A comprehensive metering and testing device for chemical instruments

Abstract

The application discloses a kind of comprehensive metrological verification device for chemical instrument, it is related to metrological equipment detection technical field, comprising: shell, the shell inside is equipped with four support platform, the shell top is equipped with weighing verification subassembly, the shell includes lower shell, the lower shell top is fixedly connected with upper shell, the lower shell inner bottom and upper shell inner top are rotatably connected with middle shaft.The application is used, the weighing verification subassembly is placed in different weight weight test measurement scale in different weighing range of weighing accuracy, then whether the measurement scale weighing surface is bent and deformed in assembling and using process is detected by matrix range finder, the weighing accuracy of measurement scale is strictly controlled, and in the weighing process, it can be realized that weight is placed on measurement scale alone for verification, ensures that the verification accuracy solves the problem that manual verification is inconvenient, ensures that measurement scale will not appear measurement deviation in chemical experiment process.

Description

Technical Field

[0001] The present invention relates to the technical field of metering equipment detection, in particular to a comprehensive metering and calibration device for chemical instruments. Background Art

[0002] The comprehensive metering equipment used in chemical instruments is mainly used to measure the properties of chemical substances, including pH meters, conductivity meters, spectrophotometers, and measuring scales. During chemical experiments, material parameters need to be highly precise, so the metering accuracy of the metering equipment needs to be guaranteed. Therefore, the metering accuracy of chemical metering equipment needs to be calibrated after leaving the factory and during long-term use.

[0003] In the prior art, the main calibration method for the measuring scales in chemical metrology equipment is to simply place weights of different weights on the measuring scale for weighing, and then determine whether the obtained value is consistent with the weight of the weight itself. The calibration method is simple. Precisely because the calibration method for measuring scales used in chemical experiments is simple, manual calibration is often adopted. In the process of calibrating a large number of measuring scales, it is necessary to repeatedly place multiple weights of different weights and record the error values. This is not only inconvenient to operate, but also prone to data recording errors due to fatigue during a long calibration process, resulting in inaccurate calibration results.

[0004] Therefore, a comprehensive metrological calibration device for chemical instruments is proposed to solve the problems raised in the above background technology. Summary of the Invention

[0005] The object of the present invention is to provide a comprehensive metrological calibration device for chemical instruments to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a comprehensive metrological verification device for chemical instruments, comprising: a shell, four supporting platforms are provided inside the shell, a weighing verification assembly is provided on the top of the shell, the shell comprises a lower shell, the top of the lower shell is fixedly connected to the upper shell, a central axis is rotatably connected between the bottom of the lower shell and the top of the upper shell, four groups of supporting rods are radially distributed on the outer surface of the central axis, the supporting platform comprises a placement plate, a measuring scale is placed on the top of the placement plate, a group of sliding sleeves are fixed to the bottom of the placement plate, the sliding sleeves are slidably sleeved on the outer surface of the supporting rods, and the number of the weighing verification assemblies is set to two. They all include a first electric push rod, and the two first electric push rods are respectively fixedly installed on the top of the upper shell near the right side and the rear side, the telescopic end of the first electric push rod is fixedly connected to the extension plate, the bottom of the extension plate is fixedly connected to a circular sleeve, the outer surface of the circular sleeve is equidistantly fixedly connected to a plurality of U-shaped frames, a wedge block is provided on the inner side of the U-shaped frame, a weight is provided under the circular sleeve, the top of the weight is fixedly connected to a connecting column, the top of the connecting column is fixedly connected to a fixed block, the external sliding sleeve of the connecting column is provided with a movable block, the top of the fixed block and the bottom of the movable block are both arc-shaped, and the bottom of the wedge block is provided with an inclined surface on the side close to the fixed block.

[0007] Preferably, a limiting groove is provided on the inner wall of the U-shaped frame, a limiting block is fixedly provided on the outer surface of the wedge block, the limiting block and the limiting groove are slidably connected, a third spring extending outward is installed inside the wedge block, and the end of the third spring away from the wedge block conflicts with the inner wall of the U-shaped frame.

[0008] Preferably, the weight is placed on the top of the weighing scale, a limit plate is fixed near the middle of the outer surface of the connecting column, the movable block is located between the limit plate and the fixed block, and the movable block and the fixed block are both matched with the wedge block.

[0009] Preferably, a motor is installed at a position near the central axis on the top of the upper shell, and the output end of the motor rotates through the top of the upper shell and extends downward. The output end of the motor is fixedly connected to a first gear, and a second gear is fixedly connected to a position near the upper end of the outside of the central axis, and the first gear and the second gear are meshed.

