A measurement calibrator for mechanical instruments

Abstract

The invention discloses a metrological calibrator for a mechanical instrument, which belongs to the technical field of mechanical instruments. By means of a connecting mechanism, a rotating mechanism and a switching mechanism, when a calibration spring needs to be replaced, a dial block is turned in the opposite direction to rotate the installation chamber out from inside a first half shell and a second half shell, and then the adjusting rod is turned to rotate the inner chamber in the installation chamber, and the inner chamber drives a calibration spring that meets the requirements to rotate to a combined channel, and then the installation chamber is turned into the first half shell, and the calibration spring is rotated to between the first rotating rod and the hanging part. At this time, the engaging parts on both sides of the calibration spring are embedded in an engaging groove provided inside the connecting part under the guidance of the embedding channel. Since the two engaging parts cannot be moved out of the embedding groove by vertical movement, and the stretching of the calibration spring is vertical stretching, the position of the calibration spring is restricted at this time, and the replacement of the calibration spring is completed, thereby achieving rapid replacement of the calibration spring as needed, so that it can adapt to the calibration operation of weights of different weights.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical instruments, and in particular to a measurement calibrator for mechanical instruments. Background Art

[0002] Mechanical instruments refer to those instruments or equipments specially used to measure, observe, analyze and record mechanical quantities (such as force, mass, displacement, velocity, acceleration, stress, strain, torque, etc.). There are many kinds of mechanical instruments, among which scales and balances are mechanical instruments used to measure the mass of objects, and are one of the most basic measuring tools in mechanics. Weights are objects used with scales and balances to measure the mass of objects. Their mass is usually known and is used to compare with the measured object on the scale or balance to determine the mass of the measured object. Although its function is relatively simple, it is indispensable in mechanical measurement.

[0003] The calibration of weights is an important step to ensure the accuracy of weight mass, which is crucial to improving measurement accuracy and reliability. The existing calibration operation is to select a known accurate weighing instrument as a calibration tool, and place the weights to be calibrated on the balance or weighing instrument for initial weighing, record the measured weighing values, and compare these weighing values ​​with the standard mass values ​​of the weights to calculate the initial error;

[0004] Among them, the calibration threshold of non-electronic weighing instruments using springs is generally related to the spring's stiffness coefficient, which determines the degree of deformation that a spring can produce when subjected to a certain force. Therefore, the calibration threshold of a spring weighing instrument must be less than the elastic limit of its spring to ensure the accuracy of the measurement and the safety of the instrument.

[0005] However, in actual use, weights in different weight ranges cannot be tested using the same spring scale. When the elastic limit of the installed spring is large, a small weight may not be able to deform the spring. When the elastic limit of the installed spring is small, a large weight will cause the spring to undergo plastic deformation and be unable to return to its original state. Therefore, it is necessary to prepare multiple spring scales according to the calibrated weights, which is inconvenient to operate. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that weights in different weight ranges cannot be tested using the same spring weighing instrument. When the elastic limit of the installed spring is large, the weight of a small weight may not be able to deform the spring, and when the elastic limit of the installed spring is small, the weight of a large weight will cause the spring to undergo plastic deformation and be unable to return to its original state. Therefore, it is necessary to prepare multiple spring weighing instruments according to the weight of the calibrated weights, which is inconvenient to operate. A measurement calibrator for a mechanical instrument is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technology: a measurement calibrator for mechanical instruments:

[0008] The calibrator shell includes a first half shell and a second half shell interlocked with the first half shell, a scale is arranged on the first half shell, a calibration mechanism is arranged in a chamber formed by the first half shell and the second half shell, the calibration mechanism includes a first rotating rod rotatably arranged and a hanging member arranged on the second half shell, and a calibration spring is arranged between the hanging member and the first rotating rod;

[0009] A lifting and lowering holder is provided in the first half shell, and a placing table for placing weights is provided on the top of the holder. When the holder descends, it pushes the first rotating rod to rotate and pulls the calibration spring to elastically deform.

