A cold press measuring device

Abstract

The present invention provides a cold press measuring device, which includes a measuring mechanism and a supporting mechanism supporting the measuring mechanism, wherein the measuring mechanism includes a lower pressure head, a base supporting the lower pressure head, a measuring needle placed in the lower pressure head, and a displacement sensor coaxial with the measuring needle and placed in the base, the crankshaft is pressed on a boss higher than the upper end surface of the lower pressure head, the pump body is pressed on the measuring needle, the lower end of the measuring needle partially located in a through hole on one side of the lower pressure head is placed on the displacement sensor, and the upper end of the displacement sensor is placed in a first through hole coaxial with the through hole and communicating with the upper end surface of the base. In this way, the measuring component and the supporting component are combined together, the measuring point is close to the supporting point, and the tilted placement of the workpiece does not affect the measurement result; a piston is added between the measuring needle and the displacement sensor to prevent the measuring needle from directly contacting the displacement sensor, thereby reducing the failure rate of the displacement sensor.

Description

Technical Field

[0001] The invention relates to the technical field of cold press equipment, and in particular to a cold press measuring device. Background Art

[0002] When the compressor rotor is cold pressed into the compressor crankshaft by a cold press, the crankshaft 4 is sleeved on the pump body 5, but there is a certain gap between the crankshaft sector 41 and the lower end surface 51 of the pump body, such as Fig.12 and Fig.13 As shown, when the crankshaft is pressed against the lower pressure head, the pump body can still be pressed down a certain distance (2 to 6 mm). This is because there are tolerances in the manufacturing of the crankshaft and the pump body. This distance varies depending on the individual crankshafts and pump bodies. Before cold pressing the rotor onto the crankshaft 4, the position of the pump body needs to be set according to the upper and lower clearances between the crankshaft and the pump body provided by the compressor manufacturer. This requires measuring the upper and lower clearances between the crankshaft and the pump body to determine the position of the pump body 5. In the existing device for measuring the gap value, the crankshaft supporting mechanism and the measuring mechanism are separately arranged, the crankshaft supporting point is far away from the pump body measuring point, and the inclination of the workpiece has a greater influence on the measured value. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a cold press measuring device in which the distance between the supporting crankshaft point and the measuring point is relatively close.

[0004] The cold press measuring device of the present invention includes a measuring mechanism, which includes a lower pressure head, a base supporting the lower pressure head, a measuring needle placed in the lower pressure head and a displacement sensor for detecting the displacement of the measuring needle. The lower pressure head has a first through hole, the first through hole is open on the upper end surface of the lower pressure head, the measuring needle is arranged in the first through hole and its upper end extends out of the first through hole, a boss is provided on the upper end surface of the lower pressure head, and during measurement, the crankshaft is pressed on the boss higher than the upper end surface of the lower pressure head, and the compressor pump body is pressed on the measuring needle.

[0005] The measuring point of the cold press measuring device is close to the supporting point, and the tilt of the workpiece has little effect on the measured value; the supporting components of the measuring mechanism: the base and the lower pressure head are combined with the measuring components: the measuring needle and the displacement sensor, which reduces the number of parts and saves costs.

[0006] Preferably, a second through hole is provided in the base, the second through hole opens on the upper end surface of the base and is connected to the first through hole, the measuring mechanism also includes a piston placed in the second through hole, the lower end of the measuring needle stands on the upper end surface of the piston, and the lower end surface of the piston contacts the upper end of the displacement sensor.

[0007] A piston is added between the measuring needle and the displacement sensor to prevent the measuring needle from directly contacting the displacement sensor, thereby reducing the failure rate of the displacement sensor.

[0008] Preferably, the measuring mechanism also includes a spring and a limit ring placed in the second through hole, the spring is placed between the piston and the limit ring and is sleeved on the outside of the displacement sensor, and the lower end of the limit ring is placed on the step of the displacement sensor.