[0010] Preferably, an industrial camera is installed at the bottom of the extension plate away from the circular sleeve, and a second electric push rod is installed at the top of the upper shell near the left side. The output end of the second electric push rod slides through the upper shell and extends downward. The telescopic end of the second electric push rod is fixedly connected to a matrix rangefinder. The matrix rangefinder is matched with a measuring scale, and an opening is provided near the front side of the upper shell.

[0011] Preferably, the bottom of the circular sleeve is trumpet-shaped, a travel switch is installed on the outer surface of the U-shaped frame away from the wedge block, the travel switch trigger end extends to the other side, and an outwardly extending ejector pin is installed inside the wedge block, and the ejector pin is used to squeeze the travel switch trigger end.

[0012] Preferably, the top of the storage plate is symmetrically and slidingly connected to a splint, and a through groove is provided at the corresponding positions of the top of the storage plate and the splint, a telescopic rod is fixedly installed at the center of the bottom of the storage plate, the bottom end of the telescopic rod is fixedly connected to a connecting plate, and the two sides of the connecting plate are symmetrically and rotatably connected to connecting rods, and the upper end of the connecting rod is rotatably connected to a rotating seat, the rotating seat is located inside the through groove and the rotating seat is fixed to the bottom of the splint, and a second spring is sleeved on the outside of the telescopic rod, and the two ends of the second spring respectively conflict with the connecting plate and the storage plate.

[0013] Preferably, a first spring is sleeved on the outside of the supporting rod, and the two ends of the first spring are respectively in conflict with the central axis and the sliding sleeve. Pulleys are installed at two corners of the storage plate, and the storage plate is rolled and fitted with the inner wall of the lower shell through the pulleys.

[0014] Preferably, the lower shell is circularly arranged near the rear side, and the lower shell extends forward near the front side and gradually shrinks inward. A V-shaped ladder plate is fixedly connected to the bottom of the lower shell near the front side, and the front side height of the V-shaped ladder plate is higher than the rear side height. A movable ball head is installed at the bottom of the connecting plate, and the ball head and the V-shaped ladder plate are in rolling cooperation.

[0015] Preferably, the position of the splint near the outer side is symmetrically bent, and the motor, the first electric push rod, the industrial camera, the limit switch, the second electric push rod and the matrix rangefinder are all electrically connected to the external controller through lines.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the present invention is used, weights of different weights are placed on the weighing verification component to test the weighing accuracy of the weighing scale in different weighing ranges, and then the matrix rangefinder is used to detect whether the weighing surface of the weighing scale is bent or deformed during assembly and use, thereby strictly controlling the weighing accuracy of the weighing scale. In addition, the weighing process can be automated by placing weights separately on the weighing scale for verification, thereby ensuring the verification accuracy and solving the problem of inconvenience of manual verification, thereby ensuring that the weighing scale will not have measurement deviation during chemical experiments.

[0018] 2. When the present invention is in use, the front supporting platform carries the weighing scale into the equipment for weighing verification and flatness verification. Under the action of the clamping plate, rotating seat, connecting rod, connecting plate, telescopic rod and second spring, it has the function of automatically clamping and positioning the weighing scale in the middle position of the storage plate. After the verification is completed, the supporting platform will send the weighing scale back to the front open position and release the clamping of the weighing scale, which improves the degree of automation and does not require additional driving equipment, ensuring the use effect and convenience of the device.

[0019] 3. When the present invention is used, during the process of connecting and disconnecting the circular sleeve and the weight, each time the wedge block passes over the fixed block and the movable block and moves outward, the ejector pin extending outward inside it will trigger the travel switch on the surface of the U-shaped frame. During the process, the travel switch will send an electrical signal in time to control the further operation of the first electric push rod, industrial camera and motor associated with it. It has a simple structure and practical functions, which improves the degree of automation while reducing the number and cost of control equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0021] Figure 2 A cross-sectional view of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0022] Figure 3 A top view of the internal structure of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0023] Figure 4 A cross-sectional view of the housing of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0024] Figure 5 A three-dimensional diagram of a supporting platform for a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0025] Figure 6 This is an expanded view of a supporting platform of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0026] Figure 7 This is a development view from another angle of the supporting platform of the comprehensive metrological verification device for a chemical instrument of the present invention;

[0027] Figure 8 This is a schematic structural diagram of a second electric push rod of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0028] Figure 9 A side view of a partial structure of a weighing verification component of a comprehensive metrological verification device for a chemical instrument according to the present invention;

[0029] Figure 10 This is a partial structural sectional view of a weighing verification component of a comprehensive metrological verification device for a chemical instrument according to the present invention.

