A clamping tool for a bar

Abstract

The utility model relates to the technical field of clamping tool of bar, specifically relates to a kind of clamping tool for bar. Including base, first clamping part, second clamping part and movable clamping part, first clamping part coaxially is arranged at the outside of second clamping part, and can slide along the axial direction, and the locking and fixing of both is realized through connecting block and clamping groove, movable clamping part and base sliding fit, in the process of pushing, make connecting block disengage from clamping groove by trigger lever effect, to release locking state, make first clamping part exit clamping work surface. The utility model can realize the automatic switching of clamping range, especially improve the clamping stability of the bar of which diameter is less than set diameter.

Description

Technical Field

[0001] This utility model relates to the field of clamping fixtures for bars, and specifically to a clamping fixture for bars. Background Technology

[0002] Stable clamping of bar stock is a key step in ensuring machining accuracy and improving production efficiency. Currently, most common bar stock clamping structures use fixed V-shaped positioning blocks, which achieve clamping and positioning of the bar stock through the coordinated action of two oppositely positioned clamping surfaces.

[0003] However, these traditional clamps have certain limitations in practical applications. Their clamping range is usually limited by the structural dimensions, and when clamping small-diameter bars, problems such as insufficient clamping force, misalignment, or workpiece damage are prone to occur, thus affecting machining quality and operational safety.

[0004] Therefore, there is an urgent need to provide a clamping fixture with a reasonable structural design, convenient operation, adaptive adjustment of the clamping range, and good clamping stability, so as to effectively solve the problems of limited clamping range, inconvenient adjustment, and poor clamping stability in the existing technology. Utility Model Content

[0005] The purpose of this utility model is to provide a clamping fixture for bars, so as to solve the problems mentioned in the background art, such as the limited clamping range of the clamps and the tendency to have insufficient clamping force when clamping small-diameter bars.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A clamping fixture for bars includes a base and a movable clamping part. The base has a first clamping part and a second clamping part, which together form a clamping working surface. The first clamping part is coaxially disposed outside the second clamping part and slidably connected to the second clamping part, so that the first clamping part can move axially relative to the second clamping part. The movable clamping part is slidably engaged with the base so that it faces and abuts against the first clamping part axially. When the movable clamping part abuts against the first clamping part, it can push the first clamping part away from the second clamping part axially, so that the clamping working surface is formed only by the second clamping part, to accommodate bars with a diameter smaller than a set diameter.

[0007] Furthermore, the second clamping part is provided with a connecting block, which slides in conjunction with the first clamping part; the first clamping part is provided with a snap-fit ​​groove, and the connecting block is at least partially slidably embedded in the snap-fit ​​groove to achieve locking and fixing between the first clamping part and the second clamping part; the movable clamping part is provided with a trigger rod; wherein, when the movable clamping part moves axially toward the first clamping part, the trigger rod can abut against the connecting block, causing the connecting block to disengage from the snap-fit ​​groove, thereby releasing the locking state between the first clamping part and the second clamping part.

[0008] Furthermore, the snap-fit ​​groove includes a first segment extending axially and a second segment extending in the width direction, the first segment being used to embed the connecting block; wherein, when the connecting block is dislodged from the first segment, the connecting block can enter the second segment and slide along its axial direction.

[0009] Furthermore, the second segment is provided with a guide post, which is arranged along the axial direction of the second segment. The guide post is elastically connected to the connecting block so that the connecting block can be embedded in the first segment after sliding along the second segment.

[0010] Furthermore, the movable clamping part is provided with a receiving groove, and the trigger rod is slidably received in the receiving groove.

[0011] Furthermore, the first clamping part is provided with a guide groove for guiding the trigger rod. The guide groove is parallel to the second segment and directly opposite the receiving groove. The guide groove is connected to the first segment.

[0012] Furthermore, the trigger rod has a movable end, and the base has a stop block. When the movable clamping part abuts against the first clamping part, the movable end abuts against the stop block, so that the trigger rod extends out of the receiving groove.

