Crankshaft roundness measurement positioning fixture for a rotary compressor

Abstract

The utility model belongs to the field of machining precision measurement technology discloses a kind of crankshaft roundness measurement positioning fixture for rotor compressor, including positioning mounting seat, adjusting screw, positioning support, positioning pressing plate, V block and fixed pressure block;Positioning mounting seat is horizontally arranged, and positioning support is fixed in the side of positioning mounting seat;V block and fixed pressure block are vertically arranged in the top of positioning mounting seat, and positioning space is formed between V block and fixed pressure block, and the crankshaft to be measured is vertically arranged in positioning space;Adjusting screw is horizontally inserted in positioning support, and the end of adjusting screw is tightly contacted with V block;Among them, adjusting screw and positioning support are connected by thread;The first end of positioning pressing plate is connected with the top end of positioning support, and the second end lower surface of positioning pressing plate is closely contacted with the top end of V block and fixed pressure block;The utility model does not need repeatedly disassembling between different fixtures, and the eccentric shaft center can be quickly positioned.

Description

Technical Field

[0001] This utility model belongs to the field of precision measurement technology in mechanical processing, and relates to the field of rotary compressors, and particularly to a crankshaft roundness measurement and positioning fixture for rotary compressors. Background Technology

[0002] In a rotary compressor, the crankshaft is the core moving component, typically composed of a short shaft, an eccentric shaft, and a long shaft. Its structure and function directly affect the compressor's performance, efficiency, and reliability. Among these, the roundness of each part of the crankshaft is an important indicator for measuring its machining accuracy and operational reliability.

[0003] Currently, measuring the roundness of various parts of a crankshaft typically requires repeated disassembly and reassembly between a three-jaw or six-jaw universal clamp and a magnetic V-block. Furthermore, the center of the eccentric shaft must be manually located on the instrument platform, making the measurement difficult and inefficient. Specifically, when measuring the roundness of the short or long shaft portion of the crankshaft, a three-jaw or six-jaw universal clamp is usually used to fix the crankshaft. However, when measuring the roundness of the eccentric shaft, the three-jaw or six-jaw universal clamp must be disassembled, and the crankshaft to be measured must be fixed using a magnetic V-block. The position of the magnetic V-block must then be manually adjusted to achieve the roundness measurement of the eccentric shaft. At the same time, existing measurement and positioning methods easily cause wear on the three-jaw or six-jaw universal clamp, adversely affecting its accuracy. In addition, using a magnetic V-block for positioning can easily cause the crankshaft to become magnetized after measurement, thus affecting the normal use of the crankshaft. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides a crankshaft roundness measurement and positioning fixture for rotary compressors, thereby solving the technical problems of high measurement difficulty and low measurement efficiency in existing crankshaft roundness measurement methods. To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a crankshaft roundness measurement and positioning fixture for a rotary compressor, including a positioning mounting base, adjusting screws, positioning brackets, positioning pressure plates, V-blocks, and fixing pressure blocks; The positioning mounting base is horizontally arranged, and the positioning bracket is fixed to the side of the positioning mounting base; the V-block and the fixing pressure block are both vertically arranged above the positioning mounting base, and a positioning space is formed between the V-block and the fixing pressure block, and the crankshaft to be tested is vertically arranged in the positioning space; The adjusting screw is horizontally inserted into the positioning bracket, and the end of the adjusting screw is pressed against the V-block; wherein, the adjusting screw and the positioning bracket are connected by threads; The first end of the positioning plate is connected to the top of the positioning bracket, and the lower surface of the second end of the positioning plate is in close contact with the top of the V-block and the fixing block.

[0005] Furthermore, the sidewall of the V-shaped block is provided with a V-shaped opening groove, which is located on the side of the fixed pressure block; a protrusion is provided at the center of the sidewall of the fixed pressure block, which is located directly opposite the side of the V-shaped opening groove; wherein, the axis of the V-shaped opening groove and the axis of the protrusion are parallel to each other and are both arranged in the vertical direction.

[0006] Furthermore, the fixed pressure block is provided with fixed ear plates at both ends, and the fixed ear plates are fixedly connected to the two sides of the V-shaped opening groove by bolts.

[0007] Furthermore, a circular groove is provided at the center of the lower surface of the positioning mounting base, which is used to connect with the three-jaw universal clamp or six-jaw universal clamp of the cylindricity instrument.

[0008] Furthermore, the upper surface edge of the positioning mounting base is provided with engraved lines, which are corresponding to the circular groove.