[0030] In the figure: 1. Housing; 101. Lower housing; 102. Upper housing; 103. V-shaped ladder plate; 104. Central shaft; 105. Support rod; 106. First spring; 107. Motor; 108. First gear; 109. Second gear; 110. Opening; 2. Support platform; 201. Storage plate; 202. Clamping plate; 203. Rotating seat; 204. Connecting rod; 205. Connecting plate; 206. Telescopic rod; 207. Second spring; 208. Ball head; 209. Sliding sleeve; 210. Pulley; 211 , through slot; 212, weighing scale; 3, weighing verification assembly; 301, first electric push rod; 302, extension plate; 303, industrial camera; 304, circular sleeve; 305, U-shaped frame; 306, limit slot; 307, wedge block; 308, limit block; 309, third spring; 310, travel switch; 311, weight; 312, connecting column; 313, limit plate; 314, movable block; 315, fixed block; 316, ejector pin; 4, second electric push rod; 41, matrix rangefinder. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1-10As shown, the present invention provides a technical solution: a comprehensive metrological verification device for chemical instruments, comprising: a shell 1, four supporting platforms 2 are provided inside the shell 1, a weighing verification component 3 is provided on the top of the shell 1, the shell 1 comprises a lower shell 101, the top of the lower shell 101 is fixedly connected to the upper shell 102, a central axis 104 is rotatably connected between the bottom of the lower shell 101 and the top of the upper shell 102, four groups of supporting rods 105 are radially distributed on the outer surface of the central axis 104, the supporting platform 2 comprises a placement plate 201, a measuring scale 212 is placed on the top of the placement plate 201, a group of sliding sleeves 209 are fixed to the bottom of the placement plate 201, the sliding sleeves 209 are slidably sleeved on the outer surface of the supporting rods 105, the number of weighing verification components 3 is set to two, and each includes a first electric push rod 301 The two first electric push rods 301 are respectively fixedly installed on the top of the upper shell 102 near the right side and the rear side. The telescopic end of the first electric push rod 301 is fixedly connected to the extension plate 302, and the bottom of the extension plate 302 is fixedly connected to a circular sleeve 304. The outer surface of the circular sleeve 304 is fixedly connected with multiple U-shaped frames 305 at equal intervals. A wedge block 307 is provided on the inner side of the U-shaped frame 305, and a weight 311 is provided under the circular sleeve 304. The top of the weight 311 is fixedly connected to a connecting column 312, and the top of the connecting column 312 is fixedly connected to a fixed block 315. The outer sliding sleeve of the connecting column 312 is provided with a movable block 314. The top of the fixed block 315 and the bottom of the movable block 314 are both arc-shaped, and the bottom of the wedge block 307 is provided with an inclined surface on the side close to the fixed block 315.

[0033] A limiting groove 306 is provided on the inner wall of the U-shaped frame 305, and a limiting block 308 is fixedly provided on the outer surface of the wedge block 307. The limiting block 308 is slidably connected to the limiting groove 306. A third spring 309 extending outward is installed inside the wedge block 307, and the end of the third spring 309 away from the wedge block 307 conflicts with the inner wall of the U-shaped frame 305.

[0034] The weight 311 is placed on the top of the weighing scale 212, and a limit plate 313 is fixed near the middle of the outer surface of the connecting column 312. The movable block 314 is located between the limit plate 313 and the fixed block 315. The movable block 314 and the fixed block 315 are both matched with the wedge block 307.

[0035] A motor 107 is installed at the top of the upper shell 102 near the central axis 104. The output end of the motor 107 rotates through the top of the upper shell 102 and extends downward. The output end of the motor 107 is fixedly connected to a first gear 108. A second gear 109 is fixedly connected to the outside of the central axis 104 near the upper end. The first gear 108 and the second gear 109 are meshed and connected.

[0036] An industrial camera 303 is installed at the bottom of the extension plate 302, away from the circular sleeve 304. A second electric push rod 4 is installed at the top of the upper shell 102 near the left side. The output end of the second electric push rod 4 slides through the upper shell 102 and extends downward. The telescopic end of the second electric push rod 4 is fixedly connected to a matrix rangefinder 41. The matrix rangefinder 41 cooperates with the measuring scale 212. An opening 110 is provided near the front side of the upper shell 102.