[0013] The advantages of the clamping fixture for bars described in this utility model compared to the prior art are as follows: By setting a first clamping part and a second clamping part on the base, and coaxially positioning the first clamping part on the outside of the second clamping part, with a sliding connection between them, a clamping working surface that can automatically adjust according to changes in the diameter of the bar is formed. The movable clamping part slides with the base and can axially face and abut against the first clamping part. When the movable clamping part contacts the first clamping part, it pushes the first clamping part axially away from the second clamping part, so that the clamping working surface is solely borne by the second clamping part. This achieves an automatic switching function for the clamping range, effectively adapting to bars of various diameters. It exhibits higher stability and reliability, especially when clamping bars with a diameter smaller than the set diameter, reducing problems such as instability or workpiece eccentricity caused by excessively large clamping areas in traditional fixtures. Attached Figure Description

[0014] Figure 1 This is an axonometric view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is one of the top sectional views of this utility model; Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 This is the second top sectional view of the present invention; Figure 6 for Figure 5 Enlarged view of B in the middle; Figure 7 This is a side sectional view of the first clamping part and the second clamping part; Figure 8 This is a front sectional view of the present invention; Figure 9 for Figure 8 A magnified view of C.

[0015] The attached diagram shows the following markings and corresponding component names: 100-base, 110-stop block, 200-first clamping part, 210-snap slot, 211-first section, 212-second section, 220-guide slot, 300-second clamping part, 310-connecting block, 400-movable clamping part, 410-trigger rod, 411-movable end, 420-receiving slot, 500-guide post. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Example: Reference Figures 1-2 The clamping fixture for bar stock provided in this embodiment includes a base 100 and a plurality of clamping components disposed on the base 100. The base 100 serves as the basic support structure of the entire fixture and is used to support and fix each clamping component.

[0018] A first clamping part 200 and a second clamping part 300 are provided on the base 100. The two are arranged coaxially and together form a clamping working surface for clamping bars, which is used to clamp bars within a certain diameter range. The first clamping part 200 is located on the outside and is installed on the second clamping part 300 by sliding fit, so that it can move axially relative to the second clamping part 300, thereby realizing the adjustment of the clamping working surface.

[0019] Specifically, the first clamping part 200 can be configured as two, which are symmetrically arranged on the upper and lower sides of the second clamping part 300 along the height direction to enhance the stability and support rigidity during the clamping process. The second clamping part 300 can be fixedly connected to the base 100.

[0020] In addition, an axial threaded through hole can be provided on the movable clamping part 400, and a threaded hole is provided on the base 100 at a corresponding position. After the clamping action is completed, the movable clamping part 400 can be fixed by passing a fastening bolt through the threaded through hole and screwing it into the threaded hole on the base 100, so as to prevent it from shifting during the processing.

[0021] The first clamping part 200 can move axially away from the second clamping part 300, so that the clamping working surface is borne solely by the second clamping part 300, thus accommodating the clamping requirements of bars with a diameter smaller than the set diameter. This structural design not only improves the adaptability of the clamping range, but also effectively reduces problems such as insecure clamping and misalignment that are prone to occur when clamping small workpieces using traditional fixtures.

[0022] In some embodiments, in order to further enhance the stability of the clamping fixture in the working state and prevent the first clamping part 200 from moving unexpectedly relative to the second clamping part 300 during the clamping of the bar, the second clamping part 300 is provided with a connecting block 310, which forms a sliding fit relationship with the first clamping part 200.

[0023] Specifically, a snap-fit ​​groove 210 is provided on the first clamping part 200. This snap-fit ​​groove 210 extends in a specific direction (such as axial direction) to accommodate a portion of the connecting block 310. When the first clamping part 200 is in the locked state, the connecting block 310 is at least partially embedded in the snap-fit ​​groove 210 and tightly fitted against its inner wall, thereby achieving a locking and fixing between the first clamping part 200 and the second clamping part 300. This locking structure can effectively prevent the first clamping part 200 from shifting or sliding due to external forces during clamping, ensuring the stability and reliability of the clamping operation.

