Center hole pre-drilling clamp capable of being replaced and mounted quickly

Abstract

The utility model discloses a quick reloading centre hole pre-drilling clamp, which comprises a processing platform and a clamp tool, the clamp tool comprises a chuck body, a hydraulic driving assembly, a plurality of guide blocks, a plurality of mounting arms and a plurality of clamping jaws, the chuck body is of a hollow structure, and a plurality of sliding chutes in one-to-one correspondence with the guide blocks are formed in the top of the chuck body at equal intervals; the guide blocks are arranged in the sliding grooves in a sliding mode and can be driven by the hydraulic driving assembly to move inwards and / or inwards. And the mounting arm is detachably mounted at the top of the guide block. A traditional three-air-cylinder synchronous clamping centering method is changed into a hydraulic stretching synchronous clamping method, and the defect that products are not concentric in clamping can be overcome; in addition, multiple sets of positioning grooves and positioning blocks are designed between the clamping jaw and the mounting arm according to the outer diameter sizes of products of different models, fixation can be achieved through one screw during follow-up assembly, and the problem that time is wasted when the clamp is adjusted when the products of different outer diameters are replaced can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel hub processing, in particular to a fast-changing pre-drilled center hole fixture. Background Art

[0002] Aluminum alloy wheels are widely used in small cars, motorcycles, and electric bicycles due to their advantages such as light weight, strong load-bearing capacity, good surface finish, fast heat dissipation, wear resistance, and corrosion resistance. However, existing aluminum alloy wheels require pre-drilling of the center hole during machining. This process reduces the difficulty and time of subsequent machining operations.

[0003] Currently, before drilling the center hole, a three-cylinder (claw) chuck is required to synchronize clamping and centering. During the three-cylinder clamping process, due to unstable air pressure and gaps between connectors, asynchronous clamping is prone to occur, resulting in the workpiece not being in the center position, causing deviation when pre-drilling the center hole. In addition, when replacing different types of wheel hub products, the position of the jaws needs to be adjusted frequently due to changes in the outer diameter of the hub. Since the jaws are generally fixed to the fixture body by multiple screws and there are generally multiple jaws, adjusting the jaws is very time-consuming. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model aims to provide a quick-change pre-drilled center hole fixture.

[0005] The technical solution adopted by the present invention is as follows: a quick-change pre-drilling center hole fixture, including a processing platform and a fixture tooling, the fixture tooling including a chuck body, a hydraulic drive assembly and multiple guide blocks, mounting arms and clamping jaws, wherein the chuck body is a hollow structure and has multiple slide grooves equidistantly provided on its top corresponding to the guide blocks, the guide blocks are slidably arranged in the slide grooves and can be driven inward and / or moved inward by the hydraulic drive assembly; the mounting arm is detachably mounted on the top of the guide block, the mounting arm includes a fixing part and an adjusting part, the top of the adjusting part is provided with multiple positioning grooves and threaded holes spaced along its length direction, the clamping jaw is detachably mounted on the top of the adjusting part, and the bottom of the clamping jaw protrudes to form a positioning block that is adapted to be plugged into the positioning groove, for limiting the installation angle of the clamping jaw.

[0006] In a preferred embodiment, the top of the outer end of the clamping jaw is protruded to form a jaw surface, and a clamping area for fixing the workpiece is formed between the plurality of jaw surfaces.

[0007] In a preferred embodiment, the hydraulic drive assembly includes a hydraulic cylinder and an intermediate block, wherein the intermediate block is located at the center of the chuck body and is connected to the telescopic end of the hydraulic cylinder.

[0008] In a preferred embodiment, the intermediate block is truncated cone-shaped as a whole and has an outer end surface circumferentially provided with an oblique groove corresponding to the plurality of guide blocks, and the inner end of the guide block is provided with a slider that can guide and slide in the oblique groove.

[0009] In a preferred embodiment, the clamping jaw is provided with a through waist-shaped groove along its length direction, the waist-shaped groove and the plurality of threaded holes are located on the same central axis, and the clamping jaw is fixed to the mounting arm by screws.

[0010] In a preferred embodiment, the fixing portion and the adjusting portion are integrally formed, the bottom end of the fixing portion is provided with a plurality of upper serrations equidistantly along its length, and the upper end surface of the guide block is protruding with lower serrations adapted to engage with the upper serrations.

[0011] In a preferred embodiment, a plurality of mounting holes are formed on the fixing portion, and a second threaded hole corresponding to the mounting holes is formed on the top end of the guide block.

[0012] In a preferred embodiment, the hydraulic cylinder is installed at the bottom end of the processing platform, and the processing platform is provided with a through hole for the telescopic end of the hydraulic cylinder to pass through. The processing platform and the chuck body are fixed together by a plurality of circumferentially arranged bolts.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0014] 1. This utility model replaces the traditional three-cylinder synchronous clamping and centering method with a hydraulic tension synchronous clamping method. The hydraulic cylinder's expansion and contraction drives the middle block to move up and down. During this movement, the guide block and the clamping jaws can be simultaneously moved inward and outward, solving the problem of uneven clamping of products.

