A rack pin lock assembly

Abstract

The present application belongs to the technical field of machining device, and particularly relates to a rack pin locking assembly, which comprises a rotating shaft, the end of the rotating shaft is provided with a toothed part engaged with a rack pin; a limiting structure is used for limiting and releasing the rotating movement of the rotating shaft; when the rotating shaft is acted on by the limiting structure, the rotating shaft cannot rotate under the driving of external force, and the rack pin is in a locking state; when the rotating shaft is separated from the action of the limiting structure, the rotating shaft rotates under the driving of external force, and the rack pin moves axially under the action of the toothed part, once the rack pin is locked at high and low dwell points by the locking assembly, the rack pin will not escape from the original state even if it is subjected to reverse force, and the rack pin can be lifted only after the outer end shaft is manually pulled out to separate the limiting groove from the limiting pin, so that the rack pin can be rotated.

Description

Technical Field

[0001] This invention belongs to the field of machining equipment technology, and specifically relates to a rack and pinion locking assembly. Background Technology

[0002] In existing mechanical workpiece machining, spring-type rack and pin positioning is commonly used to ensure machining quality and accuracy. However, the reliability of the rack and pin's position at the highest and lowest points is achieved by the spring force.

[0003] like Figure 3 As shown, the rack and pin structure contains a spring. Once the spring fails or the elastic force decreases, the rack and pin at the high point will be dislodged from the product positioning hole due to mechanical vibration during product processing, resulting in inaccurate positioning and product scrap.

[0004] In addition, when the spring force is too large, the lowest point of the rack pin may not completely detach from the pin when the product is lifted after processing, resulting in the scrapping of the processed workpiece.

[0005] Therefore, it is necessary to lock the rack pin's dwell point to eliminate the influence of mechanical vibration and other factors on the traditional rack pin structure, and to avoid the rack pin from coming out of the positioning hole or not completely disengaging under different dwell point conditions. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A rack and pin locking assembly includes a rotating shaft, the end of which is provided with a toothed member that meshes with a rack and pin.

[0008] A limiting structure is used to restrict and release the rotational movement of the rotating shaft;

[0009] When the rotating shaft is acted upon by the limiting structure, the rotating shaft cannot rotate under the drive of external force, and the rack pin is in a locked state;

[0010] When the rotating shaft disengages from the limiting structure, the rotating shaft rotates under the drive of an external force, and the rack pin moves axially under the action of the toothed member.

[0011] Furthermore, the rotating shaft includes an inner shaft and an outer shaft, the limiting structure acts on the outer shaft, and the toothed member is disposed on the side of the inner shaft away from the limiting structure.

[0012] Furthermore, the limiting structure includes a positioning sleeve fitted around the outer circumference of the outer shaft, a limiting groove formed on the peripheral wall of the outer shaft, and a limiting pin with one end extending through the inner wall of the positioning sleeve and cooperating with the limiting groove. Both the inner and outer shafts have cavities, and elastic elements are provided in the cavities. The inner and outer shafts are slidably connected in the axial direction through the elastic elements.

[0013] Further, the inner end shaft and the outer end shaft are connected at the connection part.

[0014] Further, the buckle includes a plurality of slots and a plurality of protrusions, the number of the slots and the number of the protrusions are consistent, and the number is at least one, but considering the stability of the structure, the shaking and the blockage in the movement are avoided, and two is preferred.

[0015] Further, the limiting slot includes a first stop slot, a second stop slot, and an unlocking connecting slot connecting the first stop slot and the second stop slot, the first stop slot, the second stop slot, and the unlocking connecting slot form a U-shaped structure, and the length of the first stop slot and the second stop slot is less than the length of the protrusion inserted into the slot.

[0016] Further, the outer end shaft is provided with a handle, the handle is pulled outward by the operator, the outer end shaft is moved along the axial direction, the limiting pin is separated from the first stop slot, and the limiting pin enters the starting point of the unlocking connecting slot, the restriction of the limiting structure on the rotating shaft is eliminated, the handle is rotated, the inner end shaft and the outer end shaft form a rotating shaft, and the rotating shaft is rotated as a whole.

[0017] Further, the elastic member includes a tension spring.