[0009] Furthermore, the positioning bracket has a horizontal through hole at its center, and the adjusting screw passes through the horizontal through hole; the outer surface of the adjusting screw has an external thread, and the wall of the horizontal through hole has an internal thread; the external thread and the internal thread cooperate with each other.

[0010] Furthermore, both the external thread and the internal thread are fine-pitch threads.

[0011] Furthermore, the bottom end of the positioning bracket is fixedly connected to the side of the positioning mounting base by bolts.

[0012] Furthermore, there are two positioning pressure plates, which are arranged horizontally and parallel to each other and distributed on both sides of the crankshaft to be tested.

[0013] Furthermore, the first end of the positioning plate is fixedly connected to the top end of the positioning bracket by bolts.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a crankshaft roundness measurement positioning fixture for rotary compressors. Through the positioning space formed between the V-block and the fixed pressure block, the crankshaft to be measured can be vertically fixed in one go, eliminating the need for repeated disassembly and assembly between different fixtures, thus greatly saving roundness measurement time and improving measurement efficiency. Secondly, by utilizing the threaded connection between the adjusting screw and the positioning bracket, the position of the V-block can be adjusted by rotating the adjusting screw, thereby driving the crankshaft to be measured to make fine adjustments, achieving rapid positioning of the eccentric shaft center, significantly reducing the operational difficulty of roundness measurement. Furthermore, the lower surface of the second end of the positioning pressure plate is in close contact with the top ends of the V-block and the fixed pressure block, so that pressure is applied to the V-block and the fixed pressure block through the positioning pressure plate, avoiding shaking during the measurement process and improving measurement accuracy. At the same time, magnetic positioning is not required, avoiding the influence of magnetism on the quality after crankshaft measurement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A front sectional view of the crankshaft roundness measuring and positioning fixture for a rotary compressor provided by this utility model; Figure 2 This is a top view of the crankshaft roundness measuring and positioning fixture for a rotary compressor provided by this utility model.

[0017] Among them, 1 is the positioning mounting base, 2 is the adjusting screw, 3 is the positioning bracket, 4 is the positioning pressure plate, 5 is the V-block, 6 is the fixing pressure block, 7 is the crankshaft to be tested, 8 is the first bolt, 9 is the third bolt; 101 is the circular groove, 102 is the engraving line. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] This utility model provides a crankshaft roundness measurement and positioning fixture for a rotary compressor, including a positioning mounting base 1, an adjusting screw 2, a positioning bracket 3, a positioning pressure plate 4, a V-block 5, and a fixing pressure block 6; the positioning mounting base 1 is horizontally arranged, and the positioning bracket 3 is fixed to the side of the positioning mounting base 1; the V-block 5 and the fixing pressure block 6 are both vertically arranged above the positioning mounting base 1; wherein, a positioning space is formed between the V-block 5 and the fixing pressure block 6, and the crankshaft 7 to be measured is vertically arranged in the positioning space; the adjusting screw 2 is horizontally inserted into the positioning bracket 3, and the end of the adjusting screw 2 is pressed against the V-block 5; wherein, the adjusting screw 2 and the positioning bracket 3 are connected by threads; the first end of the positioning pressure plate 4 is connected to the top end of the positioning bracket 3, and the lower surface of the second end of the positioning pressure plate 4 is in close contact with the top end of the V-block 5 and the fixing pressure block 6.

[0020] The crankshaft roundness measuring and positioning fixture of this utility model uses the positioning space formed by the V-block and the fixed pressure block to vertically fix the crankshaft to be measured, avoiding repeated disassembly and assembly between three-jaw or six-jaw universal fixtures and magnetic V-blocks; the position of the V-block can be easily adjusted by adjusting the screw to quickly locate the center of the eccentric shaft, greatly improving measurement efficiency; its reasonable structure reduces component wear, stable positioning prevents crankshaft wobble, and improves measurement accuracy; it does not use magnetic positioning, avoiding the crankshaft becoming magnetized after measurement, ensuring crankshaft quality; at the same time, its simple structure and convenient adjustment reduce the difficulty of operation and enhance the convenience of operation.

[0021] The following specific embodiments further explain the supercritical carbon dioxide heating and power generation system provided by this utility model: Example As attached Figure 1-2 As shown, this embodiment provides a crankshaft roundness measurement and positioning fixture for a rotary compressor, including a positioning mounting base 1, an adjusting screw 2, a positioning bracket 3, a positioning pressure plate 4, a V-block 5, and a fixing pressure block 6.

