Positioning tool for grinding spool bore

Abstract

The utility model provides a kind of positioning tool for valve core inner hole grinding, it is related to valve core inner hole processing technical field, including fixed subassembly, the fixed subassembly includes the taper sleeve base being installed in the right side of base, the right side of the taper sleeve base is connected with taper sleeve, the right side of the taper sleeve is provided with expansion sleeve, the right side of the expansion sleeve is provided with dowel, the inside of the base is provided with retraction pressure rod, by bolt, taper sleeve and taper sleeve base are fixed on base, so that subsequent dowel when extruding expansion sleeve, taper sleeve can keep stationary, provide radial force for expansion sleeve, by setting dowel and retraction pressure rod are threadedly connected, different specifications of expansion sleeve can be replaced by disassembling retraction pressure rod, by retraction pressure rod driving dowel left extruding expansion sleeve, make expansion sleeve left on taper sleeve, cooperate the radial force generated by the taper surface of taper sleeve, so that expansion sleeve radial expansion, the inner hole of valve core is supported, and fixed valve core by relying on the friction with valve core inner hole.

Description

Technical Field

[0001] This utility model relates to the field of valve core inner hole processing technology, and in particular to a positioning tool for grinding valve core inner holes. Background Technology

[0002] The machining of the valve core's inner bore is a core step in the manufacturing of fluid control components. Its precision and quality directly determine the system's functionality, reliability, and lifespan. As a key interface for the valve core and valve body, the geometric precision of the inner bore affects the control accuracy of the flow channel cross-section. Deviations will lead to flow characteristic drift or pressure fluctuations. Surface roughness and micromorphology determine the fit quality of the sealing pair. Microscopic defects can cause leakage or particle jamming. Dimensional consistency ensures the interchangeability of batch components and reduces system commissioning costs. Especially in high-pressure, high-frequency response, or cleanliness-critical operating conditions, the quality of the inner bore is directly related to the system's dynamic response speed, energy efficiency, and media contamination control capabilities.

[0003] A search revealed that the document with announcement number "CN216967095U" mentions "a positioning fixture for precision machining of the inner hole of a valve core with a large length-to-diameter ratio, including a sleeve and an end cap screwed to the rear end of the sleeve. One or more cylindrical positioning pins are fixed to the inner end face of the end cap. The front end of the sleeve is integrated with a flange. Multiple through holes with axial directions parallel to the sleeve's axis are opened on the flange. After the valve core is inserted into the sleeve, it has a clearance fit with the inner wall of the sleeve. The inner end of the valve core abuts against the inner end of the positioning pins. The sleeve and end cap can be inserted through the center hole of the chuck of a machining machine. Screws pass through the through holes and are fixed to the chuck of the machining machine. The chuck's angled jaws hold the valve core in front of the flange." In use, the large-area contact between the inner wall of the sleeve and the valve core reduces workpiece runout during machining, ensuring improved machining consistency and stability. The fixed length of the positioning pins avoids individual tool setting for batches of workpieces, improving production efficiency.

[0004] However, traditional valve core positioning devices are not stable and are prone to vibration during processing, which affects the processing accuracy. In addition, traditional valve core positioning devices can only adapt to a few specifications of valve cores and cannot meet the processing requirements when faced with other specifications of valve cores.

[0005] Therefore, we provide a positioning fixture for grinding the inner hole of the valve core to solve the above problems. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides a positioning fixture for grinding the inner hole of a valve core, aiming to solve the aforementioned problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A positioning fixture for grinding the inner hole of a valve core includes a base. A fixing component is installed on the right side of the base. The fixing component includes a conical sleeve base installed on the right side of the base. A conical sleeve is connected to the right side of the conical sleeve base. A tensioning sleeve is provided on the right side of the conical sleeve. A pressing pin is provided on the right side of the tensioning sleeve. A support column is installed on the right side of the pressing pin. A hydraulic rod is connected to the outer side of the right end of the support column. A support plate is installed at the end of the hydraulic rod.

[0009] As a further description of the above technical solution:

[0010] The conical sleeve base and the base are bolted together, while the conical sleeve base and the conical sleeve are welded together. The conical sleeve is a tapered cone shape that tapers from left to right.

[0011] As a further description of the above technical solution:

[0012] The tensioning sleeve is nested on the right side of the conical sleeve. The tensioning sleeve is a cylindrical structure in which metal parts and rubber are arranged alternately in the circumferential direction. The tensioning sleeve can achieve radial expansion.

[0013] As a further description of the above technical solution:

[0014] The base is provided with an internal retraction pressure rod, and the left end of the lower pressure nail is provided with a thread. The left cylindrical part of the lower pressure nail is threadedly connected to the internal retraction pressure rod through a through tension sleeve and a tapered sleeve.

