuator with a self-locking device shown has an outer elastic bending part 51 and an inner locking part 52 on the one-way latch 5. The locking part 52 has a right-angled triangular structure, with the right-angled side corresponding to the hypotenuse of the unlocking wedge 4. When the locking part 52 is subjected to force, the elastic bending part 51 bends inward. When the push rod actuator resets, the motor 2 continues to drive the rack 3 to extend outward, providing a force greater than the resistance provided by the inclined side of the one-way latch 5. The one-way latch 5 bends inward, and the unlocking block 4 passes over the one-way latch 5, causing the micro switch 13 to enter the second notch 33 position. This is preparation work before the rack 3 retracts. When the rack 3 retracts, the motor 2 reverses, causing the rack 3 to retract. The unlocking block 4 contacts the right-angle side of the one-way latch 5, and the one-way latch 5 slides and compresses along the inclined side of the unlocking block 4. The unlocking block 4 is also compressed by the force of the return spring 412, causing the unlocking block 4 to press against the rack 3 until the rack 3 passes through the one-way latch 5. The return spring 412 rebounds, the unlocking block 4 resets, and the push rod actuator returns to its initial state.
[0021] It should be noted that the above description is merely a technical solution of the utility model and not a limitation. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the utility model without departing from the scope of the present utility model, and all such modifications and substitutions should be covered within the scope of the claims of the present utility model.
Claims
1. A push rod actuator with a self-locking device, characterized in that: include: The housing (1) is L-shaped and includes two vertically connected parts, namely the motor mounting area (11) and the rack telescopic area (12); Motor (2), the motor (2) is installed in the motor mounting area (11), and the output end of the motor (2) is connected to the drive rod (21); A rack (3) is provided in the rack extension area (12), with its outer end extending out of the housing (1). The rack (3) has teeth (31) that are connected to the drive rod (21). A first notch (32) and a second notch (33) are provided on one side of the rack (3), and the housing (1) is also provided with a micro switch (13) that cooperates with the first notch (32) and the second notch (33). Unlocking wedge (4), the unlocking wedge (4) is disposed at the inner end of the rack (3), and an elastic reset mechanism (41) is provided between the unlocking wedge (4) and the rack (3); One-way latch (5), there are two one-way latches (5), which are symmetrically arranged on both sides of the inner end of the rack telescopic area (12), and cooperate with the unlocking wedge (4) to form a limiting self-lock when the rack (3) extends.
2. The push rod actuator with a self-locking device according to claim 1, characterized in that: The housing (1) includes an upper shell (14) and a lower shell (15). The upper shell (14) has an upwardly protruding cavity, which is a contoured cavity for installing internal components.
3. A push rod actuator with a self-locking device according to claim 2, characterized in that: The upper shell (14) and lower shell (15) have openings (16) in the direction of movement of the rack (3) at the right angle, through which the rack (3) passes.
4. A push rod actuator with a self-locking device according to claim 3, characterized in that: Guide rollers (17) are provided on both sides inside the opening (16).
5. A push rod actuator with a self-locking device according to claim 1, characterized in that: The micro switch (13) is symmetrically arranged on both sides of the drive rod (21). The micro switch (13) is equipped with a roller, which is attached to the side wall of the rack (3).
6. A push rod actuator with a self-locking device according to claim 1, characterized in that: The unlocking wedge (4) is an isosceles trapezoidal structure with its bottom edge corresponding to the rack (3) and its width being equal to that of the rack (3). The unlocking wedge (4) has a through hole in the middle.
7. A push rod actuator with a self-locking device according to claim 1, characterized in that: The elastic reset mechanism (41) includes a guide limit rod (411) and a reset spring (412). The guide limit rod (411) passes through the middle through hole of the unlocking inclined block (4) and is connected to the rack (3). The guide limit rod (411) has a limit cap on the bottom outside of the unlocking inclined block (4), with a diameter larger than the inner diameter of the through hole. The reset spring (412) is sleeved on the outside of the guide limit rod (411) and uses elasticity to press against the unlocking inclined block (4).
8. A push rod actuator with a self-locking device according to claim 1, characterized in that: The outer side of the one-way latch (5) is an elastic bending part (51), and the inner side is a latch part (52). The latch part (52) is a right-angled triangle structure, with the right-angled side corresponding to the hypotenuse of the unlocking block (4). When the latch part (52) is subjected to force, the elastic bending part (51) bends inward.