[0010] The calibration spring is replaced by a switching mechanism, which includes an installation chamber arranged in the first half shell and an inner cavity rotatably arranged inside the installation chamber. At least two calibration springs are installed inside the inner cavity. Any calibration spring can rotate with the inner cavity to between the first rotating rod and the hanging part, and be connected through a connecting mechanism arranged at both ends of the calibration spring.

[0011] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0012] The calibration mechanism also includes a bracket arranged in the second half shell, on which a first rotating shaft and a second rotating shaft are rotatably arranged respectively, and a first rotating rod is sleeved on the surface of the first rotating shaft, and a second rotating rod is sleeved on the surface of the second rotating shaft;

[0013] The two ends of the retaining frame are respectively hingedly arranged at the middle of the first rotating rod and the end of the second rotating rod, and when the retaining frame descends, the first rotating rod and the second rotating rod rotate respectively around the first rotating shaft and the second rotating shaft;

[0014] A pointer is arranged at the end of the first rotating rod, and when the weight is placed on the placing table, the pointer rotates to cooperate with the scale to obtain data.

[0015] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0016] The first rotating rod is provided with a sliding groove, and a sliding platform is slidably arranged inside the sliding groove, a hinge shaft is arranged on the sliding platform, and a connecting plug-in is rotatably hinged on the hinge shaft, and a connecting mechanism is arranged on the connecting plug-in;

[0017] The hinge shaft is provided with a torsion spring, and two ends of the torsion spring are respectively connected to the hinge shaft and the connecting plug-in.

[0018] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0019] The end of the hanging piece and the connecting plug-in are both connected with a connecting mechanism, the connecting mechanism includes a connecting slot connected to the hanging piece and the connecting plug-in, and a connecting piece is arranged on the connecting slot, an embedding groove is provided inside the connecting piece, and an embedding channel is provided at the top of the embedding groove;

[0020] Both ends of the calibration spring are provided with engaging parts, and the engaging parts can be guided by the embedding channel to be embedded in the embedding groove for connection.

[0021] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0022] A magnet is arranged at the center of the connecting piece, and the magnet can attract the metal fitting embedded in the fitting groove by magnetic force.

[0023] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0024] The switching mechanism is rotatably mounted on the first half shell through a rotating mechanism, the rotating mechanism includes two first rotating grooves provided on the first half shell, and rotating rods are rotatably embedded in the two first rotating grooves, a sleeve rod is sleeved and mounted on the surface of the rotating rod, and the sleeve rod is connected to the outer wall of the mounting chamber, and a shifting block is mounted on the outer wall of the sleeve rod;

[0025] The outer wall of the first half shell is provided with a through hole for the installation chamber to rotate into.

[0026] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0027] The top of the installation chamber is provided with an arc-shaped combined channel, and the center position of the combined channel is the same as the center position of the connecting piece. When the installation chamber rotates with the sleeve rod as the axis, the inner cavity drives the fittings arranged at both ends of the calibration spring to move along an arc track and embed into the fitting groove;

[0028] A clamping piece is provided at the top of the inner cavity, and guide grooves are provided on both sides of the clamping piece. A clamping groove cooperating with the clamping piece is provided on the upper end engaging piece of the calibration spring, and guide rails engaged with the guide grooves are provided on both sides of the inner wall of the clamping groove.

[0029] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0030] The inner cavity is rotatably arranged in the installation cavity through an adjusting mechanism. The adjusting mechanism includes a second rotating groove opened at the bottom of the installation cavity and an adjusting rod rotatably arranged in the second rotating groove and passing through the middle of the inner cavity. When the adjusting rod rotates, the inner cavity rotates in the installation cavity. An inspection hole for observing the rotation of the inner cavity is opened at the top of the installation cavity.

[0031] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0032] The adjusting rod is provided with a plurality of latch slots equidistantly around the adjusting rod, and a latch is provided through the middle of the latch slot, and the latch slot and the latch are connected by a compression spring;

[0033] A plurality of slots cooperating with the latch pins are equidistantly arranged around the inner wall of the second rotating groove, and the side walls on both sides of the slots are arranged to be inclined.