[0022] The positioning mounting base 1 is a planar plate structure, and the positioning mounting base 1 is horizontally arranged; wherein, a circular groove 101 is provided at the center of the lower surface of the positioning mounting base 1, and the circular groove 101 is used to connect with the three-jaw universal clamp or six-jaw universal clamp of the cylindricity instrument; wherein, the lower end of the circular groove 101 is in communication with the lower surface of the positioning mounting base 1, and the upper end of the circular groove 101 extends vertically upward toward the upper surface of the positioning mounting base 1.

[0023] The positioning bracket 3 is vertically arranged on the side of the positioning mounting base 1, and the positioning bracket 3 is fixedly connected to the positioning mounting base 1; specifically, the positioning bracket 3 is a vertically arranged planar plate structure, and the bottom end of the positioning bracket 3 is fixedly connected to the side of the positioning mounting base 1 by the first bolt 8.

[0024] The V-shaped block 5 and the fixed pressure block 6 are both vertically arranged above the positioning mounting base 1, and a positioning space is formed between the V-shaped block 5 and the fixed pressure block 6. The crankshaft to be tested 7 is vertically arranged in the positioning space. The side wall of the V-shaped block 5 is provided with a V-shaped opening groove, and the V-shaped opening groove is arranged on the side close to the fixed pressure block 6.

[0025] Specifically, the first sidewall of the V-shaped block 5 is located near the positioning bracket 3 and is vertically parallel to the positioning bracket 3; wherein, the first sidewall of the V-shaped block 5 is a vertical plane; the second sidewall of the V-shaped block 5 is located away from the positioning bracket 3, that is, the second sidewall of the V-shaped block 5 is located near the fixing block 6; wherein, the second sidewall of the V-shaped block 5 has a V-shaped opening groove, the opening end of the V-shaped opening groove is in communication with the surface of the second sidewall of the V-shaped block 5, and the tip of the V-shaped opening groove extends toward the first side surface of the V-shaped block 5.

[0026] The fixed pressure block 6 has a protrusion at the center of its side wall, which faces the V-shaped opening groove. The axis of the V-shaped opening groove is parallel to the axis of the protrusion and both are vertical. It should be noted that the vertical space formed by the surface of the V-shaped opening groove and the surface of the protrusion serves as a positioning space for fixing the crankshaft 7 to be tested. The V-shaped opening groove and the protrusion create a clamping effect on the shaft wall of the crankshaft 7 to be tested, thereby limiting and fixing the crankshaft 7 in the radial and axial directions, and thus achieving the clamping and fixing of the crankshaft 7 to be tested.

[0027] The fixed pressure block 6 has fixed ear plates at both ends. One end of the fixed ear plate is fixedly connected to the end of the fixed pressure block 6, and the other end of the fixed ear plate extends horizontally away from the fixed pressure block 6. The fixed ear plate is fixedly connected to the two sides of the V-shaped opening groove by a second bolt. The fixed ear plate is fixedly connected to the two sides of the V-shaped opening groove by the second bolt to fix the V-shaped block 5, the crankshaft to be tested 7 and the fixed pressure block 6 into an integral structure.

[0028] The adjusting screw 2 is horizontally inserted into the positioning bracket 3, and the end of the adjusting screw 2 is tightly connected to the V-block 5. Specifically, the positioning bracket 3 has a horizontal through hole at its center, and the adjusting screw 2 passes through the horizontal through hole. The head of the adjusting screw 2 extends to the upper side of the positioning mounting base 1 and is tightly connected to the first side wall of the V-block 5. The outer surface of the adjusting screw 2 is provided with an external thread, and the wall of the horizontal through hole is provided with an internal thread. The external thread and the internal thread cooperate with each other. Preferably, both the external thread and the internal thread are fine threads. By using the threaded connection between the adjusting screw 2 and the positioning bracket 3, the position of the V-block 5 can be easily adjusted by rotating the adjusting screw 2, thereby driving the crankshaft 7 under test to be finely adjusted, and realizing the rapid positioning of the center of the eccentric shaft.

[0029] The positioning plate 4 is horizontally disposed at the top of the positioning bracket 3, and the first end of the positioning plate 4 is connected to the top of the positioning bracket 3; wherein, the first end of the positioning plate 4 and the top of the positioning bracket 3 are connected by a third bolt 9; the second end of the positioning plate 4 extends horizontally upward toward the positioning mounting base 1, and the lower surface of the second end of the positioning plate 4 is in close contact with the top of the V-block 5 and the fixing block 6; preferably, there are two positioning plates 4, which are horizontally parallel and distributed on both sides of the crankshaft 7 to be tested.

