Caliper calibration device with adjustable center distance

Abstract

The utility model discloses an adjustable center distance caliper calibration device, which comprises a rectangular bottom plate and rectangular guard plates fixed on two transverse sides of the rectangular bottom plate, and a mounting groove is formed between the rectangular guard plates. The adjustable center distance caliper calibration device further comprises a plurality of measuring block gauges with different lengths, clamping block gauges which are used for being arranged on the two sides of the measuring block gauges to form a concave measuring opening, and a block gauge clamper which is used for enabling the measuring block gauges and the clamping block gauges to abut against each other. According to the adjustable center distance caliper calibration device, the measurement block gauges with different lengths are matched with the clamping block gauges to form concave measurement ports with different measurement lengths, so that the purpose of providing a plurality of calibration points for center distance caliper calibration is realized; and the adopted block gauge holder can conveniently and quickly fix the measuring block gauge and the clamping block gauge, and is simple to assemble, use and operate.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement calibration, in particular to a caliper calibration device. Background Art

[0002] The center distance caliper is a measuring instrument that uses the vernier reading principle, mechanical rotation system or electronic measurement, digital display principle, and reads the distance divided by the relative movement of the center lines of two cones or cylinders through indicating devices such as vernier, indicator or digital display. Since the center distance caliper has errors after leaving the factory or use, users often need to calibrate its indication error at intervals to ensure the accuracy of the measurement results. Calibration is generally performed using a standard with a certain length. Patent authorization announcement number CN214333567U provides a combined standard block for center distance caliper calibration. This standard block is a device that can provide a fixed standard value. Generally, it has certain advantages for calibrating the indication error of the center distance caliper with a fixed measurement range. However, according to different measurement ranges, combined standard blocks of different specifications need to be configured. The specifications are numerous, difficult to match, and expensive; this combined standard block can only provide a few fixed standard values, the calibration points have been solidified, and no more calibration points can be provided, which limits the use environment and is not convenient for calibrating the center distance caliper with a measurement range greater than 500mm. Patent authorization announcement No. 217132011U provides an adjustable center distance caliper indication error calibration device. Although this device solves the disadvantages in the above patent, in actual operation, because the first center distance standard block, the second center distance standard block and the common gauge block are not the same type of blocks, it is easy to cause the combination to be incomplete, thus making the provided standard value inaccurate. Each of the first center distance standard block and the second center distance standard block can only provide one standard hole. When encountering center distance calipers with conical probes of different specifications, different first center distance standard blocks and second center distance standard blocks need to be configured, which increases the cost of use. At the same time, during installation, it is difficult to ensure that the centers of the first center distance standard block and the second center distance standard block fall on the same common gauge block length axis. Considering the traceability of the calibration device, it is necessary not only to trace the ordinary gauge block, but also to trace the first center distance standard block and the second center distance standard block. Moreover, these two kinds of standard blocks need to trace the distance from the center line of the inner hole to the grinding surface and the distance from the inner hole generatrix to the grinding surface, which will inevitably increase the processing cost and the traceability cost, and reduce the accuracy of the calibration device and increase the uncertainty of the calibration device. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide an adjustable center distance caliper calibration device to solve technical problems such as providing more calibration points, a larger calibration range and reducing traceability costs for center distance caliper calibration.

[0004] The utility model discloses an adjustable center distance caliper calibration device, which comprises a rectangular bottom plate and rectangular guard plates fixed on two lateral sides of the rectangular bottom plate, and a mounting groove is formed between the rectangular guard plates;

[0005] The adjustable center distance caliper calibration device also includes a plurality of measuring blocks of different lengths, a clamping block for being arranged on both sides of the measuring block to form a concave measuring port, and a block clamp for making the measuring block and the clamping block close together; the block clamp includes a rectangular clamp for applying pressure to the clamping block, a bayonet vertically connected to the rectangular clamp, a slider that is passed through the bayonet and slidably matched with the bayonet, a spring that is sleeved on the bayonet and has two ends that respectively press against the rectangular clamp and the slider, a nut that is arranged at the end of the bayonet to prevent the slider from falling off, and a handle connected to the slider;

[0006] The measuring block gauge, clamping block gauge and block gauge clamp are placed in an installation groove formed between the rectangular guard plates, and the rectangular guard plates are also provided with handle limit grooves that slide with the handle, and a plurality of handle limit grooves are provided along the length direction of the rectangular guard plates.

[0007] Furthermore, the rectangular guard plate is also provided with a transfer slide groove for transferring the block gauge clamp along its length direction, the transfer slide groove is located above the handle limit groove, and the transfer slide groove and the handle limit groove are connected through a vertical groove.