[0037] The steps of using the present invention are as follows: when using, place the weighing scale 212 from the opening 110 to the front storage plate 201. As the motor 107 drives the first gear 108 to rotate, the first gear 108 and the second gear 109 cooperate and drive the central axis 104 to rotate. The central axis 104 cooperates with the sliding sleeve 209 through the supporting rod 105 to form a support for the storage plate 201. Therefore, the front storage plate 201 will rotate with the central axis 104. When the storage plate 201 rotates 90° counterclockwise and reaches the bottom of the right weighing verification component 3, it stops rotating. At this time, the first electric push rod 301 on the right side is started to push down the circular sleeve 304, so that the corresponding weight 311 moves downward and falls on the weighing platform of the weighing scale 212. After the weight 311 falls completely, the first electric push rod 30 1 continues to push the circular sleeve 304 downward. At this time, when the wedge block 307 located below the fixed block 315 in the circular sleeve 304 moves downward, its inner end inclined surface contacts the surface of the movable block 314. Since the weight 311 cannot move downward, the movable block 314 is restricted and cannot move downward by the limiting plate 313. Therefore, after the wedge block 307 continues to move downward, the inclined surface is squeezed, forcing the wedge block 307 to move away from the movable block 314 and squeeze the third spring 309 to contract. When the wedge block 307 passes the top plane of the movable block 314, it will fit the arc surface of the movable block 314 and gradually move toward the movable block 314. Then, the telescopic end of the first electric push rod 301 contracts to drive the circular sleeve 304 to rise. The wedge block 307 will press against the movable block 314 and make it move between the connecting column 31 2 surface slides upward, when the movable block 314 and the upper fixed block 315 are completely fitted together, the weight of the fixed block 315 and the weight 311 will be applied to the movable block 314. At this time, the clamping force generated by the wedge block 307 supported by the third spring 309 cannot pull the weight of the weight 311, so it will fit the arc surface of the movable block 314 and move outward to the outermost side and move upward. When the wedge block 307 is separated from the movable block 314, it also passes over the plane at the bottom of the fixed block 315, thereby completely separating the circular sleeve 304 and the weight 311. At this time, the weight of the weight 311 that falls alone on the measuring scale 212 will be displayed on the measuring scale 212 display screen. At this time, the industrial camera 303 at the bottom of the extension plate 302 collects the display value. After the first electric push rod 301 pushes the circular sleeve 304 down again, the wedge block 307 inside the circular sleeve 304 contacts the top arc surface of the fixed block 315, which will spread outward and squeeze the third spring 309 to contract and store energy. When the wedge block 307 moves to the area between the fixed block 315 and the movable block 314, it will move to the bottom of the fixed block 315 under the action of the third spring 309. At this time, the top plane of the wedge block 307 and the bottom plane of the fixed block 315 will conflict with each other. Then the first electric push rod 301 pulls the circular sleeve 304 up again to lift the weight 311 again and make it separate from the weighing scale 212. Then, the storage plate 201 is driven by the motor 107 to continue to rotate 90 degrees.Under the action of another weighing verification component 3, a weight 311 of another weight falls on the weighing scale 212 and the weight value is recorded. Then, the weighing scale 212 continues to rotate 90° and reaches the bottom of the matrix rangefinder 41. The second electric push rod 4 pushes the matrix rangefinder 41 up and down. During the process, the matrix rangefinder 41 composed of a laser rangefinder array continuously verifies the distance between different points on the weighing surface of the weighing scale 212 and converts it into an electrical signal and transmits it to the external controller. The flatness of the weighing surface of the weighing scale 212 can be judged based on whether the distances between different points are consistent. As the weighing scale 212 continues to move, it will return to the initial open position 110. The two different weights 311 are consistent with the weight values ​​displayed twice. To determine whether the weighing accuracy of the measuring scale 212 is qualified, the weighing process can be automated by placing the weight 311 separately on the measuring scale 212 for verification, ensuring verification accuracy while solving the problem of inconvenience of manual verification. At the same time, the matrix distance meter 41 is used to measure whether the distances between different points on the weighing surface of the measuring scale 212 are consistent to determine whether the weighing surface is flat, avoiding the bending of the weighing surface of the measuring scale 212 during assembly and affecting the weighing accuracy, ensuring that the measuring scale will not have measurement deviations during chemical experiments. The upper shell 102 cooperates with the lower shell 101 to form the device housing. When the wedge block 307 slides inside the U-shaped frame 305, the limit block 308 and the limit groove 306 cooperate with each other to form a limit for the wedge block 307.

[0038] Example 2: Figure 10 As shown, the difference between the embodiment and the base is that the bottom of the circular sleeve 304 is trumpet-shaped, and a limit switch 310 is installed on the outer surface of the U-shaped frame 305 away from the wedge block 307. The trigger end of the limit switch 310 extends to the other side, and an outward-extending ejector pin 316 is installed inside the wedge block 307. The ejector pin 316 is used to squeeze the trigger end of the limit switch 310.

