Top dead center measuring equipment

Abstract

The utility model relates to the technical field of compressor piston top dead center measurement, and discloses a top dead center measuring device which comprises a conveying line, a position adjusting device and a measuring device. The conveying line is used for conveying the crankcase; the position adjusting device is arranged on one side of the conveying line and used for pushing a crankshaft of the crankcase on the conveying line to move to a preset position, and then a piston is driven to move to a preset position where the piston does not extend out of the testing face of the crankcase. The measuring device is arranged on one side of the conveying line and used for detecting the distance between the piston top dead center of the crankcase on the conveying line and the testing face. The top dead center measuring equipment provided by the utility model can solve the problem of how to improve the measuring precision of the top dead center.

Description

Technical Field

[0001] This utility model relates to the field of compressor piston top dead center measurement technology, specifically to a top dead center measurement device. Background Technology

[0002] In the field of compressor design and manufacturing, precise control of piston movement and its coordination with surrounding structures are crucial. During the reciprocating motion of the compressor piston, its top dead center (the highest point of the piston stroke) typically extends beyond the crankcase surface. This characteristic necessitates that sufficient space be reserved between the crankcase surface and the cylinder head during compressor design to effectively prevent the piston from colliding with the cylinder head when reaching top dead center, thereby ensuring the stability and noise-free operation of the compressor.

[0003] In the prior art, a top dead center (TDC) testing device includes a clamping mechanism, a rotating mechanism, and a TDC measuring mechanism. The TDC measuring mechanism includes a test telescopic drive and a test head, with a displacement sensor recording the displacement data of the test head. During TDC testing, firstly, the clamping mechanism clamps the crankcase to prevent movement during the test. Then, the test telescopic drive drives the test head to press firmly against the test surface of the crankcase. At this point, the displacement sensor detects the first segment of displacement data, which serves as the initial reference point for subsequent calculations. Next, the rotating mechanism drives the crankcase rotor to rotate. The rotor, through the crankshaft, displaces the piston, extending it beyond the crankcase surface. The piston pushes the test head, causing displacement. At this point, the displacement sensor detects the second segment of displacement data. By calculating the difference between these two displacement data segments, the actual distance between the piston's TDC and the crankcase surface can be determined. However, this TDC testing device has a significant limitation in practical applications:

[0004] When measuring the first segment of displacement data, if the piston is extending beyond the crankcase test surface, the test head will not be able to directly contact the crankcase test surface due to piston interference. This results in the displacement sensor being unable to accurately record the displacement data of the initial reference point. In this situation, the measured top dead center distance is often less than the actual top dead center distance, thus affecting the accuracy and reliability of the test.

[0005] In view of the above limitations, it is necessary to improve the existing top dead center testing equipment and provide a new type of top dead center measuring device to improve its measurement accuracy. Utility Model Content

[0006] (1) Technical problems solved

[0007] This invention provides a top dead center measuring device, which can at least solve the technical problem of how to improve the measurement accuracy of the top dead center.

[0008] (2) Technical solution

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a top dead center measuring device, comprising:

[0010] Conveyor line, used to transport crankcases;

[0011] The position adjustment device is located on one side of the conveyor line and is used to push the crankshaft of the crankcase on the conveyor line to a preset position, thereby driving the piston to move to a preset position where it does not extend out of the test surface of the crankcase.

[0012] The measuring device is located on one side of the conveyor line and is used to detect the distance between the top dead center of the piston of the crankcase on the conveyor line and the test surface.

[0013] Further, the aforementioned position adjustment device includes a crankshaft alignment mechanism and a crankshaft straightening mechanism. The crankshaft alignment mechanism and the crankshaft straightening mechanism are sequentially arranged on one side of the conveyor line along the conveying direction of the conveyor line, and are both used to push the crankshaft of the crankcase on the conveyor line to a preset position.

[0014] Further, the aforementioned crankshaft alignment mechanism includes:

[0015] The pusher block has a pusher surface that is inclined outward from the rotor's axis. The pusher surface is used to abut against the crankshaft and guide the crankshaft's direction of movement.

[0016] The pusher drive is located on one side of the conveyor line and is connected to the pusher drive. The pusher drive is used to drive the pusher to move towards or away from the conveyor line.

[0017] Furthermore, the aforementioned crankshaft straightening mechanism includes:

[0018] The limiting block has a V-shaped opening.

[0019] The limit block drive is located on one side of the conveyor line and is connected to the limit block in a transmission manner. The limit block drive is used to drive the limit block to move towards or away from the conveyor line.