[0018] Further, the inner end shaft and the outer end shaft are respectively provided with a tension spring pin connected to both ends of the tension spring.

[0019] Further, the locking assembly is installed in the shell.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The locking of the high and low points of the rack pin is realized by the inner end shaft, the outer end shaft, the reset of the tension spring, the limiting slot of the outer end shaft, and the cooperation of the limiting pin.

[0022] Once the high and low points of the rack pin are locked, even if the rack pin is subjected to a reverse force, the rack pin will not be separated from the original state, and the outer end shaft must be pulled out manually to separate the limiting slot from the limiting pin, so that the rack pin can be rotated and lifted.

[0023] The reliability of the rack pin positioning and the rack pin exit is ensured, and the product is not scrapped due to the failure of the internal structure of the rack pin.

[0024] The locking effect can reduce the time and processing loss caused by manual misoperation, and eliminate the product scrap loss caused by unreliable rack pin positioning. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1A perspective view of an embodiment of the present application;

[0026] Figure 2 A front view of an embodiment of the present application;

[0027] Figure 3 A perspective view of an embodiment of the present application; Figure 2 A sectional view of an embodiment of the present application;

[0028] Figure 4 A perspective view of an embodiment of the present application;

[0029] Figure 5 A perspective view of an embodiment of the present application;

[0030] Figure 6 A sectional view of an embodiment of the present application;

[0031] Figure 7 A perspective view of an embodiment of the present application;

[0032] Figure 8 A perspective view of an embodiment of the present application;

[0033] The reference signs in the drawings of the specification include:

[0034] Rotating shaft 1, inner end shaft 10, toothed member 100, limiting ring 101, outer end shaft 11, cavity 12, elastic member 13, tension spring pin 14, insertion slot 15, protrusion 16, handle 17, positioning sleeve 20, bolt 200, limiting pin 21, limiting slot 22, stop one slot 221, stop two slot 222, unlocking connecting slot 223, shell 3, rack pin 4, spring 40. DETAILED DESCRIPTION

[0035] In order for those skilled in the art to better understand the present application, the technical solutions of the present application are further described below in conjunction with the drawings and embodiments.

[0036] The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual physical objects. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0037] Example:

[0038] like Figures 1-8 As shown, the locking assembly and rack pin are placed inside the housing 3, which is specifically a clamp base. The pin locking assembly of the present invention includes a rotating shaft 1, the end of which is provided with a toothed member 100 that meshes with the rack pin 4. The rotational movement of the rotating shaft 1 is restricted and released by the limiting structure.

[0039] When the rotating shaft 1 is acted upon by the limiting structure, the rotating shaft 1 cannot rotate under the drive of external force, and the rack pin 4 is in a locked state. When the rotating shaft 1 is released from the action of the limiting structure, the rotating shaft 1 rotates under the drive of external force, and the rack pin 4 moves axially under the action of the toothed part 100.

[0040] The rotating shaft 1 includes an inner shaft 10 and an outer shaft 11. A limiting structure acts on the outer shaft 11. A toothed member 100 is disposed on the side of the inner shaft 10 away from the limiting structure. The toothed member 100 is a gear shaft. The gear shaft and the inner shaft 10 together form an inner gear shaft.

[0041] Specifically, such as Figure 4 As shown, the limiting structure includes a positioning sleeve 20 sleeved on the outer periphery of the outer end shaft 11, a limiting groove 22 opened on the peripheral wall of the outer end shaft 11, and a limiting pin 21 with one end extending through the inner wall of the positioning sleeve 20 and cooperating with the limiting groove 22. Specifically, the limiting pin 21 is threadedly connected to the positioning sleeve 20, and the positioning sleeve 20 is fixedly connected to the housing 3 using bolts 200.

[0042] like Figure 7As shown, the limiting groove 22 includes a stop one groove 221 and a stop two groove 222 extending in the axial direction and symmetrically arranged, and an unlocking connecting groove 223 connecting the stop one groove 221 and the stop two groove 222, the stop one groove 221, the stop two groove 222 and the unlocking connecting groove 223 form a U-shaped structure, wherein the unlocking connecting groove 223 is perpendicular to the stop one groove 221 and the stop two groove 222 when arranged, and the unlocking connecting groove 223 has a certain opening length.