[0034] Further description of the metrological calibrator as a mechanical instrument of the above technology:

[0035] The second rotating shaft is provided with a polygonal positioning groove, and a positioning pin can be inserted into the positioning groove;

[0036] The second half shell is provided with a sliding groove, and a sliding rod is slidably embedded in the sliding groove, and the end of the sliding rod is connected with the positioning pin.

[0037] In summary, due to the use of the above-mentioned technology, the calibrator for measuring mechanical instruments has the following beneficial effects:

[0038] 1. Through the calibration mechanism, when the weight needs to be calibrated, the weight is placed on the placement table. At this time, under the downward pressure of the weight, the placement table drives the retaining frame to descend and pulls the second rotating rod and the first rotating rod to rotate with the second rotating shaft and the first rotating shaft as the axis respectively. At this time, the slide set on the first rotating rod pulls the calibration spring through the hinge shaft and the connecting plug-in, and the calibration spring produces elastic deformation. It should be noted that at this time, as the first rotating rod rotates, the calibration spring will also reversely pull the slide through the connecting plug-in and the hinge shaft to slide inside the slide slot to adjust the position, thereby achieving the purpose of ensuring that the calibration spring can always maintain a vertical state. At the same time, the first rotating rod drives the pointer to rotate. After waiting for the rotation to stop, the weight data of the weight can be obtained by cooperating with the position of the scale through the pointer;

[0039] 2. Through the provided connecting mechanism, rotating mechanism and switching mechanism, when the calibration spring needs to be replaced, the installation chamber is rotated out from the inside of the first half shell and the second half shell by reversely shifting the dial block, and then the adjusting rod is rotated to make the adjusting rod drive the inner chamber to rotate in the installation chamber, and the inner chamber drives the calibration spring that meets the requirements to rotate to the combined channel, and then the installation chamber is rotated into the first half shell and the second half shell. In the process of the calibration spring rotating to between the first rotating rod and the hanging part, the engaging parts on both sides of the calibration spring are embedded in the engaging grooves opened in the connecting part under the guidance of the embedding channel. Since the two engaging parts cannot be moved out of the embedding grooves by vertical movement, and the stretching of the calibration spring is vertical stretching, the position of the calibration spring is restricted at this time, and the replacement of the calibration spring is completed, so as to achieve the rapid replacement of the calibration spring as needed, so that it can adapt to the calibration operation of weights of different weights, thereby improving the convenience and adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the three-dimensional structure of a measurement calibrator for a mechanical instrument provided in an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram of a first three-dimensional cross-sectional structure of a measurement calibrator for a mechanical instrument provided in an embodiment of the present invention is shown;

[0042] Figure 3 A second three-dimensional cross-sectional structural schematic diagram of a measurement calibrator for a mechanical instrument provided in an embodiment of the present invention is shown;

[0043] Figure 4 A schematic diagram of the three-dimensional structure of a calibration mechanism provided according to an embodiment of the present invention is shown;

[0044] Figure 5 The embodiment of the present invention provides Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0045] Figure 6 A partial three-dimensional structural schematic diagram of a connecting mechanism provided according to an embodiment of the present invention is shown;

[0046] Figure 7 A schematic diagram of the three-dimensional structure of a calibration spring and an engaging member provided according to an embodiment of the present invention is shown;

[0047] Figure 8 A schematic diagram of a three-dimensional structure in which the installation chamber provided by an embodiment of the present invention is rotated out of the calibrator housing through a rotating mechanism is shown;

[0048] Fig. 9 A schematic diagram of the three-dimensional structure of a switching mechanism provided according to an embodiment of the present invention is shown;

[0049] Fig.10 A schematic diagram of the three-dimensional structure of an inner cavity provided according to an embodiment of the present invention is shown;

[0050] Fig.11 A schematic diagram showing the connection state of a calibration spring in a switching mechanism provided in an embodiment of the present invention is shown;

[0051] Fig.12 The embodiment of the present invention provides Fig.11 A schematic diagram of the enlarged structure at B in the middle;

[0052] Fig.13 The embodiment of the present invention provides Fig.11 Schematic diagram of the enlarged structure at C in the middle;

[0053] Fig.14A schematic diagram of a top cross-sectional structure of a switching mechanism and an adjusting mechanism provided according to an embodiment of the present invention is shown;

[0054] Fig.15 The embodiment of the present invention provides Fig.14 Schematic diagram of the enlarged structure at D in the middle;

[0055] Fig.16 A schematic diagram of a top-view cross-sectional structure of a measurement calibrator for a mechanical instrument provided in an embodiment of the present invention is shown;

[0056] Fig.17 The embodiment of the present invention provides Fig.16 Schematic diagram of the enlarged structure at E in the middle.