[0015] As a further description of the above technical solution:

[0016] The lower pressure pin moves left and right via the inward pressure rod, and the diameter of the right cylindrical part of the lower pressure pin is larger than the inner diameter of the tensioning sleeve.

[0017] As a further description of the above technical solution:

[0018] The support column and the lower pressure nail are connected by threads. There are two sets of hydraulic rods and support plates, which are symmetrically arranged on the front and rear sides through the support column. The support column and support plate form a telescopic structure through the hydraulic rod.

[0019] As a further description of the above technical solution:

[0020] The support plate has a semi-arc structure, and a rubber filling layer is provided on the outer surface of the support plate.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model, through the setting of a fixing component, fixes the tapered sleeve and the tapered sleeve base to the base platform with bolts, so that when the subsequent pressing nail compresses the tensioning sleeve, the tapered sleeve can remain fixed and provide radial force to the tensioning sleeve. By setting the pressing nail and the inner shrinking rod to be threadedly connected, the inner shrinking rod can be disassembled to replace the tensioning sleeve of different specifications to adapt to the inner hole of the valve core of different diameters. The inner shrinking rod drives the pressing nail to press the tensioning sleeve to the left, causing the tensioning sleeve to move to the left on the tapered sleeve. The tapered surface of the tapered sleeve generates radial force, thereby causing the tensioning sleeve to expand radially and internally support the inner hole of the valve core. The valve core is fixed by friction with the inner hole of the valve core.

[0023] 2. This utility model uses hydraulic rods and support plates to support the valve core's inner hole by adjusting the extension and retraction of the support plates through two sets of hydraulic rods, thereby further fixing the valve core and enhancing stability. By setting a semi-circular support plate with a rubber-filled outer surface, the contact area and friction between the support plate and the valve core's inner hole are increased, further strengthening the fixation of the valve core and improving stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the mating structure of the tapered sleeve and the tensioning sleeve of this utility model;

[0026] Figure 3 This is a schematic diagram of the mating structure of the inward-retracting pressure bar and the downward-retracting pressure pin of this utility model;

[0027] Figure 4 This is a schematic diagram of the mating structure of the pressing nail and the support column of this utility model;

[0028] Figure 5 This is a schematic diagram of the cooperative structure of the support column, hydraulic rod and support plate of this utility model;

[0029] Figure 6 This is a schematic diagram showing the disassembled structure of the base and fixing components of this utility model.

[0030] The following are the labels in the diagram: 1. Base; 2. Fixing component; 201. Conical sleeve base; 202. Conical sleeve; 203. Tensioning sleeve; 204. Downward pressure pin; 205. Inward pressure bar; 206. Support column; 207. Hydraulic rod; 208. Support plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-6 As shown, this utility model provides a technical solution: a positioning fixture for grinding the inner hole of a valve core, including a base 1, a fixing component 2 installed on the right side of the base 1, the fixing component 2 including a conical sleeve base 201 installed on the right side of the base 1, a conical sleeve 202 connected to the right side of the conical sleeve base 201, a tensioning sleeve 203 provided on the right side of the conical sleeve 202, a pressing pin 204 provided on the right side of the tensioning sleeve 203, a support column 206 installed on the right side of the pressing pin 204, a hydraulic rod 207 connected to the outer side of the right end of the support column 206, and a support plate 208 installed at the end of the hydraulic rod 207.

[0033] Furthermore, the cone sleeve base 201 is bolted to the base 1, and the cone sleeve base 201 and the cone sleeve 202 are welded. The cone sleeve 202 is a tapered cone from left to right. The cone sleeve 202 and the cone sleeve base 201 are fixed to the base 1 by bolts, so that when the subsequent pressing nail 204 compresses the tensioning sleeve 203, the cone sleeve 202 can remain fixed. The tensioning sleeve 203 moves to the left on the cone sleeve 202, and the cone surface of the cone sleeve 202 generates a radial force on the tensioning sleeve 203, thereby causing the tensioning sleeve 203 to expand radially and provide internal support to the inner hole of the valve core.

[0034] Furthermore, the tensioning sleeve 203 is nested on the right side of the tapered sleeve 202. The tensioning sleeve 203 is a cylindrical structure in which metal parts and rubber are arranged alternately in the circumferential direction. The tensioning sleeve 203 can achieve radial expansion. By setting the tensioning sleeve 203 as a cylindrical structure in which metal parts and rubber are arranged alternately in the circumferential direction, the tensioning sleeve 203 can achieve radial expansion through the elastic deformation of rubber when subjected to the radial force of the tapered sleeve 202, thus supporting the inner hole of the valve core and fixing the valve core by friction with the inner hole of the valve core.