[0043] As shown in the drawings, Figure 5 , Figure 7 , Figure 8 As shown, the inner end shaft 10 and the outer end shaft 11 are provided with a clasp at the connection position, the design points of the clasp are that on the one hand, the inner end shaft 10 and the outer end shaft 11 can slide relative to each other, so that the outer end shaft 11 can slide in the limiting groove 22 to provide matching conditions for the limiting pin 21 before and after the axial movement, on the other hand, the integrity of the rotating shaft 1 is considered, and the rotating shaft 1 is not separated into two parts before and after the relative sliding, so as not to form two independent parts of the inner end shaft 10 and the outer end shaft 11, which will cause the inner end shaft 10 to be unable to rotate with the outer end shaft 11, specifically, the clasp can adopt the form of the insertion groove 15 and the protrusion 16, so that the inner end shaft 10 and the outer end shaft 11 can maintain the integrity while the length of the entire rotating shaft 1 can be lengthened or shortened, and the clasp can also adopt other similar structures to achieve the same effect.

[0044] Specifically, the insertion groove 15 can be arranged on the outer end shaft 11, and the protrusion 16 can be arranged at the end of the outer end shaft 11, the number of the insertion groove 15 and the protrusion 16 is consistent, and the number is at least one, but considering the stability of the structure, to avoid shaking and jamming during movement, two is preferred, of course, the insertion groove 15 can also be arranged on the inner end shaft 10, and the corresponding protrusion 16 can be arranged on the outer end shaft 11, and the specific arrangement is not limited.

[0045] It should be noted that the length of the stop one groove 221 and the stop two groove 222 is less than the length of the protrusion 16 inserted into the insertion groove 15, so that even after the outer end shaft 11 is stretched by the handle 17, the limiting pin 21 slides to the end of the stop one groove 221 or the stop two groove 222, and the outer end shaft 11 moves the maximum distance in the axial direction, the insertion groove 15 and the protrusion 16 are still in the matching state, and the outer end shaft 11 and the inner end shaft 10 will not be separated;

[0046] In addition, it should be noted that the overlapping length of the clasp and the opening length of the stop one groove 221 and the stop two groove 222 are related, if the stop one groove 221 and the stop two groove 222 are arranged too long, the elongation of the elastic member 13 will be increased when the outer end shaft 11 is pulled out, and then during the resetting process of the outer end shaft 11 after the hand is released, a larger impact force will be generated at the clasp, which is not conducive to the service life of the rotating shaft 1.

[0047] When the outer shaft 11 is restrained under the cooperation of the stop groove 221 and the limit pin 21, the rack pin 4 is at the highest stroke dwell point. This state is set as the initial state. In specific operation, the end of the outer shaft 11 is provided with a handle 17. The operator pulls the handle 17 outward by hand to realize the axial movement of the outer shaft 11, so that the limit pin 21 is disengaged from the stop groove 221, and the restraint of the limit structure on the rotating shaft 1 is eliminated. At the same time, the rotating shaft 1 formed by the inner shaft 10 and the outer shaft 11 can be rotated by rotating the handle 17. Under the meshing of the rack pin 4 and the toothed part 100, the rack pin 4 can move up and down and change its stroke.

[0048] During the aforementioned rack driving process, the limiting pin 21 is located in the unlocking groove 223. The length of the unlocking groove 223 is the range of rotation angle that the handle 17 can drive the rotating shaft 1 to rotate, which is also the range of movable stroke of the rack pin 4.

[0049] In addition, such as Figure 8 As shown, a limiting ring 101 is provided on the side of the positioning sleeve 20. The limiting ring 101 is sleeved on the outer periphery of the connection between the inner end shaft 10 and the toothed member 100. The limiting ring 101 is stepped. Since the positioning sleeve 20 is fixed, the inner end shaft 10 will not move axially when the elastic member 13 generates a restoring tension. That is, the inner end shaft 10 can only rotate in place, thus ensuring that the inner end shaft 10 and the rack pin 4 are always in a meshing state.