[0008] Furthermore, the adjustable center distance caliper calibration device also includes a padding block for padding the bottom of the clamping block gauge, and the rectangular guard plate is provided with a horizontal straight groove that slides with the padding block.

[0009] Furthermore, a rubber sheet is provided on the clamping surface of the rectangular clamping plate.

[0010] Furthermore, the rectangular guard plate is connected to two lateral sides of the rectangular base plate by means of screws and nuts.

[0011] Furthermore, the adjustable center distance caliper calibration device also includes a series connection plate for connecting the rectangular guard plates in series.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model discloses an adjustable center distance caliper calibration device, which can form a concave measuring port with different measuring lengths by cooperating with a measuring block gauge and a clamping block gauge of different lengths, thereby achieving the purpose of providing multiple calibration points for center distance caliper calibration; and the block gauge clamp can conveniently and quickly fix the measuring block gauge and the clamping block gauge, and the assembly and use operations are simple.

[0014] 2. The utility model has an adjustable center distance caliper calibration device, which can connect multiple adjustable center distance caliper calibration devices in series through a series connection plate, thereby forming a larger measuring range and better meeting the calibration requirements of center distance calipers of different measuring ranges.

[0015] 3. The adjustable center distance caliper calibration device of the utility model only needs to trace the measuring block gauge and the clamping block gauge during measurement calibration traceability, and the traceability cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable center distance caliper calibration device;

[0017] Figure 2 It is a three-dimensional schematic diagram of the adjustable center distance caliper calibration device after removing a rectangular guard plate;

[0018] Figure 3 It is a schematic diagram of the series connection of the adjustable center distance caliper calibration device. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] The adjustable center distance caliper calibration device of this embodiment includes a rectangular base plate 1 and rectangular guard plates 2 fixed on two lateral sides of the rectangular base plate, and a mounting groove 3 is formed between the rectangular guard plates.

[0021] The adjustable center distance caliper calibration device also includes a plurality of measuring blocks 4 of different lengths, a clamping block 5 for being arranged on both sides of the measuring block to form a concave measuring port, and a block clamp for making the measuring block and the clamping block close together. The block clamp includes a rectangular clamp 6 for applying pressure to the clamping block, a bayonet 7 vertically connected to the rectangular clamp, a slider 8 passing through the bayonet and slidingly cooperating with the bayonet, a spring 9 sleeved on the bayonet and having its two ends respectively pressed against the rectangular clamp and the slider, a nut 10 arranged at the end of the bayonet to prevent the slider from falling off, and a handle 11 connected to the slider. In the specific implementation, the handle 11 is connected to the slider by threads, and the handle is detachable and easy to assemble.

[0022] The measuring block gauge, clamping block gauge and block gauge clamp are placed in the installation groove formed between the rectangular guard plates, and the rectangular guard plates are also provided with handle limit grooves 12 that slide with the handle, and several handle limit grooves are provided along the length direction of the rectangular guard plates.

[0023] When the adjustable center distance caliper calibration device of this embodiment is used to calibrate the center distance caliper, the method is as follows:

[0024] For the center distance caliper with a cylindrical probe, the center distance caliper and the adjustable center distance caliper calibration device should be placed in the same laboratory before calibration, and kept at a constant temperature of (20±5)℃ for 3 hours to ensure that the influence of temperature on the calibration result is minimized. Taking the center distance caliper with a cylindrical probe of 300mm as an example, three measuring blocks with lengths of 101.20mm, 201.50mm and 291.80mm are selected, so that three concave measuring ports can be formed with the clamping block (the clamping block uses a standard block with the same size). When measuring, place the cylindrical probe of the center distance caliper in the concave measuring port, adjust the ruler body of the center distance truck, so that the outer sides of the two cylindrical probes are in contact with the clamping block surface on the inner side of the concave measuring port, and then record the value of the center distance caliper at this time. Combined with the initial value and the standard distance, the indication error when measuring with the outer side of the cylindrical probe can be obtained. Similarly, adjust the position of the cylindrical probe of the center distance caliper so that it contacts the clamping block gauge surface outside the concave measuring port, record the value of the center distance caliper at this time, and combine it with the initial value and standard distance to obtain the indication error when measuring with the inside of the cylindrical probe.

[0025] For the center distance caliper with a conical probe, three concave measuring ports can be constructed using measuring blocks and clamping blocks. The measuring blocks in the first and third concave measuring ports have the same length (the specific length of the measuring blocks can be selected according to the size of the conical probe) and are smaller than the maximum diameter of the conical probe. Place the conical probe of the center distance caliper into the first and third concave measuring ports, move left and right until the minimum value appears, record the value of the center distance caliper at this time, and combine it with the initial value and the standard distance to obtain the indication error when measuring with the conical probe.