[0035] Furthermore, the base 1 is provided with an internal retraction rod 205, and the left end of the lower pressure pin 204 is provided with a thread. The left cylindrical part of the lower pressure pin 204 is threadedly connected to the internal retraction rod 205 through the tension sleeve 203 and the tapered sleeve 202. By setting the lower pressure pin 204 and the internal retraction rod 205 to be threadedly connected, the tension sleeve 203 of different specifications can be replaced by disassembling the internal retraction rod 205 to adapt to the valve core inner hole of different diameters.

[0036] Furthermore, the lower pressure pin 204 moves left and right via the inward retraction pressure rod 205. The diameter of the right cylindrical part of the lower pressure pin 204 is larger than the inner diameter of the tension sleeve 203. The inward retraction pressure rod 205 drives the lower pressure pin 204 to press the tension sleeve 203 to the left, causing the tension sleeve 203 to move to the left on the tapered sleeve 202. The tapered surface of the tapered sleeve 202 generates a radial force, causing the tension sleeve 203 to expand radially and support the inner hole of the valve core. The valve core is fixed by friction with the inner hole of the valve core.

[0037] Furthermore, the support column 206 and the lower pressure pin 204 are connected by threads. Two sets of hydraulic rods 207 and support plates 208 are provided and are symmetrically arranged on the front and rear sides through the support column 206. The support plate 208 forms a telescopic structure through the support column 206 and the hydraulic rods 207. The extension and retraction of the support plate 208 by the two sets of hydraulic rods 207 supports the inner hole of the valve core, further fixing the valve core and enhancing stability.

[0038] Furthermore, the support plate 208 has a semi-arc structure, and a rubber filling layer is attached to the outer surface of the support plate 208. By setting a semi-arc support plate 208 with a rubber filling layer on the outer surface, the contact surface and friction between the support plate 208 and the inner hole of the valve core are increased, the fixation of the valve core is strengthened, and the stability is improved.

[0039] Working principle: Install the device in the working position, then put the valve core on the outside of the tensioning sleeve 203. The inner compression rod 205 drives the lower pressure pin 204 to press the tensioning sleeve 203 to the left, causing the tensioning sleeve 203 to move to the left on the tapered sleeve 202. The tapered surface of the tapered sleeve 202 generates radial force, thereby causing the tensioning sleeve 203 to expand radially and support the inner hole of the valve core. The valve core is fixed by friction with the inner hole of the valve core. At the same time, the tapered sleeve 202 and the tapered sleeve base 201 are fixed to the base 1 by bolts to ensure that the tapered sleeve 202 is fixed during compression. Then, the hydraulic rod 207 at the end of the support column 206 extends and adjusts the support plate 208 to support the inner hole of the valve core. The semi-circular support plate 208 with a rubber filling layer on its surface can increase the contact surface and friction between the support plate 208 and the inner hole of the valve core, further fixing the valve core and enhancing stability. This completes the use of a positioning fixture for grinding the inner hole of the valve core.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for grinding the inner hole of a valve core, comprising a base (1), characterized in that: A fixing component (2) is installed on the right side of the base (1). The fixing component (2) includes a conical sleeve base (201) installed on the right side of the base (1). A conical sleeve (202) is connected to the right side of the conical sleeve base (201). A tensioning sleeve (203) is provided on the right side of the conical sleeve (202). A pressing nail (204) is provided on the right side of the tensioning sleeve (203). A support column (206) is installed on the right side of the pressing nail (204). A hydraulic rod (207) is connected to the outer side of the right end of the support column (206). A support plate (208) is installed at the end of the hydraulic rod (207).

2. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The conical sleeve base (201) is bolted to the base (1), and the conical sleeve base (201) is welded to the conical sleeve (202). The conical sleeve (202) is a tapered cone that tapers from left to right.

3. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The tensioning sleeve (203) is nested on the right side of the conical sleeve (202). The tensioning sleeve (203) is a cylindrical structure in which metal parts and rubber are arranged alternately in the circumferential direction. The tensioning sleeve (203) can achieve radial expansion.

4. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The base (1) is provided with an inward pressure rod (205), and the left end of the lower pressure nail (204) is provided with a thread. The left cylindrical part of the lower pressure nail (204) is threadedly connected to the inward pressure rod (205) through a through tension sleeve (203) and a tapered sleeve (202).

5. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The lower pressure pin (204) moves left and right by the inner pressure rod (205), and the diameter of the right cylindrical part of the lower pressure pin (204) is larger than the inner diameter of the tension sleeve (203).

6. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The support column (206) and the lower pressure nail (204) are connected by threads. Two sets of hydraulic rods (207) and support plates (208) are provided and are symmetrically arranged on the front and rear sides through the support column (206). The support column (206) and support plates (208) form a telescopic structure through the hydraulic rods (207).

7. The positioning fixture for grinding the inner hole of a valve core according to claim 1, characterized in that, The support plate (208) has a semi-arc structure, and the outer surface of the support plate (208) is covered with a rubber filling layer.

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