[0039] The steps of using the present invention are as follows: during the use of the device, when the circular sleeve 304 and the weight 311 are connected and disconnected, each time the wedge block 307 moves outward over the fixed block 315 and the movable block 314, the ejector pin 316 extending outward from the inside thereof will trigger the limit switch 310 on the surface of the U-shaped frame 305. During the process, the limit switch 310 will send an electrical signal in a timely manner to control the further operation of the first electric push rod 301, the industrial camera 303 and the motor 107 associated therewith. The structure is simple and the function is practical. The degree of automation is improved while the number and cost of control equipment are reduced.

[0040] Example 3: Figure 1-Figure 7As shown, the difference between the embodiment and the basis is that the top of the storage plate 201 is symmetrically and slidingly connected to the splint 202, and the corresponding positions of the top of the storage plate 201 and the splint 202 are opened with a through groove 211. A telescopic rod 206 is fixedly installed at the center of the bottom of the storage plate 201, and the bottom end of the telescopic rod 206 is fixedly connected to the connecting plate 205. The connecting plate 205 is symmetrically and rotatably connected to the connecting rod 204 on both sides, and the upper end of the connecting rod 204 is rotatably connected to the rotating seat 203. The rotating seat 203 is located inside the through groove 211 and the rotating seat 203 is fixed to the bottom of the splint 202. A second spring 207 is provided on the outside of the telescopic rod 206, and the two ends of the second spring 207 are respectively in conflict with the connecting plate 205 and the storage plate 201.

[0041] A first spring 106 is sleeved on the outside of the supporting rod 105, and the two ends of the first spring 106 are respectively in conflict with the central axis 104 and the sliding sleeve 209. Pulleys 210 are installed at two corners of the storage plate 201, and the storage plate 201 rolls and fits against the inner wall of the lower shell 101 through the pulleys 210.

[0042] The lower shell 101 is circular near the rear side, and the lower shell 101 extends forward near the front side and gradually shrinks inward. A V-shaped ladder plate 103 is fixedly connected to the bottom of the lower shell 101 near the front side. The front side height of the V-shaped ladder plate 103 is higher than the rear side height. A movable ball head 208 is installed at the bottom of the connecting plate 205, and the ball head 208 and the V-shaped ladder plate 103 are in rolling engagement.

[0043] The position of the clamping plate 202 near the outer side is symmetrically bent, and the motor 107, the first electric push rod 301, the industrial camera 303, the limit switch 310, the second electric push rod 4 and the matrix rangefinder 41 are all electrically connected to the external controller through lines.

[0044] The steps of using the present invention are as follows: since the ball head 208 below the front storage plate 201 conflicts with the top of the V-shaped ladder plate 103, the telescopic rod 206 and the second spring 207 are in a contracted state, the connecting rod 204 is tilted, and the distance between the two clamping plates 202 at the top of the storage plate 201 is large. When in use, the weighing scale 212 is placed above the front storage plate 201. As the storage plate 201 moves along the central axis 104, the pulley 210 on the front side of the storage plate 201 will move in accordance with the contracted inclined inner part of the front side of the lower shell 101 and gradually approach. At this time, the ball head 208 will move from the high position on the front side of the V-shaped ladder plate 103 to the low position on the rear side and the whole As the height of the body decreases, as the storage plate 201 moves to the circular area on the rear side of the lower shell 101, the ball head 208 will completely break away from the V-shaped ladder plate 103 and hang in the air. At this time, the second spring 207 pushes the connecting plate 205 downward and drives the telescopic rod 206 to extend, ensuring that the connecting plate 205 drops straight down. When the connecting plate 205 drops, it will pull the lower ends of the connecting rods 204 on both sides to drop, and the connecting rod 204 as a whole will further tilt and pull the two splints 202 to move synchronously and approach each other. During this process, the upper end of the connecting rod 204 will rotate with the rotating seat 203. When the two splints 202 approach each other, they will push the weighing scale 212 to the middle position of the storage plate 201 and align with each other. The weighing scale 212 applies a clamping force to ensure good stability during the subsequent calibration process, and the two sides of the clamping plate 202 are symmetrically inclined. When the clamping width of the weighing scale 212 is greater than the length of the straight surface in the middle of the clamping plate 202, the inclined surfaces on both sides will form a four-point clamping, which is suitable for use with weighing scales 212 of different sizes, thereby improving the versatility of the device and the reliability during use. After the calibration of the weighing scale 212 is completed, as the storage plate 201 returns from the circular area on the rear side of the lower shell 101 to the front side contraction area, the first spring 106 on the surface of the support rod 105 will push the sliding sleeve 209, so that the storage plate 201 fits the lower shell 101 The inner wall is moved to the front opening 110 position. During the process, the ball head 208 will roll from the lower rear side of the V-shaped ladder plate 103 to the higher front side, thereby releasing the clamping plate 202 from the fixation of the weighing scale 212. During the entire operation, it is only necessary to place the weighing scale 212 for chemical experiments into the equipment. Automatic clamping can be completed during the calibration process, and it will be automatically sent out and released after the calibration is completed. No additional driving equipment is required, which improves the use effect and convenience. The clamping plate 202 is installed above the storage plate 201 through an embedded slide rail. The upper surface of the storage plate 201 needs to be kept flat, and the through groove 211 is used to avoid the rotating seat 203.