[0030] It should be noted that the top of the positioning bracket 3, the top of the V-block 5, and the top of the fixing block 6 are at the same horizontal height, so that the positioning plate 4 can be used to limit and fix the V-block 5 and the fixing block 6 in the vertical direction, so as to prevent the V-block 5 and the fixing block 6 from shaking or displacing during the roundness measurement process.

[0031] It is worth noting that the upper surface of the positioning mounting base 1 is provided with limiting bosses at both the front and rear ends. The limiting bosses are arranged along the axial direction of the positioning mounting base 1 and are perpendicular to the positioning bracket 3. The sidewalls of the limiting bosses contact the front or rear ends of the V-block 5 and the fixing block 6. By providing limiting bosses on the upper surface of the positioning mounting base 1, the limiting bosses at both the front and rear ends form a horizontal movement channel for the V-block 5 or the fixing block 6, ensuring that the V-block 5 or the fixing block 6 can move horizontally along the axial direction of the positioning mounting base 1, which facilitates the position adjustment of the V-block 5 and the fixing block 6 and prevents them from slipping off the positioning mounting base 1.

[0032] The upper surface edge of the positioning mounting base 1 is provided with engraved lines 102, which are correspondingly provided with the circular groove 101. Specifically, the engraved lines 102 include several marking lines, which are evenly distributed on the limiting protrusion of the V-shaped block 5. Among the several marking lines, the middle marking line is used as the 0 mark, which coincides with the center line of the circular groove. That is, the straight line containing the 0 mark passes through the center of the circular groove and is perpendicular to the axis of the positioning mounting base 1. The remaining marking lines are symmetrically distributed on both sides of the 0 mark.

[0033] Working principle: The crankshaft roundness measuring and positioning fixture described in this embodiment is used as follows: Place the positioning mounting base 1 on the measuring platform of the cylindricity tester, and connect the three-jaw universal clamp or six-jaw universal clamp of the cylindricity tester to the circular groove 101 of the positioning mounting base 1 to fix the entire crankshaft roundness measuring positioning clamp on the measuring instrument.

[0034] Next, the crankshaft 7 to be tested is placed vertically in the positioning space between the V-block 5 and the fixed pressure block 6. The vertical space enclosed by the surface of the V-shaped opening groove of the V-block 5 and the surface of the protrusion of the fixed pressure block 6 forms a clamp on the shaft wall of the crankshaft 7 to be tested, thereby limiting and fixing the crankshaft to be tested in the radial and axial directions.

[0035] Next, by rotating the adjusting screw 2, the position of the V-block 5 is adjusted because the end of the adjusting screw 2 is tightly connected to the V-block 5. This, in turn, drives the crankshaft under test to be finely adjusted, thereby achieving rapid positioning of the center of the eccentric shaft. When rotating the adjusting screw 2, the engraved markings are used as auxiliary positioning marks to assist the operator in positioning and measurement operations.

[0036] Next, the positioning plate 4 is used to vertically limit and fix the V-block 5 and the fixing block 6; then the roundness measurement operation of the crankshaft 7 to be tested is started.

[0037] The crankshaft roundness measuring and positioning fixture for a rotary compressor described in this utility model uses an adjusting screw 2 connected to a positioning bracket 3 via a threaded connection. Rotating the adjusting screw 2 allows for easy adjustment of the position of the V-block 5, thereby driving the crankshaft 7 under test to make fine adjustments and achieving rapid positioning of the eccentric shaft center. Compared to the traditional method of manually locating the eccentric shaft center on an instrument platform, the positioning process is much faster, reducing measurement preparation time. Once installed, the crankshaft roundness measuring and positioning fixture does not require repeated disassembly and reassembly of different fixtures, allowing direct measurement of different parts of the crankshaft, greatly saving measurement time and improving overall measurement efficiency.

[0038] In this invention, the V-shaped opening groove of the V-block 5 and the protrusion of the fixing block 6 form a positioning space, which clamps the crankshaft 7 to be measured, providing precise radial and axial positioning and fixing. This effectively prevents the crankshaft from shaking or displacing during the measurement process, ensuring the stability of the crankshaft during measurement and thus improving the accuracy of roundness measurement. The positioning plate 4 provides vertical positioning and fixing for the V-block 5 and the fixing block 6, while the positioning boss on the positioning mounting base 1 ensures that the V-block 5 and the fixing block 6 move horizontally along the axis of the positioning mounting base 1, preventing shaking or displacement of the V-block 5 and the fixing block 6 during roundness measurement and further ensuring the accuracy of the measurement. In addition, the engraved mark 102 set on the upper surface edge of the positioning mounting base 1, with the 0 mark coinciding with the center line of the circular groove 101, can serve as an auxiliary positioning mark, helping operators to perform positioning and measurement operations more accurately, reducing human error and improving measurement accuracy.