[0020] Further, the aforementioned measuring device includes:

[0021] A clamping mechanism is located above the conveyor line and is used to press the crankcase firmly against the conveyor line;

[0022] The rotary clamping mechanism can be raised and lowered below the conveyor line and is used to clamp or release the rotor of the crankcase, as well as drive the rotor to rotate.

[0023] The lifting mechanism is located below the conveyor line. The output end of the lifting mechanism is connected to the rotary clamping mechanism. The lifting mechanism is used to drive the rotary clamping mechanism to lift.

[0024] The measuring mechanism includes a telescopic drive and a test head. The telescopic drive is located on one side of the conveyor line and is connected to the test head via a transmission mechanism. The telescopic drive is used to drive the test head to move toward or away from the conveyor line.

[0025] Furthermore, the aforementioned rotary clamping mechanism includes:

[0026] A clamping drive and at least two annularly spaced clamping arms, wherein the clamping drive is kinetically connected to the at least two clamping arms and is used to drive the at least two clamping arms to move closer to or further away from each other in order to clamp or release the rotor.

[0027] The rotating mechanism is located at the output end of the lifting mechanism and is connected to the clamping drive component. The rotating mechanism is used to drive the clamping drive component to rotate, thereby driving the rotor to rotate.

[0028] Furthermore, the aforementioned measuring device is provided in at least two units, with each measuring device spaced apart along the conveying direction of the conveyor line.

[0029] (III) Beneficial Effects

[0030] Compared with the prior art, the top dead center measuring device provided by this utility model has the following advantages:

[0031] When using the top dead center (TDC) measuring device provided by this utility model, firstly, the conveyor line transports the crankcase to a position opposite to the position adjustment device; then, the position adjustment device pushes the crankshaft of the crankcase to a preset position, thereby moving the piston of the crankcase to a preset position where it does not protrude from the test surface of the crankcase; next, the conveyor line transports the crankcase to a position opposite to the measuring device; finally, the measuring device detects the distance between the top dead center of the crankcase piston and the test surface on the conveyor line. It can be seen that this TDC measuring device, through the cooperation of the position adjustment device and the conveyor line, can move the crankshaft of each crankcase to be tested to a preset position one by one, ensuring that the piston of the crankcase moves to a preset position where it does not protrude from the test surface of the crankcase before measuring the TDC. This effectively improves the consistency and accuracy of the TDC measurement. Attached Figure Description

[0032] Figure 1 This is a perspective view of the top dead center measuring device in the embodiment;

[0033] Figure 2 This is a top view of the position adjustment device in the embodiment;

[0034] Figure 3 This is a partial cross-sectional view of the measuring device in the embodiment.

[0035] Icon labels:

[0036] 1. Conveyor line;

[0037] 2. Position adjustment device; 21. Crankshaft straightening mechanism; 211. Push block; 2111. Push surface; 212. Push block drive component; 22. Crankshaft straightening mechanism; 221. Limit block; 2211. V-shaped opening; 222. Limit block drive component;

[0038] 3. Measuring device; 31. Clamping mechanism; 311. Clamping block; 312. Clamping block drive component; 32. Rotary clamping mechanism; 321. Rotation mechanism; 322. Clamping drive component; 323. Clamping arm; 33. Lifting mechanism; 34. Measuring mechanism; 341. Telescopic drive component; 342. Test head;

[0039] 4. Crankcase; 41. Rotor; 42. Crankshaft; 43. Piston; 44. Test surface. Detailed Implementation

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] This invention provides a top dead center measuring device to address the problem of how to improve the measurement accuracy of the top dead center.

[0042] The crankcase 4 includes a rotor 41, a crankshaft 42 and a piston 43. One end of the crankshaft 42 is eccentrically rotatably connected to the rotor 41, and the other end is rotatably connected to the piston 43. When the rotor 41 rotates, the crankshaft 42 can drive the piston 43 to move.

[0043] See Figure 1 As shown, Figure 1 This is a perspective view of the top dead center measuring device in the embodiment. The top dead center measuring device includes a conveyor line 1, a position adjustment device 2, and a measuring device 3.

[0044] Conveyor line 1 is used to transport crankcase 4.

[0045] The position adjustment device 2 is installed on one side of the conveyor line 1. The position adjustment device 2 is used to push the crankshaft 42 of the crankcase 4 on the conveyor line 1 to a preset position, thereby driving the piston 43 to move to a preset position where it does not extend out of the test surface 44 of the crankcase 4.

[0046] The measuring device 3 is installed on one side of the conveyor line 1. The measuring device 3 is used to detect the distance between the top dead center of the piston 43 of the crankcase 4 on the conveyor line 1 and the test surface 44.