[0045] The effect and working principle of the entire mechanism are as follows: when in use, the weighing scale 212 is placed from the opening 110 to the front storage plate 201. As the motor 107 drives the first gear 108 to rotate, the second gear 109 meshing with the first gear 108 will drive the central axis 104 to rotate, and the central axis 104 is inserted into the sliding sleeve 209 at the bottom of the storage plate 201 through the supporting rod 105 to form a support for the storage plate 201. Therefore, the front storage plate 201 will rotate with the central axis 104. When the storage plate 201 rotates 90° counterclockwise and reaches the bottom of the right weighing verification component 3, it stops rotating. At this time, the first electric push rod 301 on the right side is started to push down the circular sleeve 304, so that the corresponding weight 311 moves downward and falls on the weighing platform of the weighing scale 212, and the weight 311 After it has completely fallen, the first electric push rod 301 continues to push the circular sleeve 304 downward. At this time, when the wedge block 307 located below the fixed block 315 in the circular sleeve 304 moves downward, its inner end inclined surface contacts the surface of the movable block 314. Since the weight 311 cannot move downward, the movable block 314 is restricted and cannot move downward by the limiting plate 313. Therefore, after the wedge block 307 continues to move downward, the inclined surface is squeezed, forcing the wedge block 307 to move away from the movable block 314 and compressing the third spring 309 to contract. When the wedge block 307 passes the top plane of the movable block 314, it will fit the arc surface of the movable block 314 and gradually move toward the movable block 314. Then, the telescopic end of the first electric push rod 301 contracts, driving the circular sleeve 304 to rise, and the wedge block 307 will press against the movable block 314. When the wedge block 307 is separated from the movable block 314, it also passes over the plane at the bottom of the fixed block 315, thereby completely separating the circular sleeve 304 and the weight 311. At this time, the weight of the weight 311 that falls alone on the measuring scale 212 will be displayed on the measuring scale 212 display screen. At this time, the industrial camera 303 at the bottom of the extension plate 302 is monitoring the display screen value. After the data is collected, it is converted into an electrical signal and transmitted to the external controller. Then, the first electric push rod 301 pushes the circular sleeve 304 down again, and when the wedge block 307 inside the circular sleeve 304 contacts the arc surface of the top of the fixed block 315, it will spread outward and squeeze the third spring 309 to contract and store energy. When the wedge block 307 moves to the area between the fixed block 315 and the movable block 314, it will move to the bottom of the fixed block 315 under the action of the third spring 309. At this time, the top plane of the wedge block 307 and the bottom plane of the fixed block 315 are in conflict. Then, the first electric push rod 301 pulls the circular sleeve 304 up again to lift the weight 311 again and make it separate from the weighing scale 212. Then, under the drive of the motor 107, the storage plate 201 continues to rotate 90°.Under the action of another weighing verification component 3, another weight 311 falls on the weighing scale 212 and the weight value is recorded. Then, the weighing scale 212 continues to rotate 90° and reaches the bottom of the matrix rangefinder 41. The second electric push rod 4 pushes the matrix rangefinder 41 up and down. During the process, the matrix rangefinder 41 composed of a laser rangefinder array continuously verifies the distance between different points on the weighing surface of the weighing scale 212 and converts it into an electrical signal and transmits it to the external controller. The flatness of the weighing surface of the weighing scale 212 can be judged based on whether the distances between different points are consistent. As the weighing scale 212 continues to move, it will return to the initial open position. At the position of port 110, whether the weighing accuracy of the measuring scale 212 is qualified is judged according to whether the weights 311 of two different weights are consistent with the weight values ​​displayed twice. During the weighing process, the weights 311 can be automatically placed on the measuring scale 212 for verification, which ensures the verification accuracy while solving the problem of inconvenience of manual verification. At the same time, the distance between different points on the weighing surface of the measuring scale 212 is measured by the matrix distance meter 41 to determine whether the weighing surface is flat, thereby avoiding the bending of the weighing surface of the measuring scale 212 during the assembly process and affecting the weighing accuracy, thereby ensuring that the measuring scale will not have measurement deviation during the chemical experiment.