[0009] The addition of a spring and a limit ring limits the downward movement of the piston. When the spring is compressed to the limit, the range of the displacement sensor is not full, which protects the displacement sensor and increases its service life.

[0010] Preferably, the base further has a third through hole which is in communication with the lower end surface of the base and is coaxial with the second through hole, and the lower end of the displacement sensor is placed in the third through hole.

[0011] The third through hole is added to limit the swing amplitude of the lower end of the displacement sensor, thereby ensuring the measurement accuracy.

[0012] Preferably, it also includes a clamping seat located between the second through hole and the third through hole for fixing the displacement sensor.

[0013] The clamping seat fixes the displacement sensor to ensure the measurement accuracy of the sensor.

[0014] Compared with the prior art, the present invention has the following beneficial effects: a measuring assembly consisting of a measuring needle, a piston and a displacement sensor and a supporting assembly consisting of a base and a lower pressure head are assembled together to form a measuring mechanism; the measuring point (the pump body contacts the measuring needle) and the supporting point (the crankshaft is pressed on the boss of the lower pressure head) are close, and the tilted placement of the workpiece does not affect the measurement result; in addition, after the measuring assembly and the supporting assembly are combined, the number of parts is reduced, saving costs; a piston is added between the measuring needle and the displacement sensor to prevent the measuring needle from directly contacting the displacement sensor, thereby reducing the failure rate of the displacement sensor; the presence of the limit ring limits the downward movement distance of the piston, thereby protecting the displacement sensor and increasing the service life of the displacement sensor; the square clamping seat fixes the displacement sensor to ensure the measurement accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a cold press measuring device;

[0016] Figure 2 It is a cross-sectional view of a cold press measuring device;

[0017] Figure 3 for Figure 2 A partial view of

[0018] Figure 4 This is one of the structural diagrams of the lower pressure head;

[0019] Figure 5 This is the second structural diagram of the lower pressure head;

[0020] Figure 6 This is the structural diagram of the base;

[0021] Figure 7 It is an assembly drawing of a cold press measuring device and a crankshaft pump body;

[0022] Figure 8 One of the structural diagrams of the support mechanism 2;

[0023] Fig. 9 The second structural diagram of the support mechanism 2;

[0024] Fig.10 It is an assembly drawing of the crankshaft, pump body and support mechanism 2;

[0025] Fig.11 It is the structural diagram of the clamping mechanism;

[0026] Fig.12 This is the assembly drawing of the crankshaft and pump body;

[0027] Fig.13 This is a structural diagram of the crankshaft. DETAILED DESCRIPTION

[0028] A cold press measuring device comprises a measuring mechanism 1 and a supporting mechanism 2; the measuring mechanism 1 measures the downward displacement of a compressor pump body; the supporting mechanism 2 supports the measuring mechanism 1 and provides support for measuring different downward displacements of the compressor pump body.

[0029] <Measurement mechanism 1>

[0030] Figure 1 and Figure 2 They are respectively a stereoscopic view and a cross-sectional view of a measuring mechanism 1 of a cold press measuring device, Figure 3 yes Figure 2 In the partial enlarged view at I, the measuring mechanism 1 includes a pressing head 11, a measuring needle 12, a piston 13, a spring 14, a limiting ring 15, a clamping seat 16, a base 17 and a displacement sensor 18;

[0031] The boss 111 at the lower end of the pressing head 11 is placed in a groove 171 at the upper end of the base 17 that matches the boss 111. The base 17 supports the pressing head 11 from below, and the cooperation between the boss 111 and the groove 171 limits the horizontal displacement of the pressing head 11.