[0024] refer to Figures 3-6 It should be noted that, to ensure controllability of the movement of the first clamping part 200, the movable clamping part 400 is equipped with a trigger rod 410. When it is necessary to switch the clamping mode to accommodate bars of different diameters, the movable clamping part 400 is pushed axially toward the first clamping part 200, causing the trigger rod 410 to move synchronously. After the trigger rod 410 comes into contact with the connecting block 310, continuing to apply a pushing force will push the connecting block 310 out of the locking groove 210, releasing the locking state between the two and allowing the first clamping part 200 to slide freely axially.

[0025] It is worth mentioning that, in order to further enhance the stability of the clamping fixture during the clamping process and prevent the first clamping part 200 from undergoing unexpected displacement due to the reaction force of the bar, the snap-fit ​​groove 210 opened on the first clamping part 200 is designed to have a two-section structure, including a first section 211 extending along the axial direction and a second section 212 extending along the width direction.

[0026] The first segment 211 is used to embed the connecting block 310 and form a tight fit with it to achieve locking and fixation between the first clamping part 200 and the second clamping part 300. When the clamping fixture is in the clamping state, the connecting block 310 is embedded in the first segment 211, restricting its degree of freedom, thereby effectively preventing the first clamping part 200 from radial displacement or shaking when subjected to the reaction force applied by the bar, ensuring the stability and reliability of the clamping operation.

[0027] When it is necessary to switch the clamping mode, for example to adapt to a bar with a diameter smaller than the set diameter, the movable clamping part 400 pushes the trigger rod 410 to abut against the connecting block 310, causing it to disengage from the first section 211. At this time, the connecting block 310 can enter the second section 212 and slide along its axial direction, thereby allowing the first clamping part 200 to move relative to the second clamping part 300, completing the adjustment of the clamping working surface.

[0028] The extension direction of the second segment 212 is consistent with the width direction of the clamping part, providing a clear sliding path for the connecting block 310 and preventing it from deviating from the predetermined trajectory during sliding. This segmented snap-fit ​​groove 210 structure not only achieves stable locking in the clamping state, but also ensures the controllability of the movement of the first clamping part 200 after unlocking.

[0029] Through the above design, the tooling can effectively resist the combined axial and radial stress from the bar during the clamping process, significantly improving the clamping rigidity and positioning accuracy. It is especially suitable for the stable clamping of bars with a diameter smaller than the set diameter that require high machining accuracy.

[0030] In this embodiment, to further improve the stability and automation of the clamping fixture during the clamping state switching process, a guide post 500 is provided in the second section 212 of the snap-fit ​​groove 210. The guide post 500 is arranged along the axial direction of the second section 212 and is used to guide the connecting block 310 to slide inside it.

[0031] Specifically, the guide post 500 can be fixedly installed at the bottom of the second segment 212 and form an elastic connection with the connecting block 310. For example, a spring or other elastic element can be installed between the connecting block 310 and the guide post 500 so that after the connecting block 310 is pushed and slid by an external force, it still has the tendency to return along the original path and re-embed into the first segment 211.

[0032] When the movable clamping part 400 pushes the trigger rod 410 to abut against the connecting block 310, causing it to disengage from the first segment 211 and enter the second segment 212, the connecting block 310 will slide along the extension direction of the guide post 500. Due to the presence of the guide post 500, the sliding path of the connecting block 310 is precisely defined, avoiding jamming or failure caused by offset or shaking.

[0033] After the clamping task is completed, if the movable clamping part 400 retracts, the force of the trigger rod 410 on the connecting block 310 disappears. Under the action of the elastic element, the connecting block 310 can automatically reset to the initial position along the guide post 500 and re-embed into the first segment 211, restoring the locking state between the first clamping part 200 and the second clamping part 300.

