A synchronous flexible clamping scroll compressor cross ring clamp

Abstract

A synchronous flexible clamping scroll compressor cross-ring fixture belongs to the field of machining technology. This invention solves the problems of uneven workpiece force and workpiece deformation caused by existing hydraulic clamps. The reference ring is fixedly connected to the reference plate, and the cross-ring is mounted on the reference ring. A first bushing and a second bushing are mounted on the reference plate. The first guide pin and the second guide pin are slidably connected to their respective bushings. The other ends of the first guide pin and the second guide pin are threaded to the pressure plate. The pressure plate and the reference plate are connected by a drive bolt, and a return spring is sleeved around the periphery of the drive bolt. This invention employs a linkage structure that synchronously controls the movement of the pressure plate using the drive bolt, ensuring that multiple stop bolts on the pressure plate can evenly contact and clamp the workpiece, resulting in uniform force on the workpiece. This greatly avoids local deformation caused by uneven clamping and ensures the shape accuracy and surface quality of the workpiece during machining.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more particularly to a synchronous flexible clamping cross ring clamp for a scroll compressor. Background Technology

[0002] Currently, a two-station hydraulic fixture is commonly used in the milling process of the cross ring of a scroll compressor. This fixture uses standard hydraulic components, positioning the cross ring via a fixture reference block. It employs a hydraulic pressing clamping method, with three pressure plates pressing down to clamp the cross ring onto the fixture. Subsequently, the FS surface and key of the cross ring are milled. However, the aforementioned hydraulic fixture has the following shortcomings in practical applications: Firstly, regarding the synchronization of the pressure plates, the three independent pressure plates rely on hydraulic drive to press down. Due to pressure fluctuations and response time differences in the hydraulic circuit, the pressing actions of the three pressure plates are not synchronized, causing uneven force on the cross ring during clamping, resulting in local deformation and stress concentration, which in turn affects the perpendicularity (required ≤0.004mm) and flatness (required ≤0.004mm) after processing. Secondly, regarding the positioning and clamping structure, both the positioning block and the pressure plate adopt a raised positioning point design, made of hard alloy, forming a hard point contact with the cross ring. This contact method is prone to causing indentations or damage to the surface of the cross ring, affecting surface quality; at the same time, the positioning points are prone to wear after long-term use, leading to a decrease in positioning accuracy. Furthermore, regarding vibration damping performance, the clamping plate, made of cemented carbide, is in direct contact with the cross ring, lacking a buffer structure. The cutting forces generated during machining cannot be effectively released or absorbed by the clamping device, leading to vibration marks on the surface of the cross ring and the accumulation of residual machining stress inside the workpiece. In particular, during the perpendicularity machining of the four keys, quality problems such as excessive perpendicularity occasionally occur at the high key area.

[0003] Therefore, how to provide a cross ring clamp that can achieve synchronous action of the pressure plate, adopt a flexible contact method, improve clamping stability and reduce processing deformation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems and provides a synchronous flexible clamping scroll compressor cross ring clamp.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a synchronous flexible clamping scroll compressor cross ring clamp, wherein the cross ring clamp is installed on a reference plate, and multiple cross ring clamps are installed on each reference plate, including a reference ring, a pressure plate, a first guide pin and a second guide pin. The reference ring is fixedly connected to the reference plate, and the cross ring is installed on the reference ring. A first bushing and a second bushing are installed on the reference plate. The first guide pin and the second guide pin are slidably connected to the corresponding bushings. The other end of the first guide pin and the second guide pin is threaded to the pressure plate. The pressure plate is connected to the reference plate by a drive bolt. A return spring is sleeved on the periphery of the drive bolt. Multiple stop bolts are provided at the bottom end of the pressure plate, and each stop bolt has a polyurethane layer at its end. The pressure plate is pressed against the top of the cross ring by the stop bolts.

[0006] Furthermore, the parallelism between the positioning surface and the bottom surface of the reference ring is ≤0.002mm.

[0007] Furthermore, a plurality of guide pins are axially inserted on the reference ring, and a spring is provided between each guide pin and the reference plate. The position of the guide pin is adjusted by floating axially through the spring.

[0008] Furthermore, the top end of the guide pin is an arc surface, and its bottom diameter is larger than its top diameter.