[0032] Figure 4 and Figure 5 is a structural diagram of the lower pressure head 11, Figure 6 The structural diagram of the base 17 is shown in FIG. The measuring needle 12 vertically passes through the vertical through hole 112 (the first through hole) on one side of the lower pressure head 11 and stands on the upper end surface of the circular piston 13; the piston 13, the spring 14, the limit ring 15 and the displacement sensor 18 are respectively placed in the through hole 172 (the second through hole) of the base 17 which is coaxial with the hole 112 (when assembled) and communicates with the upper end surface of the base 17 from top to bottom. The upper end of the spring sleeved on the outside of the upper end of the displacement sensor 18 supports the piston 13, and the lower end stands on the limit ring 15; the upper end of the displacement sensor 18 is built into the hole 151 of the limit ring 15 located at the lower end of the hole 172, and its lower end passes through the through hole 173 (the third through hole) located at the lower end of the base 17 and communicates with the lower end surface of the base 17 which is coaxial with the hole 172; the limit ring 15 is placed in the through hole 17 2, and a displacement sensor 18 is arranged inside the lower end of the clamping seat 16, the lower end of the limit ring 15 is placed on the upper end of the clamping seat 16, and the spring 14 is arranged between the lower end surface of the circular piston 13 and the upper end surface of the limit ring 15. Due to the existence of the rigidity of the spring itself, when the spring is compressed to the limit, the displacement sensor 18 has not reached the full range, which effectively increases the service life of the displacement sensor; the clamping seat 16 assembled between the through holes 172 and 173 is a rectangular parallelepiped in the assembled state, and a through hole 161 equal to the outer diameter of the displacement sensor 18 is arranged at its center position. When the clamping seat 16 is not assembled, it is two mutually matching rectangular parallelepipeds split along the diameter of the through hole 161. When assembled, the displacement sensor 18 is fixed in the through hole 161 to prevent the displacement sensor 18 from moving radially, and the two rectangular parallelepipeds are fixed together by bolts.

[0033] The measurement process of the measuring mechanism 1 is described below:

[0034] When in use, the base 17 is fixed on the supporting mechanism 2. Figure 7 It is an assembly drawing of a crankshaft, a compressor pump body and the compressor measuring mechanism 1. During measurement, the compressor crankshaft 4 and the pump body 5 move downward together under the action of the clamping mechanism, the fan surface 41 of the compressor crankshaft 4 contacts the boss 113 of the lower pressure head 11, and the lower end surface 51 of the compressor pump body 5 contacts the measuring needle 12. The clamping mechanism presses the measuring needle 12 downward, and the measuring needle 12 presses the piston 13. When the piston 13 presses the displacement sensor 18 downward, the spring 14 placed between the piston 13 and the limit ring 15 is also compressed by the piston 13. The displacement sensor 18 displays a reading under the pressure of the piston 13, and the measurement process is completed.

[0035] The measuring assembly consisting of the measuring needle, piston and displacement sensor and the supporting assembly consisting of the base and the pressure head are assembled together to form a measuring mechanism. The measuring point (the pump body contacts the measuring needle) is close to the supporting point (the crankshaft is pressed on the boss of the pressure head); a piston 13 is added between the measuring needle 12 and the displacement sensor 18 to avoid direct contact between the measuring needle 12 and the displacement sensor 18, thereby reducing the failure rate of the displacement sensor 18; the measuring needle 12 and the displacement sensor 18 can be purchased directly, and the structure is easy to clean. When the compressor type is changed, it is convenient to replace the measuring needle 12 of different lengths; the measuring assembly consisting of the measuring needle 12, piston 13 and displacement sensor 18 and the supporting assembly consisting of the base 12 and the pressure head 11 are assembled together, which reduces the number of workpieces and saves manufacturing costs. The distance between the supporting crankshaft point and the pressure head boss 113 is close to the measuring point, and the inclination of the workpiece has little effect on the measured value. This mechanism can be widely used in non-standard equipment for geometric precision measurement.