[0034] This structural design not only improves the ease of operation and response speed of the clamping fixture, but also effectively ensures the reliability of unlocking and resetting actions, making it particularly suitable for automated processing scenarios that require frequent switching of clamping modes.

[0035] refer to Figures 8-9 In some embodiments, to further improve the overall structural compactness of the clamping fixture and the operational stability of the triggering mechanism, the movable clamping part 400 is provided with a receiving groove 420, and the triggering rod 410 is slidably received in the receiving groove 420.

[0036] Specifically, the receiving groove 420 is formed inside the movable clamping part 400, and its extending direction is generally consistent with the direction of the clamping action. The trigger rod 410 is partially or completely embedded in the receiving groove 420 and can slide freely along the axial direction within the groove. This arrangement not only effectively reduces the number of external protruding parts, but also avoids interference between the trigger rod 410 and other structures during movement, thus improving the safety and reliability of the clamping action.

[0037] In this embodiment, in order to further improve the stability of the clamping fixture during the unlocking process, the first clamping part 200 is provided with a guide groove 220, which is used to guide the trigger rod 410 to move along a predetermined path.

[0038] Specifically, the extension direction of the guide groove 220 is parallel to the second segment 212 of the snap-fit ​​groove 210 to ensure that the movement direction of the trigger rod 410 is consistent with the sliding path of the connecting block 310. At the same time, the position of the guide groove 220 is directly opposite to the receiving groove 420 on the movable clamping part 400, so that after the trigger rod 410 extends out of the receiving groove 420, it can smoothly enter the guide groove 220 and advance along its extension direction.

[0039] Furthermore, one end of the guide groove 220 is connected to the first segment 211 of the snap-fit ​​groove 210, providing a continuous movement channel for the trigger rod 410 to push the connecting block 310 away from the first segment 211. When the movable clamping part 400 advances axially and contacts the first clamping part 200, the trigger rod 410 gradually approaches the connecting block 310 under the guidance of the guide groove 220, and finally pushes it out of the first segment 211, completing the unlocking action.

[0040] The guide groove 220 not only enhances the guidance and stability of the trigger rod 410 during movement, but also effectively avoids trigger failure caused by offset or misalignment, thus improving the reliability and repeatability of clamping state switching.

[0041] In some embodiments of this utility model, the set diameter can be predetermined according to actual clamping requirements. For example, when the set diameter is 10mm, the clamping fixture is used to clamp bars with a diameter less than 10mm. In this case, the first clamping part is withdrawn from the clamping working surface, and only the second clamping part constitutes the clamping working surface to provide a stable and reliable clamping force. It is understood that the specific value of the set diameter is not limited to this and can be flexibly adjusted according to factors such as the bar material and processing accuracy requirements.

[0042] It is worth noting that one end of the trigger rod 410 is designed as a movable end 411, which can be displaced within a certain range. A stop block 110 is provided at a corresponding position on the base 100 to cooperate with the movable end 411 of the trigger rod 410.

[0043] When the movable clamping part 400 moves axially and abuts against the first clamping part 200, the entire structure begins to enter the unlocking preparation state. At this time, the movable end 411 contacts the stop block 110 and is limited, preventing it from continuing to advance with the movable clamping part 400. As the receiving groove 420 moves synchronously with the movable clamping part 400, and the movable end 411 is blocked by the stop block 110, the trigger rod 410 slides forward relative to the receiving groove 420 and gradually extends.

[0044] This relative motion allows the trigger rod 410 to accurately enter the guide groove 220 and push the connecting block 310 to disengage from the first section 211 of the snap-fit ​​groove 210, thereby releasing the locking state between the first clamping part 200 and the second clamping part 300.