[0047] When using the top dead center (TDC) measuring device described above, firstly, the conveyor line 1 transports the crankcase 4 to a position opposite to the position adjustment device 2; then, the position adjustment device 2 pushes the crankshaft 42 of the crankcase 4 to a preset position, thereby moving the piston 43 of the crankcase 4 to a preset position where it does not protrude from the test surface 44 of the crankcase 4; next, the conveyor line 1 transports the crankcase 4 to a position opposite to the measuring device 3; finally, the measuring device 3 detects the distance between the TDC of the piston 43 of the crankcase 4 on the conveyor line 1 and the test surface 44. It can be seen that this TDC measuring device, through the cooperation of the position adjustment device 2 and the conveyor line 1, can move the crankshaft 42 of each crankcase 4 to be tested to a preset position one by one, ensuring that the piston 43 of the crankcase 4 moves to the preset position where it does not protrude from the test surface 44 of the crankcase 4 before measuring the TDC. This effectively improves the consistency and accuracy of the TDC measurement.

[0048] The aforementioned conveyor line 1 can use existing conveyor belts, conveyor chains, or transplanting mechanisms to transport the crankcase 4.

[0049] See Figure 1 As shown, in one embodiment of the position adjustment device 2, the position adjustment device 2 includes a crankshaft alignment mechanism 21 and a crankshaft straightening mechanism 22. The crankshaft alignment mechanism 21 and the crankshaft straightening mechanism 22 are sequentially arranged on one side of the conveyor line 1 along the conveying direction of the conveyor line 1, and are both used to push the crankshaft 42 of the crankcase 4 on the conveyor line 1 to a preset position. It can be seen that both the crankshaft alignment mechanism 21 and the crankshaft straightening mechanism 22 can adjust the position of the crankshaft 42, so that the crankshaft 42 moves to the preset position. The crankshaft alignment mechanism 21 is located upstream and can initially push the crankshaft 42 to the preset position or near the preset position, while the crankshaft alignment mechanism 21 is located downstream and can finely adjust the position of the crankshaft 42 to ensure that the crankshaft 42 is accurately located in the preset position.

[0050] See Figure 1 and Figure 2 As shown, Figure 2This is a top view of the position adjustment device in one embodiment. In one implementation of the crankshaft alignment mechanism 21, the crankshaft alignment mechanism 21 includes a push block 211 and a push block drive member 212. The push block 211 has a push surface 2111, which is inclined outward from the axis of the rotor 41. The push surface 2111 is used to abut against the crankshaft 42 and guide the movement direction of the crankshaft 42. The push block drive member 212 is provided on one side of the conveyor line 1 by means of screwing or welding, and is drively connected to the push block 211. The push block drive member 212 is used to drive the push block 211 to move towards or away from the conveyor line 1. Thus, when the push block drive member 212 drives the push block 211 to move towards the conveyor line 1, the push surface 2111 of the push block 211 can abut against the crankshaft 42, and the push surface 2111 can guide the movement direction of the crankshaft 42 under the thrust of the push block 211, thereby enabling the crankshaft 42 to move to a preset position or near a preset position.

[0051] The aforementioned push block drive component 212 can use existing linear displacement drive mechanisms such as telescopic cylinders or telescopic poles. Its output end is connected to the push block 211 by means of screwing or welding. In this way, when the push block drive component 212 extends, the push block 211 can push the crankshaft 42 to a preset position or near the preset position. Conversely, when the push block drive component 212 shortens, the push block 211 can move away from the crankshaft 42 so that the crankcase 4 can be transported to the next station by the conveyor line 1.

[0052] Two crankshaft alignment mechanisms 21 can be provided. The push blocks 211 of the two crankshaft alignment mechanisms 21 are symmetrically arranged. By repeatedly pushing the crankshaft 42 to the preset position, the position adjustment effect can be more effectively ensured.

[0053] See Figure 1 and Figure 2 As shown, in one embodiment of the crankshaft straightening mechanism 22, the crankshaft straightening mechanism 22 includes a limiting block 221 and a limiting block drive member 222. The limiting block 221 has a V-shaped opening 2211. The limiting block drive member 222 is disposed on one side of the conveyor line 1 by means of screwing or welding, and is connected to the limiting block 221 in a transmission manner. The limiting block drive member 222 is used to drive the limiting block 221 to move toward or away from the conveyor line 1. It can be seen that when the limiting block drive member 222 drives the limiting block 221 to move toward the conveyor line 1, it can push the crankshaft 42 into the V-shaped opening 2211. The V-shaped opening 2211 is equivalent to being composed of the two symmetrical pushing surfaces 2111 mentioned above. It can not only guide the movement direction of the crankshaft 42, but also restrict the crankshaft 42 within the V-shaped opening 2211, thereby restricting the crankshaft 42 to a preset position.