[0036] <Support mechanism 2>

[0037] Figure 8 and Fig. 9 is a structural diagram of the supporting mechanism 2, Fig.10 The support mechanism 2 is an assembly diagram of the crankshaft 4 and the pump body 5. The support mechanism 2 is installed on the base of the compressor rotor cold press, and includes a tooling plate positioning assembly 21, a steel plate assembly 22, a cylinder assembly 23, a linear bearing 24, an optical axis assembly 25, a floating cylinder assembly 26, a steel plate pad assembly 27 and a guide rail 28;

[0038] The tooling plate positioning assembly 21 includes two pins 211 and 212 respectively installed on the diagonal edges of the steel plate 221 (first steel plate). The pins 211 and 212 are respectively inserted into holes 2241 and 2242 on the tooling plate 226 placed above the steel plate to position the tooling plate 226.

[0039] The optical axes 251-254 are placed under the steel plate 221 and fixed thereto. At the same time, the optical axes 251-254 are respectively inserted into the linear bearings 241-244 installed on the steel plate 222 (the second steel plate) and move up and down in the linear bearings 241-244. The piston rods extending from the floating cylinders 261 and 262 installed on the steel plate 222 support the steel plate 221. The cylinders 261 and 262 are always ventilated, that is, they always maintain the state of supporting the steel plate 221. At this time, the cylinders 261 and 262 are used as gas springs.

[0040] When the crankshaft presses down the pressing head 11 installed on the steel plate 221, the four uprights supporting the steel plate 222 are not strong enough, and it is necessary to add steel plate pads 271 and 272 under the steel plate 222. The lifting steel plates 224 and 225 installed on both sides of the steel plate 222 are lifted up by the lifting cylinders 232 and 231 installed on the steel plate 223, respectively. After being lifted into place, the extension mechanisms of the steel plate pad cylinders 233 and 234 installed on both sides of the steel plate 223 (the third steel plate) push the steel plate pads 271 and 272, respectively. The steel plate pad 272 moves toward each other along the guide rails 281 and 282 and the steel plate pad 272 moves toward each other along the guide rails 283 and 284. When the steel plate pads 271 and 272 are both below the steel plate 222, the cylinders 233 and 234 stop working, the cylinders 231 and 232 work to retract the piston rods, and the steel plate 222 falls on the steel plate pads 271 and 272. In the process of the steel plate 222 being lifted up, the four optical axes 255-258 passing through the steel plate 222, standing on the steel plate 223 and bolted thereto, play a role in lifting up and guiding.

[0041] Fig.11 The clamping mechanism 3 shown is placed above the crankshaft 4 and the pump body 5, and is fixed to four columns (not shown) of the compressor rotor cold press through steel plates 343 and 344. When the extension mechanisms of the two clamping cylinders 311 and 312 press the pump body 5 downward through the pressing steel plates 341 and 342 respectively, the linear bearings 351-354 move downward along the four columns respectively;

[0042] The following is an explanation of the principle of measuring the gap between the lower end surface 51 of the pump body 5 and the fan surface 41 of the crankshaft 4:

[0043] When measuring, the crankshaft 4 and the pump body 5 are placed on the tooling plate 226, the extension mechanism of the clamping cylinders 311 and 312 presses down the steel plates 341 and 342, the steel plate 345 is fixedly connected to the steel plates 341 and 342, the clamping column assembly 35 is placed on the steel plate 345, the clamping seat 35 placed on the steel plate 345 supports the guide sleeve 32 to prevent it from falling, the four clamping columns 352 clamp the pump body 5, and the crankshaft 4 sleeved with the pump body 5 is also pressed on the boss 113 of the lower pressure head under the downward pressure of the pump body 5, the baffle 33 placed under the guide sleeve 32 is removed, and the rotor falls freely from the guide sleeve 32 to the crankshaft 4 coaxial therewith, and the upper pressure head (not shown) presses the rotor into the crankshaft, almost pressing the rotor into place , the displacement sensor 18 reads A0. At this time, there is an internal force of about 2000-5000N between the upper pressure head, the rotor, the crankshaft 4 and the lower pressure head 11, which are in a rigid state without relative motion. Then, the clamping cylinders 311 and 312 lift the extension mechanism. Since the cylinder diameters of the clamping cylinders 311 and 312 are larger than those of the cylinders 261 and 262, the extension mechanisms of the cylinders 261 and 262 push the steel plate 221 upward, the steel plate 221 pushes the tooling plate 226, and the tooling plate 226 pushes the pump body 5, causing the measuring needle 12 against the pump body 5 to move upward along the axial direction. The displacement sensor 18 reads A1 at this time, and the difference A0-A1 is the gap between the crankshaft sector 41 and the lower end face 51 of the pump body.