[0045] Through the above structural design, the extension action of the trigger rod 410 is achieved through mechanical linkage control. It will only be triggered after the movable clamping part 400 reaches the designated position, thus avoiding malfunctions and improving the stability and reliability of the clamping fixture during the clamping mode switching process.

[0046] Working principle: When clamping large-diameter bars, the movable clamping part 400 is positioned away from the first clamping part 200. At this time, the first clamping part 200 and the second clamping part 300 together form the clamping working surface. The connecting block 310 is embedded in the first section 211 of the snap-fit ​​groove 210, so that the first clamping part 200 and the second clamping part 300 are locked together, ensuring structural stability during clamping and preventing the clamping part from shifting due to external forces.

[0047] When it is necessary to clamp a bar with a diameter smaller than the set diameter, the movable clamping part 400 moves axially toward the first clamping part 200 and eventually contacts it. As the pushing action continues, the trigger rod 410 extends forward relative to the receiving groove 420 under the action of the stop block 110, enters the guide groove 220, and pushes the connecting block 310 out of the first section 211, thereby releasing the locking state between the first clamping part 200 and the second clamping part 300. At this time, the first clamping part 200 can move axially outward under the action of external thrust, exiting the clamping working surface, and only the second clamping part 300 alone completes the clamping task of the small-diameter bar.

[0048] The various illustrative embodiments mentioned in this specification refer to specific structures described in connection with those embodiments that are included in at least one embodiment of the general description in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a structure is described in connection with any embodiment, it is intended that implementing such a structure in conjunction with other embodiments falls within the scope of this utility model.

Claims

1. A clamping tool for a bar, characterized in that, include: The base has a first clamping part and a second clamping part, which together form a clamping working surface; the first clamping part is coaxially disposed on the outside of the second clamping part and is slidably connected to the second clamping part so that the first clamping part can move axially relative to the second clamping part. A movable clamping part is slidably engaged with the base so that it faces and abuts against the first clamping part axially; wherein... When the movable clamping part abuts against the first clamping part, it can push the first clamping part away from the second clamping part along the axial direction, so that the clamping working surface is only formed by the second clamping part, so as to adapt to the bar with a diameter smaller than the set diameter.

2. The clamping fixture for bars according to claim 1, characterized in that, The second clamping part is provided with a connecting block, which is slidably engaged with the first clamping part; The first clamping part is provided with a snap-fit ​​groove, and the connecting block is at least partially slidably embedded in the snap-fit ​​groove to achieve locking and fixing between the first clamping part and the second clamping part; The movable clamping part is equipped with a trigger rod; When the movable clamping part moves axially toward the first clamping part, the trigger rod can abut against the connecting block, causing the connecting block to disengage from the snap-fit ​​groove, thereby releasing the locking state between the first clamping part and the second clamping part.

3. The clamping tool for a bar according to claim 2, characterized in that, The snap-fit ​​groove includes a first segment extending axially and a second segment extending in the width direction, wherein the first segment is used to embed the connecting block; wherein... Once the connecting block is disengaged from the first segment, it can enter the second segment and slide along its axial direction.

4. The clamping tool for a bar according to claim 3, characterized in that, The second segment is provided with a guide post, which is arranged along the axial direction of the second segment. The guide post is elastically connected to the connecting block so that the connecting block can be embedded in the first segment after sliding along the second segment.

5. The clamping tool for a bar according to claim 4, characterized in that, The movable clamping part is provided with a receiving groove, and the trigger rod can be slidably received in the receiving groove.

6. The clamping tool for a bar according to claim 5, characterized in that, The first clamping part is provided with a guide groove for guiding the trigger rod. The guide groove is parallel to the second segment and directly opposite the receiving groove. The guide groove is connected to the first segment.

7. The clamping tool for a bar according to claim 6, characterized in that, The trigger rod has a movable end, and the base has a stop block. When the movable clamping part abuts against the first clamping part, the movable end abuts against the stop block, so that the trigger rod extends out of the receiving groove.

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