[0046] In the initial state of the device, the ball head 208 below the front storage plate 201 conflicts with the top of the V-shaped ladder plate 103, the telescopic rod 206 and the second spring 207 are in a retracted state, the connecting rod 204 is tilted, and the distance between the two clamping plates 202 at the top of the storage plate 201 is large. When in use, the weighing scale 212 is placed above the front storage plate 201. As the storage plate 201 moves along the central axis 104, the pulley 210 on the front side of the storage plate 201 will move in accordance with the contracted inclined interior of the front side of the lower shell 101 and gradually approach. At this time, the ball head 208 will be in front of the V-shaped ladder plate 103. The side high position moves toward the rear low position and the overall height decreases. As the storage plate 201 moves to the circular area on the rear side of the lower shell 101, the ball head 208 will completely break away from the V-shaped ladder plate 103 and hang in the air. At this time, the second spring 207 pushes the connecting plate 205 downward and drives the telescopic rod 206 to extend, ensuring that the connecting plate 205 drops straight down. When the connecting plate 205 drops, it will pull the lower ends of the connecting rods 204 on both sides to drop, and the connecting rods 204 as a whole will further tilt and pull the two splints 202 to move synchronously and close together. During this process, the upper end of the connecting rod 204 will rotate with the rotating seat 203. When the two splints 20 2 will push the weighing scale 212 to the middle position of the storage plate 201 and apply a clamping force to the weighing scale 212 to ensure good stability during the subsequent verification process. In addition, the two sides of the clamping plate 202 are symmetrically inclined. When the clamping width of the weighing scale 212 is greater than the length of the straight surface in the middle of the clamping plate 202, the inclined surfaces on both sides will form a four-point clamping, which is suitable for weighing scales 212 of different sizes, thereby improving the versatility of the device and the reliability during use. After the verification of the weighing scale 212 is completed, as the storage plate 201 returns from the circular area on the rear side of the lower shell 101 to the contracted area on the front side, the bearing The first spring 106 on the surface of the support rod 105 pushes the sliding sleeve 209, so that the storage plate 201 is attached to the inner wall of the lower shell 101 and moves to the front opening 110. During this process, the ball head 208 rolls from the lower rear side of the V-shaped ladder plate 103 to the higher front side, thereby releasing the clamping plate 202 from the fixed weighing scale 212. During the entire operation, it is only necessary to place the weighing scale 212 for chemical experiments into the device. It can be automatically clamped during the calibration process and automatically sent out and released after the calibration is completed. No additional driving equipment is required, which improves the use effect and convenience.

[0047] When the circular sleeve 304 and the weight 311 are connected and disconnected, each time the wedge block 307 moves outward over the fixed block 315 and the movable block 314, the ejector pin 316 extending outward from the inside thereof will trigger the limit switch 310 on the surface of the U-shaped frame 305. During the process, the limit switch 310 will send an electrical signal in a timely manner to control the further operation of the first electric push rod 301, the industrial camera 303 and the motor 107 associated therewith. It has a simple structure and practical functions, which improves the degree of automation while reducing the number and cost of control equipment.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A comprehensive metrological verification device for chemical instruments, characterized in that: include: A housing (1), wherein four supporting platforms (2) are provided inside the housing (1), and a weighing verification component (3) is provided on the top of the housing (1); The housing (1) comprises a lower housing (101), the top of the lower housing (101) is fixedly connected to the upper housing (102), a central axis (104) is rotatably connected between the inner bottom of the lower housing (101) and the inner top of the upper housing (102), and four groups of supporting rods (105) are radially distributed on the outer surface of the central axis (104); The support platform (2) includes a storage plate (201), a weighing scale (212) is placed on the top of the storage plate (201), and a set of sliding sleeves (209) are fixed to the bottom of the storage plate (201), and the sliding sleeves (209) are slidingly mounted on the outer surface of the support rod (105); The number of the weighing verification components (3) is set to two, each including a first electric push rod (301), the two first electric push rods (301) are fixedly mounted on the top of the upper shell (102) near the right side and the rear side, respectively, the telescopic end of the first electric push rod (301) is fixedly connected to the extension plate (302), the bottom of the extension plate (302) is fixedly connected to the circular sleeve (304), the outer surface of the circular sleeve (304) is fixedly connected to a plurality of U-shaped frames (305) at equal intervals, the inner side of the U-shaped frame (305) is provided with a wedge block (307), the bottom of the circular sleeve (304) is provided with a weight (311), the top of the weight (311) is fixedly connected to a connecting column (312), the connecting column (31 2) A fixed block (315) is fixedly connected to the top end, a movable block (314) is provided on the outer sliding sleeve of the connecting column (312), the top of the fixed block (315) and the bottom of the movable block (314) are both arranged in an arc shape, a slope is provided on the side of the bottom of the wedge block (307) close to the fixed block (315), a third spring (309) extending outward is installed inside the wedge block (307), an end of the third spring (309) away from the wedge block (307) is in conflict with the inner wall of the U-shaped frame (305), a limiting plate (313) is fixed near the middle of the outer surface of the connecting column (312), and the movable block (314) is located between the limiting plate (313) and the fixed block (315).

2. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: A limiting groove (306) is provided on the inner surface wall of the U-shaped frame (305), and a limiting block (308) is fixedly provided on the outer surface of the wedge-shaped block (307). The limiting block (308) and the limiting groove (306) are slidably connected.

3. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: The weight (311) is placed on top of the weighing scale (212), and the movable block (314) and the fixed block (315) are both matched with the wedge block (307).

4. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: A motor (107) is installed at a position near the middle axis (104) on the top of the upper shell (102). The output end of the motor (107) rotates through the top of the upper shell (102) and extends downward. The output end of the motor (107) is fixedly connected to a first gear (108). A second gear (109) is fixedly connected to the outside of the middle axis (104) near the upper end. The first gear (108) and the second gear (109) are meshed and connected.

5. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: An industrial camera (303) is installed at the bottom of the extension plate (302) at a position away from the circular sleeve (304), and a second electric push rod (4) is installed at a position near the left side of the top of the upper shell (102). The output end of the second electric push rod (4) slides through the upper shell (102) and extends downward. The telescopic end of the second electric push rod (4) is fixedly connected to a matrix rangefinder (41). The matrix rangefinder (41) and the measuring scale (212) are matched. An opening (110) is provided near the front side of the upper shell (102).

6. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: The bottom of the circular sleeve (304) is horn-shaped. A travel switch (310) is installed on the outer surface of the U-shaped frame (305) on the side away from the wedge-shaped block (307). The trigger end of the travel switch (310) extends to the other side. An outwardly extending ejector pin (316) is installed inside the wedge-shaped block (307). The ejector pin (316) is used to squeeze the trigger end of the travel switch (310).

7. The comprehensive metrological verification device for chemical instruments according to claim 4, characterized in that: The top of the storage plate (201) is symmetrically and slidingly connected to the clamping plate (202), and a through groove (211) is provided at the corresponding positions of the top of the storage plate (201) and the clamping plate (202). A telescopic rod (206) is fixedly installed at the center of the bottom of the storage plate (201), and the bottom end of the telescopic rod (206) is fixedly connected to the connecting plate (205). The connecting plate (205) is symmetrically and rotationally connected to the connecting rod (204) on both sides. The upper end of the connecting rod (204) is rotationally connected to the rotating seat (203), and the rotating seat (203) is located inside the through groove (211) and the rotating seat (203) is fixed to the bottom of the clamping plate (202). A second spring (207) is sleeved on the outside of the telescopic rod (206), and the two ends of the second spring (207) are respectively in conflict with the connecting plate (205) and the storage plate (201).

8. The comprehensive metrological verification device for chemical instruments according to claim 1, characterized in that: The supporting rod (105) is provided with a first spring (106) on the outside, and the two ends of the first spring (106) are respectively in conflict with the central axis (104) and the sliding sleeve (209). The storage plate (201) is provided with pulleys (210) at two corners, and the storage plate (201) is rolled and fitted with the inner wall of the lower shell (101) through the pulleys (210).

9. The comprehensive metrological verification device for chemical instruments according to claim 7, characterized in that: The lower shell (101) is arranged in a circular shape near the rear side, and the lower shell (101) extends forward near the front side and gradually shrinks inward. A V-shaped ladder plate (103) is fixedly connected to the bottom of the lower shell (101) near the front side, and the front side height of the V-shaped ladder plate (103) is higher than the rear side height. A movable ball head (208) is installed at the bottom of the connecting plate (205), and the ball head (208) and the V-shaped ladder plate (103) are in rolling engagement.

10. The comprehensive metrological verification device for chemical instruments according to claim 7, characterized in that: The position of the clamping plate (202) near the outer side is symmetrically bent, and the motor (107), the first electric push rod (301), the industrial camera (303), the limit switch (310), the second electric push rod (4) and the matrix rangefinder (41) are all electrically connected to the external controller through a circuit.

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