[0044] The above description is only a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the invention should be included in the protection scope of the invention.

[0045] For example, the square clamping seat above may also be in other shapes as long as it can achieve the clamping function.

Claims

1. A cold press measuring device, comprising a measuring mechanism, wherein the measuring mechanism comprises a pressing head, a base supporting the pressing head, a measuring needle placed in the pressing head, and a displacement sensor for detecting the displacement of the measuring needle, characterized in that: The pressing head has a first through hole therein, the first through hole is open at the upper end surface of the pressing head, the measuring needle is arranged in the first through hole and the upper end thereof extends out of the first through hole, A boss is provided on the upper end surface of the lower pressure head. During measurement, the crankshaft is pressed on the boss higher than the upper end surface of the lower pressure head, and the compressor pump body is pressed on the measuring needle; A second through hole is provided in the base, the second through hole opens at the upper end surface of the base and is connected to the first through hole, the first through hole is located on one side of the pressing head, and the second through hole is located on one side of the base; The measuring mechanism further comprises a piston placed in the second through hole, the lower end of the measuring needle stands on the upper end surface of the piston, and the lower end surface of the piston contacts the upper end of the displacement sensor. The measuring mechanism further comprises a spring and a limit ring placed in the second through hole, the spring is placed between the piston and the limit ring, and is sleeved on the outside of the displacement sensor, and the lower end of the limit ring is placed on the step of the displacement sensor; It also includes a supporting mechanism for supporting the measuring mechanism, wherein the supporting mechanism includes a steel plate assembly, a cylinder assembly, a linear bearing, an optical axis assembly, a floating cylinder assembly, a steel plate pad assembly, and a plurality of guide rails. Wherein, the steel plate assembly comprises: a first steel plate, a second steel plate located below the first steel plate, a third steel plate located below the second steel plate, and jacking steel plates installed on both sides of the second steel plate; The base is detachably fixed to the first steel plate, the cylinder assembly includes a plurality of cylinders, the linear bearing is arranged on the second steel plate, the optical axis assembly includes a plurality of optical axes, which are placed below the first steel plate and fixedly connected thereto, and the plurality of optical axes are respectively and correspondingly inserted into the linear bearings installed on the second steel plate, and move up and down in the linear bearings, the floating cylinder assembly is installed on the second steel plate, and the piston rod extending from the floating cylinder assembly supports the first steel plate; The lifting steel plate lifts up the second steel plate under the action of the cylinder for the second steel plate installed on the third steel plate. After lifting into place, the extension mechanisms of the cylinder for pushing the steel plate pads installed on the third steel plate push the steel plate pads to move toward each other along the guide rails. When the steel plate pads are all below the second steel plate, the cylinder for pushing the steel plate pads stops working, the cylinder for the second steel plate installed on the third steel plate works to retract the piston rod, and the second steel plate falls onto the steel plate pads. In the process of the second steel plate being lifted up, the multiple optical axes passing through the second steel plate, standing on the third steel plate and bolted to it, play a role in lifting and guiding.

2. The cold press measuring device according to claim 1, characterized in that: The base also has a third through hole which is communicated with the lower end surface of the base and is coaxial with the second through hole, and the lower end of the displacement sensor is placed in the third through hole.

3. The cold press measuring device according to claim 2, characterized in that: It also includes a clamping seat located between the second through hole and the third through hole for fixing the displacement sensor.

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