[0015] 2. In the present invention, multiple sets of corresponding positioning grooves and positioning blocks are designed between the clamping jaw and the mounting arm according to the outer diameter dimensions of different product models. The positioning grooves and positioning blocks can assist in locating the installation position of the clamping jaw. During assembly, it can be fixed with a single screw, which can solve the problem of time-consuming adjustment of the clamp when replacing products with different outer diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional plan structure of the utility model as a whole;

[0017] Figure 2 This is a schematic diagram of the overall planar structure of the fixture in the present invention;

[0018] Figure 3 This is a schematic cross-sectional plan view of the mounting arm of the present invention;

[0019] Figure 4 This is a schematic diagram of the cross-sectional planar structure of the clamping jaws of the present invention;

[0020] Figure 5 It is a schematic diagram of the top plan structure of the clamping jaws in the present invention.

[0021] Markings in the figure: 1-hydraulic cylinder, 2-force processing platform, 3-chuck body, 4-mounting arm, 41-fixing part, 411-upper serration, 412-mounting hole, 42-adjusting part, 421-threaded hole, 422-positioning groove, 5-clamping jaw, 51-jaw surface, 52-positioning block, 53-waist-shaped groove, 6-guide block, 7-intermediate block, 71-bevel groove, 8-bolt. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] A quick-change pre-drilled center hole fixture, refer to Figure 1-5 , including a processing platform 2 and a fixture, the fixture includes a chuck body 3, a hydraulic drive assembly and multiple guide blocks 6, a mounting arm 4 and a clamping claw 5, wherein: the chuck body 3 is a hollow structure and a plurality of slide grooves corresponding to the guide blocks 6 are opened at equal distances on its top, the guide blocks 6 are slidably arranged in the slide grooves and can be driven inward and / or outward by the hydraulic drive assembly. The hydraulic drive assembly includes a hydraulic cylinder 1 and an intermediate block 7. The intermediate block 7 is located at the center of the chuck body 3 and is connected to the telescopic end of the hydraulic cylinder 1. The intermediate block 7 is a frustum in shape and is Its outer end surface is circumferentially provided with inclined grooves 71 corresponding to multiple guide blocks 6, and the inner end of the guide block 6 is provided with a slider that can slide and guide in the inclined groove 71. The traditional three-cylinder synchronous clamping and centering method is changed to a hydraulic stretching synchronous clamping method. The middle block 7 is driven up and down by the extension and contraction of the hydraulic cylinder 1. In the process of the middle block 7 moving up and down, the cooperation of the inclined groove 71 and the slider can simultaneously drive the guide block 6 and the clamping jaw part to move inward and outward to realize automatic centering operation. Since the clamping jaw part moves at the same time, the defect of eccentricity of product clamping can be solved.

[0024] It should be noted that a hydraulic station or hydraulic system (not shown in the figure, with control buttons) connected to the hydraulic cylinder 1 can be set on one side of the processing platform 2, and the specific structure will not be described here in detail.

[0025] The number of guide blocks 6 is preferably three, but may also be four or even more, which is not limited here.

[0026] Furthermore, the mounting arm 4 can be detachably mounted on the top of the guide block 6. The mounting arm 4 includes a fixing portion 41 and an adjusting portion 42. The top of the adjusting portion 42 is provided with a plurality of positioning grooves 422 and threaded holes 421 spaced apart along its length. The clamping jaw 5 can be detachably mounted on the top of the adjusting portion 42. The bottom of the clamping jaw 5 protrudes to form a positioning block 52 that is adapted to be plugged into the positioning groove 422 and is used to limit the installation angle of the clamping jaw 5. Positioning grooves 422 and positioning blocks 52 are designed between the clamping jaw 5 and the mounting arm 4 according to the outer diameter dimensions of different product models. The positioning grooves 422 and the positioning blocks 52 can assist in positioning the installation position of the clamping jaw 5, thereby ensuring the accuracy of the subsequent positioning of the product by the clamping jaw 5. Secondly, during subsequent assembly, fixation can be achieved with one screw, making assembly more convenient.

[0027] Among them, scale values (not shown in the figure) can be designed on one side of different positioning grooves 422 to facilitate staff to find the corresponding size. In addition, when other models of products need to be drilled in the future, corresponding clamping tooling can also be designed.

[0028] Furthermore, a claw surface 51 is protruded from the top of the outer end of the clamping jaw 5 , and a clamping area for fixing the workpiece is formed between the multiple claw surfaces 51 , wherein an angle of 5° to 10° is formed between the claw surface 51 and the clamping jaw 5 .