[0054] The aforementioned limit block drive 222 can use existing linear displacement drive mechanisms such as telescopic cylinders or telescopic poles. Its output end is connected to the limit block 221 by screwing or welding. In this way, when the limit block drive 222 extends, the limit block 221 can push the crankshaft 42 into the V-shaped opening 2211. Conversely, when the limit block drive 222 shortens, the limit block 221 can move away from the crankshaft 42 so that the crankcase 4 can be transported to the next station by the conveyor line 1.

[0055] See Figure 1 and Figure 3 As shown, Figure 3 This is a partial cross-sectional view of the measuring device in one embodiment. The measuring device 3 includes a clamping mechanism 31, a rotary clamping mechanism 32, a lifting mechanism 33, and a measuring mechanism 34. The clamping mechanism 31 is positioned above the conveyor line 1 via screwing or welding, and is used to press the crankcase 4 firmly onto the conveyor line 1. The rotary clamping mechanism 32 is vertically movable below the conveyor line 1, and is used to clamp or release the rotor 41 of the crankcase 4, and to drive the rotor 41 to rotate. The lifting mechanism 33 is positioned below the conveyor line 1 via screwing or welding, and its output end is connected to the rotary clamping mechanism 32 via screwing or welding, and is used to drive the rotary clamping mechanism 32 to move vertically. The measuring mechanism 34 includes a telescopic drive component 341 and a test head 342, which is used to acquire displacement information. The telescopic drive component 341 is located on one side of the conveyor line 1 by means of screwing or welding, and is connected to the test head 342 for transmission. The telescopic drive component 341 is used to drive the test head 342 to move towards or away from the conveyor line 1. Thus, when the measuring device 3 is used, firstly, the clamping mechanism 31 presses the corresponding crankcase 4 tightly onto the conveyor line 1 to prevent the crankcase 4 from moving during the measurement process; then, the telescopic drive 341 drives the test head 342 to move towards the conveyor line 1 until it contacts the test surface 44 of the crankcase 4. At this time, the test head 342 detects the first segment of displacement data, which serves as the initial reference point for subsequent calculations; next, the lifting mechanism 33 drives the rotating clamping mechanism 32 to rise, which clamps the rotor 41 of the crankcase 4 and drives the rotor 41 to rotate. The rotor 41 drives the piston 43 to move out of the test surface 44 via the crankshaft 42, and the piston 43 pushes the test head 342 to move. At this time, the test head 342 detects the second segment of displacement data; finally, by calculating the difference between these two segments of displacement data, the actual distance between the top dead center of the piston 43 and the test surface 44 can be obtained.

[0056] The aforementioned lifting mechanism 33 can use existing linear displacement drive mechanisms such as telescopic cylinders or telescopic poles. Thus, the extension and retraction of the lifting mechanism 33 drives the lifting and retraction of the rotary clamping mechanism 32. The aforementioned test head 342 can use a test head 342 from the prior art. This test head 342 consists of a test housing, a probe spindle, a return spring, and a displacement sensor. The probe spindle is slidably mounted on the front end of the test housing, and the displacement sensor is located inside the test housing. During sliding movement, the probe spindle will contact the detection end of the displacement sensor. The return spring is located between the probe spindle and the displacement sensor. Under the elastic force of the return spring, the probe spindle tends to move away from the displacement sensor. Thus, by using the displacement sensor in conjunction with the probe spindle, the distance between the top dead center of the piston 43 and the test surface 44 can be detected.

[0057] See Figure 1 and Figure 3 As shown, in one embodiment of the pressing mechanism 31, the pressing mechanism 31 includes a pressing block 311 and a pressing block drive member 312. The pressing block drive member 312 can use existing linear displacement drive mechanisms such as telescopic cylinders or telescopic poles, and is set above the conveyor line 1 by means of screwing or welding. Its output end is connected to the pressing block 311 by means of screwing or welding. In this way, when the pressing block drive member 312 extends, it can drive the pressing block 311 to press down the crankcase 4 and press the crankcase 4 tightly on the conveyor line 1. Conversely, when the pressing block drive member 312 shortens, it can make the pressing block 311 rise and release the crankcase 4 so that the crankcase 4 can be conveyed to the next station by the conveyor line 1.