[0009] Furthermore, the reference ring is provided with a plurality of locking copper pins along the circumferential direction, each of the locking copper pins being radially corresponding to a guide pin and locking its position by radially abutting against the guide pin.

[0010] Furthermore, the reference ring is also provided with a diamond-shaped positioning pin and a circular positioning pin, which are vertically aligned with the positioning holes of the cross ring.

[0011] Furthermore, the first guide pin is a circular guide pin, and the second guide pin is a diamond-shaped guide pin.

[0012] Compared with the prior art, the present invention has the following advantages: This invention achieves axial positioning through a reference ring and radial positioning by using a combination of rhomboid and circular locating pins, forming a composite positioning method that combines surfaces and points. This method significantly improves the rigidity, accuracy, and long-term stability of the positioning system, effectively maintaining a high-precision positioning reference, thus providing a reliable guarantee for subsequent precision machining of the workpiece. This invention employs a linkage structure in which the movement of the pressure plate is synchronously controlled by a single drive bolt, ensuring that multiple stop bolts on it can simultaneously and evenly contact and clamp the workpiece. This design fundamentally guarantees the symmetry and synchronicity of the clamping force, making the workpiece subjected to uniform force and greatly avoiding local deformation caused by uneven clamping, thereby stably achieving the ultra-high machining accuracy requirement of the cross ring's perpendicularity within 0.004mm; This invention achieves flexible clamping through the polyurethane layer at the end of the stop bolt, which can effectively absorb cutting vibration, help control residual stress during processing, significantly improve the stability and protection of clamping, and ensure the shape accuracy and surface quality of the workpiece during processing. This invention enables the clamping and unclamping of all pressure plates through a single drive bolt, combined with the automatic return function of the return spring, achieving rapid workpiece clamping and unclamping. This efficient clamping mechanism increases the number of machining stations that can be completed in a single clamping operation to three, significantly reducing the number of tool changes and the number of rotation and positioning operations of the machining center pallet, thereby greatly improving overall production efficiency. It is particularly suitable for batch precision machining of scroll compressor cross rings. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A three-dimensional structural diagram of a cross-ring clamp for synchronous flexible clamping of a scroll compressor; Figure 2 Front view of a cross-ring clamp for a scroll compressor with synchronous flexible clamping; Figure 3 This is an assembly diagram of the cross-ring clamp and the cross-ring in this invention; Figure 4 This is a schematic diagram showing the positional relationship between the cross-shaped ring clamp and the reference plate in this invention; Figure 5 This is a three-dimensional structural diagram of the cross-shaped ring from a first perspective in this invention; Figure 6 This is a three-dimensional structural diagram of the cross-shaped ring from a second perspective in this invention; In the diagram: 1. Reference plate; 2. First bushing; 3. Reference ring; 4. Pressure plate; 5. Circular guide pin; 6. Diamond guide pin; 7. Positioning pin; 8. Second bushing; 9. Drive bolt; 10. Stop bolt; 13. Guide pin; 15. Return spring; 16. Clamping copper pin; 17. Diamond positioning pin; 18. Circular positioning pin. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0019] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0020] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0022] See appendix Figure 1-6This embodiment describes a synchronous flexible clamping scroll compressor cross-ring clamp. The cross-ring clamp is mounted on a reference plate 1. Multiple cross-ring clamps are mounted on each reference plate 1, including a reference ring 3, a pressure plate 4, a first guide pin, and a second guide pin. The reference ring 3 is fixedly connected to the reference plate 1, and the cross-ring is mounted on the reference ring 3. A first bushing 2 and a second bushing 8 are mounted on the reference plate 1. The first guide pin and the second guide pin are slidably connected to their respective bushings. The other ends of the first guide pin and the second guide pin are threaded to the pressure plate 4. The pressure plate 4 is connected to the reference plate 1 via a drive bolt 9. A return spring 15 is sleeved around the periphery of the drive bolt 9. Multiple stop bolts 10 are provided at the bottom end of the pressure plate 4, and each stop bolt 10 has a polyurethane layer at its end. The pressure plate 4 is pressed against the top of the cross-ring by the stop bolts 10. Preferably, each reference plate 1 has three cross-ring clamps. Specifically, the reference plate 1 is a rectangular plate structure with a thickness of 30mm, fixedly installed on the workpiece axis B of a general-purpose horizontal machining center, used to support the various components of the fixture. The reference plate 1 has countersunk holes for bolts, the depth of which is such that the top surface of the bolt is lower than the surface of the reference plate 1 after installation. A locating pin 7 is inserted into the locating hole of the reference plate 1 and the B axis of the machine, used for the installation and positioning of the reference plate 1. The locating pin 7 has an M5 through hole in its center for easy installation and disassembly.