[0039] In this invention, a circular groove 101 is provided on the lower surface of the positioning mounting base 1, and the circular groove 101 is connected to the three-jaw universal clamp or six-jaw universal clamp of the cylindricity measuring instrument. This makes it suitable for different types of cylindricity measuring instruments and has a certain degree of versatility. At the same time, the clamp can meet the roundness measurement needs of different parts of the crankshaft of a rotary compressor, eliminating the need to design multiple special clamps for different parts, thus improving the utilization rate and applicability of the clamp. In addition, it can avoid repeated disassembly and assembly of the crankshaft to be measured and manual centering, improving the efficiency and accuracy of measurement, reducing the workload of measurement personnel, and preventing the workpiece to be measured from becoming magnetized. The clamp is suitable for clamping and fixing the roundness of the long and short shafts and the roundness of the eccentric shaft of crankshafts of different lengths or outer diameters in rotary compressors, and can be applied to crankshaft roundness measurement in different application fields. Furthermore, the clamp does not require magnetic positioning, fundamentally avoiding the problem of crankshaft magnetization, ensuring the quality and performance of the crankshaft, and enabling it to be better applied in rotary compressors.

[0040] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A crankshaft roundness measuring and positioning fixture for a rotary compressor, characterized in that, It includes a positioning mounting base (1), adjusting screws (2), positioning brackets (3), positioning pressure plate (4), V-block (5), and fixing pressure block (6); The positioning mounting base (1) is horizontally set, and the positioning bracket (3) is fixed to the side of the positioning mounting base (1); the V-block (5) and the fixing block (6) are both vertically set above the positioning mounting base (1), and a positioning space is formed between the V-block (5) and the fixing block (6), and the crankshaft (7) to be tested is vertically set in the positioning space; The adjusting screw (2) is horizontally inserted into the positioning bracket (3), and the end of the adjusting screw (2) is pressed against the V-block (5); wherein the adjusting screw (2) and the positioning bracket (3) are connected by threads. The first end of the positioning plate (4) is connected to the top of the positioning bracket (3), and the lower surface of the second end of the positioning plate (4) is in close contact with the top of the V-shaped block (5) and the fixing block (6).

2. The crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The side wall of the V-shaped block (5) is provided with a V-shaped opening groove, which is located on the side of the fixed pressure block (6); a protrusion is provided at the center of the side wall of the fixed pressure block (6), which is located on the side of the V-shaped opening groove; wherein, the axis of the V-shaped opening groove and the axis of the protrusion are parallel to each other and are both arranged in the vertical direction.

3. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 2, characterized in that, The fixed pressure block (6) is provided with fixed ear plates at both ends, and the fixed ear plates are fixedly connected to the two sides of the V-shaped opening groove by bolts.

4. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The lower surface of the positioning mounting base (1) is provided with a circular groove (101) at its center. The circular groove (101) is used to connect with the three-jaw universal clamp or the six-jaw universal clamp of the cylindricity instrument.

5. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 4, characterized in that, The upper surface edge of the positioning mounting base (1) is provided with engraved lines (102), and the engraved lines (102) are correspondingly provided with the circular groove (101).

6. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The positioning bracket (3) has a horizontal through hole in the center, and the adjusting screw (2) passes through the horizontal through hole; the outer surface of the adjusting screw (2) is provided with an external thread, and the wall of the horizontal through hole is provided with an internal thread; the external thread and the internal thread cooperate with each other.

7. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 6, characterized in that, Both the external thread and the internal thread are fine-pitch threads.

8. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The bottom end of the positioning bracket (3) is fixedly connected to the side of the positioning mounting base (1) by bolts.

9. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The number of positioning pressure plates (4) is two, and the two positioning pressure plates (4) are arranged horizontally and parallel to each other, and distributed on both sides of the crankshaft (7) to be tested.

10. A crankshaft roundness measuring and positioning fixture for a rotary compressor according to claim 1, characterized in that, The first end of the positioning plate (4) is fixedly connected to the top end of the positioning bracket (3) by bolts.

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