[0057] Legend:

[0058] 10. Calibrator housing; 11. First half shell; 111. Through hole; 12. Second half shell; 13. Scale;

[0059] 20. calibration mechanism; 21. bracket; 22. first rotating shaft; 23. first rotating rod; 231. slide groove; 232. slide table; 233. hinge shaft; 234. connecting plug; 235. pointer; 24. second rotating shaft; 241. positioning groove; 242. positioning pin; 243. sliding groove; 244. sliding rod; 25. second rotating rod; 26. retaining frame; 27. hanging piece; 28. calibration spring; 29. ​​placing table;

[0060] 30. Connecting mechanism; 31. Connecting slot; 32. Connecting piece; 33. Fitting groove; 34. Embedding channel; 35. Magnet; 36. Fitting piece; 361. Snap-in groove; 362. Guide rail;

[0061] 40. Rotation mechanism; 41. First rotation slot; 42. Rotation rod; 43. Sleeve rod; 44. Dial block;

[0062] 50. Switching mechanism; 51. Installation chamber; 52. Combination channel; 53. Inspection hole; 54. Inner cavity; 55. Snap-on; 551. Guide groove;

[0063] 60. Adjusting mechanism; 61. Second rotating groove; 62. Adjusting rod; 63. Latch groove; 64. Latch; 65. Compression spring; 66. Slot. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technology in the embodiments of the present invention, a measurement calibrator for mechanical instruments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] In order to solve the problem that weights in different weight ranges cannot be tested using the same spring weighing instrument, when the elastic limit of the installed spring is large, a small weight may not be able to deform the spring, and when the elastic limit of the installed spring is small, a large weight will cause the spring to undergo plastic deformation and cannot be restored to its original state. Therefore, it is necessary to prepare multiple spring weighing instruments according to the weight of the calibrated weights, which is inconvenient to operate. The present invention proposes a measurement calibrator for mechanical instruments, such as Figure 1 - Fig.17 As shown:

[0066] The calibrator housing 10 includes a first half shell 11 and a second half shell 12 interlocked with the first half shell 11, a scale 13 is arranged on the first half shell 11, a calibration mechanism 20 is arranged in a chamber formed by the first half shell 11 and the second half shell 12, the calibration mechanism 20 includes a first rotating rod 23 rotatably arranged and a hanging member 27 arranged on the second half shell 12, and a calibration spring 28 is arranged between the hanging member 27 and the first rotating rod 23;

[0067] A lifting and lowering holder 26 is disposed in the first half shell 11, and a placing table 29 for placing weights is disposed on the top of the holder 26. When the holder 26 descends, it pushes the first rotating rod 23 to rotate and pulls the calibration spring 28 to elastically deform.

[0068] The calibration mechanism 20 further includes a bracket 21 disposed in the second half shell 12, on which a first rotating shaft 22 and a second rotating shaft 24 are rotatably disposed, respectively, and a first rotating rod 23 is sleeved on the surface of the first rotating shaft 22, and a second rotating rod 25 is sleeved on the surface of the second rotating shaft 24;

[0069] The two ends of the retaining frame 26 are respectively hingedly arranged at the middle of the first rotating rod 23 and the end of the second rotating rod 25. When the retaining frame 26 descends, the first rotating rod 23 and the second rotating rod 25 rotate respectively around the first rotating shaft 22 and the second rotating shaft 24. Through this design, the connecting plug 234 can always maintain a vertical state under the pulling of the torsion spring when it is not pulled by external force.