[0023] Axial positioning is achieved through the reference ring 3, and radial positioning is achieved by the cooperation of the rhomboid positioning pin 17 and the circular positioning pin 18, forming a composite positioning method combining surface and point. This method significantly improves the rigidity, accuracy and long-term stability of the positioning system, and can effectively maintain a high-precision positioning reference, thus providing a reliable guarantee for the subsequent precision machining of the workpiece; a linkage structure in which the movement of the pressure plate 4 is synchronously controlled by a single drive bolt 9 ensures that the multiple stop bolts 10 on it can simultaneously and evenly contact and press the workpiece. This design fundamentally ensures the symmetry and synchronization of clamping forces, resulting in uniform force on the workpiece and greatly avoiding local deformation caused by uneven clamping. This allows for the stable achievement of ultra-high machining accuracy requirements for the perpendicularity of the cross ring within 0.004mm. Flexible clamping is achieved through the polyurethane layer at the end of the stop bolt 10, effectively absorbing cutting vibrations, helping to control residual machining stress, and significantly improving clamping stability and protection, ensuring the shape accuracy and surface quality of the workpiece during machining. A single drive bolt 9 can simultaneously clamp and release all pressure plates 4, and combined with the automatic return function of the return spring 15, it enables rapid workpiece clamping and unclamping. This efficient clamping mechanism increases the number of machining stations that can be completed in a single clamping operation to three, significantly reducing the number of tool changes and the number of rotational positioning operations on the machining center pallet, thereby greatly improving overall production efficiency. It is particularly suitable for batch precision machining of scroll compressor cross rings.

[0024] The parallelism between the positioning surface and the bottom surface of the reference ring 3 is ≤0.002mm. This ultra-high precision reference effectively controls the accumulation of errors during clamping and machining, providing an extremely stable and accurate positioning basis for the workpiece, and fundamentally ensuring the machining accuracy of subsequent processes.

[0025] Multiple guide pins 13 are axially threaded onto the reference ring 3, and a spring is provided between each guide pin 13 and the reference plate 1. The position of the guide pin 13 is adjusted by floating axially through the spring. The guide pin 13 achieves axial floating support through the spring, so that the cross ring is subjected to uniform force and the local deformation of the clamping part is reduced.

[0026] The top end of the guide pin 13 is an arc surface, and its bottom diameter is larger than its top diameter. The arc surface of the guide pin 13 can effectively avoid damage to the workpiece surface, and its increased bottom diameter can provide a larger contact area for the spring below it.

[0027] The reference ring 3 is provided with a plurality of locking copper pins along the circumferential direction. Each locking copper pin is radially corresponding to a guide pin 13 and locks its position by radially abutting against the guide pin 13.

[0028] The reference ring 3 is also provided with a rhomboid positioning pin 17 and a circular positioning pin 18, which are vertically aligned with the positioning holes of the cross ring. This is used for radial positioning of the cross ring.

[0029] The first guide pin is a circular guide pin 5, and the second guide pin is a rhomboid guide pin 6. The combination of the circular and rhomboid guide pins 6 can achieve high-precision positioning in a coordinated manner, which can effectively constrain multiple degrees of freedom and avoid over-positioning interference, thus ensuring the accuracy and reliability of positioning.