[0058] See Figure 3As shown, in one embodiment of the rotary clamping mechanism 32, the rotary clamping mechanism 32 includes a rotary mechanism 321, a clamping drive member 322, and at least two annularly spaced clamping arms 323. The clamping drive member 322 is operatively connected to the at least two clamping arms 323 and is used to drive the at least two clamping arms 323 to move closer or further apart to clamp or release the rotor 41. The rotary mechanism 321 is mounted on the output end of the lifting mechanism 33 by means of screwing or welding and is operatively connected to the clamping drive member 322. The rotary mechanism 321 is used to drive the clamping drive member 322 to rotate, thereby driving the rotor 41 to rotate. Thus, when the lifting mechanism 33 drives the rotating clamping mechanism 32 to rise, the clamping arms 323 are extended into the crankcase 4, so that the rotor 41 is located between at least two clamping arms 323. Then, the clamping drive 322 drives at least two clamping arms 323 to move closer to each other, thereby clamping the rotor 41. Finally, the rotating mechanism 321 drives the clamping drive 322 to rotate, thereby driving the rotor 41 to rotate. After the top dead center measurement is completed, the rotating mechanism 321 stops driving, and the clamping drive 322 drives at least two clamping arms 323 to move away from each other to release the rotor 41. Subsequently, the lifting mechanism 33 drives the rotating clamping mechanism 32 to descend so that the crankcase 4 can be transported to the next station by the conveyor line 1.

[0059] The aforementioned rotating mechanism 321 can use existing rotating drive mechanisms such as motors. The aforementioned clamping drive 322 can use existing gripper cylinders, and its output end is connected to at least two gripper arms 323 by means of screwing or welding.

[0060] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A top dead center measuring device, characterized in that, include: Conveyor line, used to transport crankcases; A position adjustment device is provided on one side of the conveyor line and is used to push the crankshaft of the crankcase on the conveyor line to a preset position, thereby driving the piston to move to a preset position where it does not extend out of the test surface of the crankcase. A measuring device is located on one side of the conveyor line and is used to detect the distance between the top dead center of the piston of the crankcase on the conveyor line and the test surface.

2. The top dead center measuring device according to claim 1, characterized in that, The position adjustment device includes a crankshaft alignment mechanism and a crankshaft straightening mechanism. The crankshaft alignment mechanism and the crankshaft straightening mechanism are sequentially arranged on one side of the conveyor line along the conveying direction of the conveyor line, and both are used to push the crankshaft of the crankcase on the conveyor line to a preset position.

3. The top dead center measuring device according to claim 2, characterized in that, The crankshaft realignment mechanism includes: A pusher block, wherein the pusher block is provided with a pusher surface, the pusher surface being inclined outward from the rotor shaft of the crankcase, the pusher surface being used to abut against the crankshaft and guide the movement direction of the crankshaft; A pusher drive is located on one side of the conveyor line and is connected to the pusher in a driving manner. The pusher drive is used to drive the pusher to move toward or away from the conveyor line.

4. The top dead center measuring device according to claim 2, characterized in that, The crankshaft straightening mechanism includes: A limiting block, wherein the limiting block is provided with a V-shaped opening; A limit block drive is disposed on one side of the conveyor line and is connected to the limit block in a transmission manner. The limit block drive is used to drive the limit block to move toward or away from the conveyor line.

5. The top dead center measuring device according to any one of claims 1-4, characterized in that, The measuring device includes: A clamping mechanism is located above the conveyor line and is used to press the crankcase tightly against the conveyor line; A rotary clamping mechanism is vertically mounted below the conveyor line and is used to clamp or release the rotor of the crankcase, as well as drive the rotor to rotate. A lifting mechanism is located below the conveyor line. The output end of the lifting mechanism is connected to the rotary clamping mechanism. The lifting mechanism is used to drive the rotary clamping mechanism to move up and down. The measuring mechanism includes a telescopic drive and a test head. The telescopic drive is located on one side of the conveyor line and is connected to the test head in a transmission manner. The telescopic drive is used to drive the test head to move toward or away from the conveyor line.

6. The top dead center measuring device according to claim 5, characterized in that, The rotary clamping mechanism includes: A clamping drive and at least two annularly spaced clamping arms, the clamping drive being kinetically connected to the at least two clamping arms and used to drive the at least two clamping arms to move closer or further apart from each other in order to clamp or release the rotor; A rotating mechanism is located at the output end of the lifting mechanism and is connected to the clamping drive component. The rotating mechanism is used to drive the clamping drive component to rotate, thereby driving the rotor to rotate.

7. The top dead center measuring device according to any one of claims 1, 2, 3, 4 and 6, characterized in that, The measuring device is provided in at least two parts, and each measuring device is arranged at intervals along the conveying direction of the conveyor line.

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