[0070] The first rotating rod 23 is provided with a slide groove 231, and a slide table 232 is slidably provided inside the slide groove 231, and a hinge shaft 233 is provided on the slide table 232, and a connecting plug 234 is rotatably hinged on the hinge shaft 233, and a connecting mechanism 30 is provided on the connecting plug 234;

[0071] The hinge shaft 233 is provided with a torsion spring, and the two ends of the torsion spring are respectively connected to the hinge shaft 233 and the connecting plug 234;

[0072] A pointer 235 is provided at the end of the first rotating rod 23;

[0073] When the weight needs to be calibrated, the weight is placed on the placement table 29. At this time, under the downward pressure of the weight, the placement table 29 drives the retaining frame 26 to descend and pulls the second rotating rod 25 and the first rotating rod 23 to rotate with the second rotating shaft 24 and the first rotating shaft 22 as the axis respectively. At this time, the slide 232 slidably arranged on the first rotating rod 23 pulls the calibration spring 28 through the hinge shaft 233 and the connecting plug 234, and the calibration spring 28 produces elastic deformation. It should be noted that at this time, as the first rotating rod 23 rotates, the calibration spring 28 will also reversely pull the slide 232 through the connecting plug 234 and the hinge shaft 233 to slide inside the slide groove 231 to adjust the position, thereby achieving the purpose of ensuring that the calibration spring 28 can always maintain a vertical state;

[0074] At the same time, the first rotating rod 23 drives the pointer 235 to rotate. After the rotation stops, the weight data of the weight can be obtained by cooperating with the position of the pointer 235 through the scale 13.

[0075] like Figure 1 and Figure 8 As shown, a rotating mechanism 40 is installed on the first half shell 11, and the rotating mechanism 40 includes two first rotating grooves 41 opened on the first half shell 11, and a rotating rod 42 is rotatably embedded inside the two first rotating grooves 41, and a sleeve rod 43 is sleeved and installed on the surface of the rotating rod 42, and the sleeve rod 43 is connected to the switching mechanism 50, and a shift block 44 is installed on the outer wall of the sleeve rod 43;

[0076] The switching mechanism 50 includes an installation chamber 51 disposed in the first half shell 11 and an inner chamber 54 rotatably disposed inside the installation chamber 51. At least two calibration springs 28 are installed inside the inner chamber 54. Any calibration spring 28 can rotate with the inner chamber 54 to between the first rotating rod 23 and the hanging member 27.

[0077] The outer wall of the first half shell 11 is provided with a through hole 111 for the installation chamber 51 to rotate into;

[0078] When the calibration spring 28 needs to be rotated to between the hanging member 27 and the first rotating rod 23 for installation, the shifting block 44 is shifted so that the shifting block 44 drives the rotating rod 42 to rotate under the restriction of the first rotating grooves 41 on both sides through the sleeve rod 43, and the installation chamber 51 can rotate accordingly and enter the first half shell 11 through the through hole 111. After the installation chamber 51 drives the calibration spring 28 to the specified position through the inner cavity 54, it is connected to the first rotating rod 23 and the hanging member 27 through the connecting mechanism 30;

[0079] like Figure 6 , Figure 7 , Fig.12 and Fig.13 As shown, the connection mechanism 30 includes a connection slot 31 connected to the hanging member 27 and the connection plug-in 234, and a connection member 32 is provided on the connection slot 31, an embedding groove 33 is provided inside the connection member 32, and an embedding channel 34 is provided at the top of the embedding groove 33;

[0080] Both ends of the calibration spring 28 are provided with an insert 36, and the insert 36 can be guided by the insert channel 34 to insert into the insert groove 33 for connection;

[0081] At the same time, if Fig.10 As shown, an arc-shaped combined channel 52 is opened on the top of the installation chamber 51, and the center position of the combined channel 52 is the same as the center position of the connecting member 32. When the installation chamber 51 rotates with the sleeve rod 43 as the axis, the inner cavity 54 drives the fittings 36 provided at both ends of the calibration spring 28 to move along an arc track and embed into the fitting groove 33;