[0030] The present invention provides a synchronous flexible clamping scroll compressor cross ring clamp, the working steps of which are described below: During clamping, the cross-shaped ring workpiece is placed on the reference ring 3 according to the positions of the diamond-shaped locating pin 17 and the circular locating pin 18, completing axial and radial positioning. Rotating the drive bolt 9 moves the pressure plate 4 downwards, causing the polyurethane end of the stop bolt 10 to evenly contact and press down on the cross-shaped ring, completing clamping. During machining, the guide pin 13 floats and supports the bottom of the cross-shaped ring under the action of the spring below, and the polyurethane layer of the stop bolt 10 absorbs cutting vibrations. After machining, rotating the drive bolt 9 in the opposite direction causes the pressure plate 4 to automatically return to its original position under the action of the return spring 15, facilitating workpiece removal.

[0031] The present invention provides a synchronous flexible clamping scroll compressor cross ring clamp, the specific working process of which is described below: I. Component Installation and Debugging The reference plate 1 is positioned by the locating pin 7 and fixedly installed on the workpiece axis B of the horizontal machining center by bolts. After installation, the flatness of the reference plate 1 is checked using a dial indicator to ensure it is ≤0.002mm.

[0032] The reference ring 3 is fixed at the center of the reference plate 1, and the parallelism between its positioning surface and the bottom surface is ≤0.002mm. The rhomboid positioning pin 17 and the circular positioning pin 18 are respectively installed on the reference ring 3. After installation, check the center distance between the rhomboid positioning pin 17 and the circular positioning pin 18 to ensure that it is consistent with the positioning hole distance on the cross ring workpiece.

[0033] The first bushing 2 and the second bushing 8 are pressed into the guide holes of the reference plate 1 respectively, and the circular guide pin 5 and the diamond guide pin 6 are inserted into the corresponding bushings respectively. They should slide smoothly without jamming.

[0034] The pressure plate 4 is connected to the circular guide pin 5, the diamond guide pin 6, and the drive bolt 9, respectively. After installation, rotate the drive bolt 9 to check whether the pressure plate 4 moves and whether the ends of the stop bolt 10 are on the same horizontal plane. If there is any deviation, it can be corrected by adjusting the positions of the circular guide pin 5 and the diamond guide pin 6 or by grinding the connecting holes of the pressure plate 4.

[0035] The guide pin 13 is inserted into the guide hole of the base plate 1, and a spring is placed at its bottom. The clamping copper pin 16 abuts against the outer diameter surface of the guide pin 13, and the initial height of the guide pin 13 can be adjusted by the set screw.

[0036] The reset spring 15 is sleeved on the drive bolt 9 and is located between the bottom of the pressure plate 4 and the reference plate 1, and is used for the automatic reset of the pressure plate 4.

[0037] II. Clamping Operation Steps Step 1: Placement of the workpiece The operator picks up the cross ring workpiece, aligns the two positioning holes on the workpiece with the rhomboid positioning pin 17 and the circular positioning pin 18 on the reference ring 3, and gently inserts it so that the bottom surface of the workpiece contacts the positioning surface of the reference ring 3.

[0038] Step 2: Location Confirmation Check whether the workpiece is fully aligned with the positioning surface of the reference ring 3, and whether the diamond-shaped positioning pin 17 and the circular positioning pin 18 are fully inserted into the positioning hole of the workpiece. If there is any offset, the position of the workpiece can be slightly adjusted.

[0039] Step 3: Clamp Rotate the drive bolt 9 clockwise with a wrench. The rotational motion of the drive bolt 9 is converted into linear motion, pushing the pressure plate 4 downwards along the circular guide pin 5 and the diamond guide pin 6. Continue rotating the drive bolt 9 until the polyurethane end of the stop bolt 10 contacts the upper surface of the cross ring. Depending on the workpiece size and processing requirements, the extension length of the stop bolt 10 can be adjusted by rotating it to control the clamping force, ensuring that the three stop bolts 10 are evenly distributed on the workpiece surface and that the clamping force is consistent.

[0040] Step 4: Guide pin 13 self-adaptive During clamping, the guide pin 13 automatically adapts to the shape of the bottom surface of the cross ring under the action of the spring, providing flexible auxiliary support. The spring force should be calculated in advance to ensure that it can effectively support the workpiece without causing deformation due to excessive spring force.

[0041] Step 5: Processing After clamping, start the horizontal machining center. The B-axis rotates as needed, and the milling cutter sequentially mills the FS surface of the cross ring and the four keys. During machining, the polyurethane layer of the stop bolt 10 absorbs cutting vibration, and the guide pin 13 floats and supports the bottom of the cross ring under the action of the spring, together ensuring machining stability.