[0026] As an improvement to the above embodiment, the rectangular guard plate is also provided with a transfer chute 13 for transferring the block gauge holder along its length direction. The transfer chute is located above the handle limit slot, and the transfer chute and the handle limit slot are connected through a vertical slot 14. When replacing the measuring block gauge 4 to construct a concave measuring port, the handle 11 of the block gauge holder can be first moved into the transfer chute 13, and then the block gauge holder can slide freely along the installation slot 3. After the selected measuring block gauge 4 is placed in the installation slot 3, the block gauge holder is moved to make its rectangular clamp 6 contact with the clamping block gauge 5, and then the slider 8 is pushed by the handle 11 to compress the spring 9, so that the handle 11 enters the handle limit slot 12 through the vertical slot 14. At this time, the measuring block gauge and the clamping block gauge are pressed and fixed by the block gauge holder, and the installation operation is simple.

[0027] As an improvement to the above-mentioned embodiment, the adjustable center distance caliper calibration device also includes a padding block 15 for padding the bottom of the clamping block gauge, and the rectangular guard plate is provided with a horizontal straight groove 16 that slides with the padding block. When selecting the existing block gauge as the measuring block gauge 4 and the clamping block gauge 5 in this embodiment, since the clamping block gauge 5 and the measuring block gauge 4 have the same height, the measuring block gauge 4 needs to be padded to form a concave measuring port; therefore, the improved structure can select the existing block gauge with the same shape as the clamping block gauge 5 as the padding block, and then the clamping block gauge 5, the measuring block gauge 4 and the padding block 15 in this embodiment can all use the existing block gauge, without having to make new block gauges. Of course, in different implementations, new measuring block gauges 4 and clamping block gauges 5 can also be re-customized, so that the padding block 15 is no longer used, and there is no need to set the horizontal straight groove 16 on the rectangular guard plate.

[0028] As an improvement to the above embodiment, the clamping surface of the rectangular clamping plate is provided with a rubber sheet 17. The rubber sheet 17 can play a role of buffering and protecting the clamping block gauge during the pressurized clamping process.

[0029] As an improvement to the above embodiment, the rectangular guard plate is connected to the two lateral sides of the rectangular base plate by screws 18 and nuts 19, which is convenient for assembly.

[0030] As an improvement to the above embodiment, the adjustable center distance caliper calibration device further includes a series connection plate 20 for connecting the rectangular guard plate in series. The series connection plate is provided with a hole that can be passed through the screw 18. After the series connection plate is passed through the screw 18 and then tightened by the nut 19, the two calibration devices can be connected in series. When the range of the center distance caliper exceeds the length of a single calibration device, this improvement enables the required number of calibration devices to be connected in series through the series connection plate 20, thereby realizing the calibration of a large range center distance caliper.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An adjustable center distance caliper calibration device, characterized in that: It includes a rectangular bottom plate and rectangular guard plates fixed on both sides of the rectangular bottom plate, and a mounting groove is formed between the rectangular guard plates; The adjustable center distance caliper calibration device also includes a plurality of measuring blocks of different lengths, a clamping block for being arranged on both sides of the measuring block to form a concave measuring port, and a block clamp for making the measuring block and the clamping block close together; the block clamp includes a rectangular clamp for applying pressure to the clamping block, a bayonet vertically connected to the rectangular clamp, a slider that is passed through the bayonet and slidably matched with the bayonet, a spring that is sleeved on the bayonet and has two ends that respectively press against the rectangular clamp and the slider, a nut that is arranged at the end of the bayonet to prevent the slider from falling off, and a handle connected to the slider; The measuring block gauge, clamping block gauge and block gauge clamp are placed in an installation groove formed between the rectangular guard plates, and the rectangular guard plates are also provided with handle limit grooves that slide with the handle, and a plurality of handle limit grooves are provided along the length direction of the rectangular guard plates.

2. The adjustable center distance caliper calibration device according to claim 1, characterized in that: The rectangular guard plate is also provided with a transfer slide groove for transferring the block gauge clamp along its length direction. The transfer slide groove is located above the handle limit groove, and the transfer slide groove and the handle limit groove are connected through a vertical groove.

3. The adjustable center distance caliper calibration device according to claim 1, characterized in that: It also includes a padding block for padding the bottom of the clamping block gauge, and the rectangular guard plate is provided with a horizontal straight groove that is slidably matched with the padding block.

4. The adjustable center distance caliper calibration device according to claim 1, characterized in that: A rubber sheet is arranged on the clamping surface of the rectangular clamping plate.

5. The adjustable center distance caliper calibration device according to claim 1, characterized in that: The rectangular guard plate is connected to two lateral sides of the rectangular base plate by screws and nuts.

6. The adjustable center distance caliper calibration device according to claim 5, characterized in that: Also included is a series connection plate for connecting the rectangular guard plates in series.

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