[0082] A clamping piece 55 is provided at the top of the inner cavity 54, and guide grooves 551 are provided on both sides of the clamping piece 55. A clamping groove 361 cooperating with the clamping piece 55 is provided on the engaging piece 36 at the upper end of the calibration spring 28, and guide rails 362 engaging with the guide groove 551 are provided on both sides of the inner wall of the clamping groove 361. Through this design, multiple calibration springs 28 can be installed in the grooves provided on the surface of the inner cavity 54 in sequence. By moving the calibration spring 28, the calibration spring 28 enters the inner cavity 54 and drives the engaging piece 36 to be sleeved on the clamping piece 55. The clamping groove 361 is sleeved on the clamping piece 55, and the clamping groove 361 is embedded in the guide groove 551. Even if other calibration springs 28 are not connected to the connecting piece 32 through the engaging piece 36, they can remain in the inner cavity 54 waiting for use.

[0083] When the calibration spring 28 rotates between the first rotating rod 23 and the hanging member 27, the fitting members 36 on both sides are inserted into the fitting grooves 33 provided inside the connecting member 32 under the guidance of the inserting channel 34. It should be noted that the connecting member 32 provided on the hanging member 27 and the connecting member 32 connected by the connecting plug 234 are both in a vertical state, so as to ensure that the fitting member 36 can be accurately inserted into the fitting groove 33.

[0084] At this time, since the two interlocking parts 36 cannot be removed from the interlocking groove 33 by vertical movement, and the stretching of the calibration spring 28 is vertical stretching, the position of the calibration spring 28 is restricted at this time. In order to further improve the fixing effect of the interlocking part 36, a magnet 35 is provided at the center of the connecting part 32. The magnet 35 can use magnetic attraction to attract the metal interlocking part 36 embedded in the interlocking groove 33, and the connection between the interlocking part 36 entering the interlocking groove 33 and the connecting part 32 is tighter.

[0085] When the calibration spring 28 needs to be replaced, the dial block 44 is reversely moved to rotate the installation chamber 51 out of the first half shell 11 and the second half shell 12, and the adjustment mechanism 60 is rotated, such as Fig.14 and Fig.15 As shown, the inner cavity 54 is rotatably arranged in the installation cavity 51 through an adjusting mechanism 60. The adjusting mechanism 60 includes a second rotating groove 61 provided at the bottom of the installation cavity 51 and an adjusting rod 62 rotatably arranged in the second rotating groove 61 and penetrating the middle of the inner cavity 54. By rotating the adjusting rod 62, the adjusting rod 62 drives the inner cavity 54 to rotate in the installation cavity 51, and the inner cavity 54 drives the calibration spring 28 that meets the requirements to rotate to the combination channel 52, and then the installation cavity 51 is transferred into the first half shell 11 and the second half shell 12, so as to achieve the rapid replacement of the calibration spring 28 as needed, so that it can adapt to the calibration operation of weights of different weights, thereby improving the convenience and adaptability of the device. An inspection hole 53 for observing the rotation of the inner cavity 54 is provided on the top of the installation cavity 51 to observe the positions of other calibration springs 28 with different elastic limits;

[0086] At the same time, in order to fix the position of the inner cavity 54 after rotation, a plurality of latch grooves 63 are equidistantly arranged around the adjusting rod 62, and a latch 64 is arranged through the middle of the latch groove 63, and the latch groove 63 and the latch 64 are connected by a compression spring 65;

[0087] The inner wall of the second rotation groove 61 is equidistantly provided with a plurality of slots 66 cooperating with the latch 64, and the side walls of the slots 66 are arranged in an inclined shape;

[0088] When the adjusting rod 62 drives the inner cavity 54 to rotate, the adjusting rod 62 drives the latch 64 to rotate out of the slot 66. During the rotation process, the end of the latch 64 contacts the inclined surface of the slot 66, and the latch 64 moves into the latch slot 63 under the extrusion of the slot 66 and squeezes the compression spring 65. The compression spring 65 produces elastic deformation and the latch 64 is retracted into the latch slot 63. When the adjusting rod 62 rotates a certain angle, the latch 64 pops out from the latch slot 63 and is inserted into other slots 66 under the push of the elastic deformation recovery of the compression spring 65. The latch 64 re-coordinates with the slot 66 to fix the position of the adjusting rod 62 and the inner cavity 54. Since the calibration spring 28 will also limit the position of the inner cavity 54 after installation is completed, the coordination and fixing effect of the latch 64 and the slot 66 is sufficient to ensure that the inner cavity 54 will not rotate due to inertia when the installation chamber 51 rotates.