[0042] Step 6: Workpiece disassembly After machining, use a wrench to rotate the drive bolt 9 counterclockwise. The pressure plate 4 will automatically return to its original position under the action of the return spring 15. Remove the machined cross ring workpiece, check the machining quality, and prepare for clamping the next workpiece.

[0043] III. Key Parameter Settings Clamping force control: The extension length of the stop bolt 10 should be adjusted according to the material and size of the cross ring. For aluminum cross rings, it is recommended that the clamping force be controlled between 50N and 80N, which can be achieved by applying the corresponding torque to the drive bolt 9 with a torque wrench.

[0044] Selection of the spring below the guide pin 13: The spring force should meet the following requirements: the spring force should not exceed 30N when fully compressed, and it should be able to support the guide pin 13 when fully relaxed. A cylindrical compression spring with a wire diameter of 0.8mm, an outer diameter of 8mm, and a free length of 15mm is recommended.

[0045] Guide pin fit clearance: The fit clearance between the round guide pin 5 and the diamond guide pin 6 and the first bushing 2 and the second bushing 8 should be controlled between 0.01mm and 0.02mm to ensure smooth sliding without shaking.

[0046] IV. Precautions Before each clamping, the positioning surface of the reference ring 3, the diamond-shaped positioning pin 17, and the circular positioning pin 18 should be cleaned to avoid chips affecting the positioning accuracy.

[0047] Regularly inspect the polyurethane layer at the end of the stop bolt 10. If wear or damage is found, replace it promptly.

[0048] If vibration marks or flatness deviations are found during processing, check whether the clamping force is too large or too small, and whether the guide pin 13 floats flexibly.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A synchronous flexible clamping scroll compressor cross ring clamp, wherein the cross ring clamp is mounted on a reference plate (1), and multiple cross ring clamps are mounted on each reference plate (1), characterized in that: The device includes a reference ring (3), a pressure plate (4), a first guide pin, and a second guide pin. The reference ring (3) is fixedly connected to the reference plate (1). A cross ring is installed on the reference ring (3). A first bushing (2) and a second bushing (8) are installed on the reference plate (1). The first guide pin and the second guide pin are slidably connected in the corresponding bushings. The other end of the first guide pin and the second guide pin is threaded to the pressure plate (4). The pressure plate (4) is connected to the reference plate (1) by a drive bolt (9). A reset spring (12) is sleeved on the periphery of the drive bolt (9). The bottom end of the pressure plate (4) is provided with multiple stop bolts (10), and the end of each stop bolt (10) is provided with a polyurethane layer. The pressure plate (4) is pressed against the top of the cross ring by the stop bolts (10).

2. The synchronous flexible clamping scroll compressor cross ring clamp according to claim 1, characterized in that: The parallelism between the positioning surface and the bottom surface of the reference ring (3) is ≤0.002mm.

3. The synchronous flexible clamping scroll compressor cross ring clamp according to claim 1, characterized in that: Multiple guide pins (13) are axially inserted on the reference ring (3), and a spring is provided between each guide pin (13) and the reference plate (1). The position of the guide pin (13) is adjusted by floating along the axial direction through the spring.

4. The synchronous flexible clamping scroll compressor cross ring clamp according to claim 3, characterized in that: The top of the guide pin (13) is an arc surface, and its bottom diameter is larger than its top diameter.

5. A synchronous flexible clamping scroll compressor cross ring clamp according to claim 3, characterized in that: The reference ring (3) is provided with a plurality of locking copper pins along the circumferential direction. Each locking copper pin is radially corresponding to a guide pin (13) and locks its position by radially abutting against the guide pin (13).

6. The synchronous flexible clamping scroll compressor cross ring clamp according to claim 1, characterized in that: The reference ring (3) is also provided with a rhombus-shaped positioning pin (17) and a circular positioning pin (18), which are vertically opposite to the positioning holes of the cross ring.

7. The synchronous flexible clamping scroll compressor cross ring clamp according to claim 1, characterized in that: The first guide pin is a circular guide pin (5), and the second guide pin is a rhomboid guide pin (6).

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