[0050] like Figure 6 , Figure 7 , Figure 8 As shown, both the inner shaft 10 and the outer shaft 11 have cavities 12, and elastic elements 13 are provided in the cavities 12. The inner shaft 10 and the outer shaft 11 are slidably connected in the axial direction through the elastic elements 13. When the outer shaft 11 is stretched by the handle 17, the elastic element 13 is forced to stretch and extend from its natural state. At this time, the tension on the handle 17 can be removed, and only the handle 17 can be rotated. The elastic element 13 maintains its length. The elastic element 13 can be a tension spring. The inner shaft 10 and the outer shaft 11 are each provided with tension spring pins 14 that are connected to the two ends of the tension spring.

[0051] When rotated to the end of the unlocking groove 223, driven by the elastic element 13, the outer end shaft 11 is forced to move in the opposite direction along the axial direction to the initial position. At this time, the gap between the outer end shaft 11 and the inner end shaft 10 becomes smaller. At the same time, the stop groove 222 cooperates with the limit pin 21. If the rotational force is continued to be applied to the outer end shaft 11, the outer end shaft 11 cannot rotate, thus locking the entire rotating shaft 1. At this time, the rack pin 4 is also locked at the lowest stroke dwell point.

[0052] The rack pin 4 will not be removed from the original state even if it is subjected to a reverse force after being locked at the high and low dwell points. The outer end shaft 11 must be pulled out so that the limiting groove 22 is separated from the limiting pin 21, and then the rack pin 4 can be rotated to be raised or lowered.

[0053] The above embodiment is the case where the highest stroke dwell point of the rack pin 4 corresponds to the cooperation of the limiting pin 21 and the stop groove 221. The limiting pin 21 and the stop groove 221 can also be cooperated when the lowest stroke dwell point of the rack pin 4. The position of the toothed piece 100 engaged on the left side or the right side of the rack pin 4 can be adjusted as needed.

[0054] In addition, since the rack pin 4 uses the locking assembly of the present application, the adverse effects of the existing spring 40 type rack pin 4 are eliminated, and the harm caused by the failure of the spring 40 is prevented. With the common use of the locking assembly, the spring 40 at the bottom of the rack pin 4 can also be removed, and the stroke of the rack pin 4 is directly controlled by the locking assembly.

[0055] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme known in the art are not described in detail. The ordinary skilled person in the art knows all the ordinary technical knowledge in the field of the present application before the filing date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date. The ordinary skilled person in the art can improve and implement the present scheme based on their own ability under the guidance of the present application. Some typical known structures or known methods should not be an obstacle for the ordinary skilled person in the art to implement the present application. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be considered as the protection scope of the present application. These will not affect the effect and practicality of the present application.

Claims

1. A rack and pin locking assembly, characterized in that, include: A rotating shaft, the end of which is provided with a toothed part that meshes with a rack pin; A limiting structure is used to restrict and release the rotational movement of the rotating shaft; When the rotating shaft is acted upon by the limiting structure, the rotating shaft cannot rotate under the drive of external force, and the rack pin is in a locked state; When the rotating shaft disengages from the limiting structure, the rotating shaft rotates under the drive of an external force, and the rack pin moves axially under the action of the toothed member; The rotating shaft includes an inner shaft and an outer shaft, the limiting structure acts on the outer shaft, and the toothed member is disposed on the side of the inner shaft away from the limiting structure; The limiting structure includes a positioning sleeve fitted on the outer circumference of the outer end shaft, a limiting groove formed on the peripheral wall of the outer end shaft, and a limiting pin with one end extending through the inner wall of the positioning sleeve and cooperating with the limiting groove. Both the inner end shaft and the outer end shaft have cavities, and elastic elements are provided in the cavities. The inner end shaft and the outer end shaft are slidably connected in the axial direction through the elastic elements, and the elastic elements include tension springs. A fastening element is provided at the connection between the inner and outer end shafts; The fastening element includes a slot and a protrusion; The limiting groove includes a first stopping groove and a second stopping groove that extend axially and are symmetrically arranged, and an unlocking groove that connects the first stopping groove and the second stopping groove. The first stopping groove, the second stopping groove, and the unlocking groove form a U-shape.

2. The rack and pin locking assembly as described in claim 1, characterized in that: A handle is provided at the end of the outer shaft.

3. A rack and pin locking assembly as described in claim 2, characterized in that: Each of the inner and outer shafts is provided with a tension spring pin that connects to both ends of the tension spring.

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