[0089] During the process of replacing the calibration spring 28, the first rotating rod 23 will temporarily lose the support of the calibration spring 28 and rotate under the action of gravity to a position in contact with the bottom of the inner wall of the first half shell 11 and the second half shell 12. At this time, the position of the connecting piece 32 provided on the first rotating rod 23 changes, which will make it impossible to install the calibration spring 28. In order to avoid this situation, Fig.16 and Fig.17 As shown, a positioning groove 241 is formed on the second rotating shaft 24, and a positioning pin 242 can be inserted into the positioning groove 241;

[0090] A polygonal sliding groove 243 is formed on the second half shell 12, and a sliding rod 244 is slidably embedded in the sliding groove 243, and the end of the sliding rod 244 is connected to the positioning pin 242;

[0091] Before replacing the calibration spring 28, the sliding rod 244 can be pushed so that the sliding rod 244 drives the positioning pin 242 to slide into the positioning groove 241 under the guidance of the sliding groove 243. Since the second rotating shaft 24 cannot rotate, the second rotating rod 25 can limit the position of the first rotating rod 23 through the retaining frame 26, so that it cannot rotate until the new calibration spring 28 is installed. The positioning pin 242 can be pulled out of the positioning groove 241 to release the restriction on the rotation of the second rotating rod 25.

[0092] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to a measuring calibrator of a mechanical instrument and its inventive concept according to the technology of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A measurement calibrator for a mechanical instrument, comprising a calibrator housing (10), the calibrator housing (10) comprising a first half shell (11) and a second half shell (12) interlocked with the first half shell (11), a scale (13) being arranged on the first half shell (11), characterized in that: A calibration mechanism (20) is arranged in the chamber formed by the first half shell (11) and the second half shell (12), the calibration mechanism (20) comprising a rotatably arranged first rotating rod (23) and a hanging member (27) arranged on the second half shell (12), and a calibration spring (28) is arranged between the hanging member (27) and the first rotating rod (23); A lifting and lowering retaining frame (26) is arranged in the first half shell (11), and a placing table (29) for placing weights is arranged on the top of the retaining frame (26); when the retaining frame (26) descends, it pushes the first rotating rod (23) to rotate and pulls the calibration spring (28) to elastically deform; The calibration mechanism (20) further comprises a bracket (21) arranged in the second half shell (12), a first rotating shaft (22) and a second rotating shaft (24) being rotatably arranged on the bracket (21), a first rotating rod (23) being sleeved on the surface of the first rotating shaft (22), and a second rotating rod (25) being sleeved on the surface of the second rotating shaft (24); The two ends of the retaining frame (26) are respectively hingedly arranged at the middle of the first rotating rod (23) and the end of the second rotating rod (25); when the retaining frame (26) descends, the first rotating rod (23) and the second rotating rod (25) respectively rotate about the first rotating shaft (22) and the second rotating shaft (24); A pointer (235) is provided at the end of the first rotating rod (23), and when the weight is placed on the placement table (29), the pointer (235) rotates in conjunction with the scale (13) to obtain data; The calibration spring (28) is replaced by a switching mechanism (50), the switching mechanism (50) comprising an installation chamber (51) arranged in the first half shell (11) and an inner chamber (54) rotatably arranged inside the installation chamber (51), at least two calibration springs (28) are installed inside the inner chamber (54), and any calibration spring (28) can be rotated with the inner chamber (54) to between the first rotating rod (23) and the hanging member (27), and connected via a connecting mechanism (30) arranged at both ends of the calibration spring (28).

2. A mechanical instrument measurement calibrator according to claim 1, characterized in that: The first rotating rod (23) is provided with a sliding groove (231), and a sliding platform (232) is slidably arranged inside the sliding groove (231), a hinge shaft (233) is arranged on the sliding platform (232), and a connecting plug-in (234) is rotatably hinged on the hinge shaft (233), and a connecting mechanism (30) is arranged on the connecting plug-in (234); The hinge shaft (233) is provided with a torsion spring, and two ends of the torsion spring are respectively connected to the hinge shaft (233) and the connecting plug-in unit (234).