[0029] Furthermore, the clamping jaw 5 is provided with a through waist-shaped groove 53 along its length direction, and the waist-shaped groove 53 and the multiple threaded holes 421 are on the same central axis. The clamping jaw 5 and the mounting arm 4 are fixed by screws (not shown in the figure). Since the clamping jaw 5 and the mounting arm 4 themselves achieve auxiliary positioning through the positioning part, a single screw can be used to achieve stable fixation of the clamping jaw 5 and the mounting arm 4. Secondly, the designed waist-shaped groove 53 can also meet the adjustment and fixing grooves in various positions.

[0030] Furthermore, the fixing portion 41 and the adjusting portion 42 are integrally formed parts, and a plurality of upper serrations 411 are equidistantly provided at the bottom end of the fixing portion 41 along its length direction. The upper end surface of the guide block 6 is protruding to form lower serrations that are adapted to engage with the upper serrations 411. The cooperation between the lower serrations and the upper serrations 411 can ensure the combined strength between the guide block 6 and the mounting arm 4.

[0031] Furthermore, a plurality of mounting holes 412 are provided on the fixing portion 41, and a second threaded hole corresponding to the mounting hole 412 is provided on the top of the guide block 6. Through the designed mounting holes 412 and the second threaded hole, the mounting arm 4 and the guide block 6 can be fixed together with screws.

[0032] Furthermore, the hydraulic cylinder 1 is installed at the bottom end of the processing platform 2. The processing platform 2 is provided with a through hole for the telescopic end of the hydraulic cylinder 1 to pass through. The processing platform 2 and the chuck body 3 are fixed together by multiple bolts 8 arranged circumferentially.

[0033] To sum up, changing the traditional three-cylinder synchronous clamping and centering method to the hydraulic stretching synchronous clamping method can simultaneously drive the clamping jaws to move inward and outward, which can solve the defect of eccentric clamping of products. In addition, multiple sets of positioning grooves 422 and positioning blocks 52 are designed between the clamping jaws 5 and the mounting arm 4 according to the outer diameter dimensions of different models of products. The positioning grooves 422 and the positioning blocks 52 can assist in positioning the installation position of the clamping jaws 5. During assembly, it can be fixed with one screw, which can solve the problem of time-consuming adjustment of the clamp when replacing products with different outer diameters.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quick-change pre-drilling center hole fixture, including a processing platform and a fixture tooling, characterized by: The fixture comprises a chuck body, a hydraulic drive assembly, and a plurality of guide blocks, mounting arms, and clamping jaws, wherein: The chuck body is a hollow structure and has a plurality of chute grooves equidistantly provided on its top, corresponding to the guide blocks one by one. The guide blocks are slidably arranged in the chute grooves and can be driven to move inward and / or outward by a hydraulic drive assembly; The mounting arm can be detachably mounted on the top of the guide block. The mounting arm includes a fixing portion and an adjusting portion. The top of the adjusting portion is provided with a plurality of positioning grooves and threaded holes spaced along its length. The clamp can be detachably mounted on the top of the adjusting portion. The bottom of the clamp protrudes to form a positioning block that fits into the positioning groove and is used to limit the installation angle of the clamp.

2. The quick-change pre-drilled center hole fixture according to claim 1, characterized in that: The top of the outer end of the clamping jaw is protruding to form a jaw surface, and a clamping area for fixing the workpiece is formed between the multiple jaw surfaces.

3. The quick-change pre-drilled center hole fixture according to claim 1, characterized in that: The hydraulic drive assembly includes a hydraulic cylinder and an intermediate block. The intermediate block is located at the center of the chuck body and is connected to the telescopic end of the hydraulic cylinder.

4. The quick-change pre-drilled center hole fixture according to claim 3, characterized in that: The intermediate block is in a truncated cone shape as a whole and has an outer end surface circumferentially provided with an oblique groove corresponding to the plurality of guide blocks. The inner end of the guide block is provided with a sliding block which can guide and slide in the oblique groove.

5. The quick-change pre-drilled center hole fixture according to claim 1, characterized in that: The clamping jaw is provided with a through waist-shaped groove along its length direction. The waist-shaped groove and the plurality of threaded holes are located on the same central axis. The clamping jaw is fixed to the mounting arm by screws.

6. The quick-change pre-drilled center hole fixture according to claim 1, characterized in that: The fixing portion and the adjusting portion are integrally formed. The bottom end of the fixing portion is provided with a plurality of upper serrations equidistantly along its length direction. The upper end surface of the guide block is protruding to form lower serrations adapted to engage with the upper serrations.

7. The quick-change pre-drilled center hole fixture according to claim 1, characterized in that: The fixing portion is provided with a plurality of mounting holes, and the top end of the guide block is provided with a second threaded hole corresponding to the mounting holes.

8. The quick-change pre-drilled center hole fixture according to claim 3, characterized in that: The hydraulic cylinder is installed at the bottom end of the processing platform. The processing platform is provided with a through hole for the telescopic end of the hydraulic cylinder to pass through. The processing platform and the chuck body are fixed together by a plurality of bolts arranged circumferentially.

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