3. A mechanical instrument measurement calibrator according to claim 2, characterized in that: The end of the hanging member (27) and the connecting plug-in (234) are both connected to a connecting mechanism (30), the connecting mechanism (30) comprising a connecting slot (31) connected to the hanging member (27) and the connecting plug-in (234), a connecting member (32) being provided on the connecting slot (31), an engaging groove (33) being provided inside the connecting member (32), and an embedding channel (34) being provided at the top of the engaging groove (33); Both ends of the calibration spring (28) are provided with engaging parts (36), and the engaging parts (36) can be guided by the embedding channel (34) to be embedded in the embedding groove (33) for connection.

4. A mechanical instrument measurement calibrator according to claim 3, characterized in that: A magnet (35) is provided at the center of the interior of the connecting piece (32), and the magnet (35) can attract the metal fitting piece (36) embedded in the fitting groove (33) by magnetic force.

5. A mechanical instrument measurement calibrator according to claim 1, characterized in that: The switching mechanism (50) is rotatably mounted on the first half shell (11) via a rotating mechanism (40), the rotating mechanism (40) comprising two first rotating grooves (41) provided on the first half shell (11), and rotating rods (42) are rotatably embedded in the two first rotating grooves (41), a sleeve rod (43) is sleeved and mounted on the surface of the rotating rod (42), the sleeve rod (43) is connected to the outer wall of the mounting chamber (51), and a shifting block (44) is mounted on the outer wall of the sleeve rod (43); The outer wall of the first half shell (11) is provided with a through hole (111) for the installation chamber (51) to rotate into.

6. A mechanical instrument measurement calibrator according to claim 5, characterized in that: The top of the installation chamber (51) is provided with an arc-shaped combined channel (52), and the center position of the combined channel (52) is the same as the center position of the connecting piece (32). When the installation chamber (51) rotates with the sleeve rod (43) as the axis, the inner cavity (54) drives the engaging pieces (36) arranged at both ends of the calibration spring (28) to move along an arc track and embed into the engaging groove (33); A clamping member (55) is provided at the top of the inner cavity (54), and guide grooves (551) are provided on both sides of the clamping member (55). A clamping groove (361) matching with the clamping member (55) is provided on the engaging member (36) at the upper end of the calibration spring (28), and guide rails (362) matching with the guide groove (551) are provided on both sides of the inner wall of the clamping groove (361).

7. A mechanical instrument measurement calibrator according to claim 1, characterized in that: The inner cavity (54) is rotatably arranged in the installation chamber (51) via an adjusting mechanism (60). The adjusting mechanism (60) comprises a second rotation groove (61) provided at the bottom of the installation chamber (51) and an adjusting rod (62) rotatably arranged in the second rotation groove (61) and penetrating the middle of the inner cavity (54). When the adjusting rod (62) rotates, the inner cavity (54) rotates in the installation chamber (51). An inspection hole (53) for observing the rotation of the inner cavity (54) is provided at the top of the installation chamber (51).

8. A mechanical instrument measurement calibrator according to claim 7, characterized in that: The adjusting rod (62) is provided with a plurality of latch grooves (63) equidistantly around the adjusting rod (62), and a latch pin (64) is provided through the middle of the latch groove (63), and the latch groove (63) and the latch pin (64) are connected via a compression spring (65); A plurality of slots (66) cooperating with the latch pin (64) are formed at equal intervals around the inner wall of the second rotation groove (61), and the side walls of the slots (66) are arranged in an inclined shape.

9. A mechanical instrument measurement calibrator according to claim 1, characterized in that: The second rotating shaft (24) is provided with a polygonal positioning groove (241), and a positioning pin (242) can be inserted into the positioning groove (241); The second half shell (12) is provided with a sliding groove (243), and a sliding rod (244) is slidably embedded in the sliding groove (243), and the end of the sliding rod (244) is connected to the positioning pin (242).

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