Portable high-precision field calibration device

Abstract

The invention relates to the field of engineering detection equipment, and particularly discloses a portable high-precision field calibration device which comprises a base, a sliding block, a rotating block, supporting legs, a locking bolt, a target seat installed on the base, a target box composed of a box body and a box cover, a driving part and a lifting block, the driving part and the lifting block are installed in the box body, and the box cover is connected with the lifting block. The dial indicator is installed on the box body, and the measuring end abuts against the lifting block. Through the structure of the sliding blocks and the rotating blocks at the joints of the supporting legs and the base, the supporting legs can adapt to different heights and certain inclination degrees of the ground at the proofreading position, and the base can be leveled more conveniently; the target box is made into a split structure of a box body and a box cover, the box cover is used for mounting a scale and can move along with the lifting block, and the moving distance of the lifting block can be accurately read through the dial indicator, so that the level gauge can be accurately calibrated on site, and the target box can be conveniently stored when not used to protect the driving part in the box body; the device is suitable for portable use in field environment.

Description

Technical Field

[0001] The invention belongs to the field of engineering detection equipment, and in particular relates to a portable high-precision on-site calibration device. Background Art

[0002] The level is a commonly used measuring device in engineering surveying operations. However, the calibration of the level for monitoring is usually carried out by the Metrology Institute or the inspection and testing agency under standard indoor conditions. In actual use, it is affected by the environment, dust, temperature and humidity, and the complexity of the on-site working conditions is very different from the test conditions. Therefore, the magnitude of the measurement error cannot be directly reflected. Especially for those situations where only a single sampling measurement is performed, such as the deflection measurement of different key sections in the bridge load test, the arch sinking of different sections of the tunnel under a certain working condition, the settlement of the dam, etc., it is necessary to know the error size of the single measurement of the instrument in order to obtain more accurate on-site measurement data.

[0003] There is no dedicated and relatively accurate on-site calibration device for water levels on the market. In addition, due to the limited on-site measurement conditions, there are high technical requirements for the calibration device in terms of horizontal accuracy adjustment and portability.

[0004] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0005] The purpose of the present invention is to provide a portable high-precision on-site calibration device, thereby solving the defect that the level instrument cannot be calibrated on the construction site through a special calibration device with good portability and high precision.

[0006] To achieve the above-mentioned purpose, the present invention provides a portable high-precision on-site calibration device, including a base and a target seat, wherein the base is provided with a support leg, the target seat is connected to the base in a detachable manner, a target box is provided on the target seat, a slider is provided in the base, the slider can move along the radial direction of the base, a rotating block is embedded in the slider, a stud is provided on the top of the support leg, the stud passes through the rotating block and is provided with a locking nut, the number of the locking nuts is two and they are respectively in contact with the top and bottom surfaces of the base; the target box includes a box body and a box cover, the bottom of the box body is connected to the rotating block of the target seat The box body is movably connected and the rotation axis is perpendicular to the top surface of the target seat; a mouth is provided on the side of the box body, and a lifting block is provided on the mouth; a driving part connected to the lifting block is provided in the box body, and the driving part can drive the lifting block to move in a direction parallel to the rotation axis of the box body; the box cover is slidably connected to the lifting block and is limited by a limit bolt; the box cover can cover the mouth; an openable and closable ruler positioning plate is provided at the lower end of the box cover, a ruler finger is provided at the upper end of the box cover, and a detachable dial indicator is provided at the lower end of the mouth; the measuring end of the dial indicator faces upward and abuts against the bottom of the lifting block.

[0007] Preferably, in the above technical solution, a sliding cavity is opened on the side of the base, the sliding block is slidably arranged in the sliding cavity, and a top groove and a bottom groove are respectively opened on the top and bottom of the base, the top groove and the bottom groove are respectively connected with the top and the bottom of the sliding cavity, and the stud can pass through the top groove and the bottom groove and slide along the top groove and the bottom groove.

[0008] Preferably, in the above technical solution, inwardly concave arc surfaces are respectively provided on both sides of the top groove and both sides of the bottom groove, and an outwardly protruding arc ring is provided on the end of the locking nut facing the base, and the arc ring matches the arc surface.

[0009] Preferably, in the above technical solution, a locking bolt is provided on the side of the base, and when the locking bolt is tightened, the end of the locking bolt can tighten the side of the sliding block.

[0010] Preferably, in the above technical solution, the lower end of the support leg is bent toward one side of the support leg and is provided with a tip, the tip is parallel to the axis of the stud, and a pressing boss is provided at the top of the tip.

[0011] Preferably, in the above technical solution, the target seat includes an upper seat and a lower seat, the lower seat is connected to the base by connecting bolts, the bottom of the box body is rotatably connected to the upper seat and is provided with an external gear ring, and a foot screw is provided between the upper seat and the lower seat; the base is provided with a first horizontal bubble, and the upper seat is provided with a second horizontal bubble.

[0012] Preferably, in the above technical solution, a rotatable first worm is provided on one side of the upper seat, the first worm is meshed with the outer gear ring, and an angle bolt is provided at one end of the first worm.

[0013] Preferably, in the above technical solution, a bayonet is provided on both sides of the lifting block, the bayonet is a waist-shaped structure, and a slide groove is provided on both sides of the box cover, the bayonet is inserted into the slide groove and can slide along the slide groove; a first nail hole and a second nail hole are respectively provided on the top and bottom of the box cover, and screw holes are respectively provided on both sides of the lifting block, the positions of the screw holes correspond to the positions of the first nail hole and the second nail hole, and the limiting bolt is threadedly connected to the screw hole.

[0014] Preferably, in the above technical solution, a mounting sleeve is provided at the lower end of the mouth, a limiting hole is provided on the mounting sleeve, and a hexagonal dust cap is provided below the dial indicator, and the hexagonal dust cap can be inserted into the limiting hole to limit the axial rotation of the mounting column.

[0015] Preferably, in the above technical solution, the driving part includes a threaded rod, a guide rod, a gear, a second worm and a height knob, the lifting block is slidably mounted on the guide rod, the threaded rod is parallel to the guide rod and is threadedly connected to the lifting block, the gear is fixedly mounted on the lower end of the screw rod, the second worm is rotatably mounted below the box body and meshes with the gear, and the height knob is fixedly connected to the end of the second worm.

[0016] Compared with the existing technology, the present invention has the following beneficial effects: 1. The portable high-precision on-site calibration device of the present invention can make the support feet adapt to different heights and certain inclinations of the ground at the calibration location through the structure of the slider and the rotating block at the connection between the support feet and the base, which is more convenient for leveling the base; the target box is made into a split structure of a box body and a box cover, the box cover is used to install the ruler and can move with the lifting block, the moving distance of the lifting block can be accurately read by the dial indicator, so that the level can be accurately calibrated on-site, and it can be conveniently stored when not in use to protect the driving part in the box body, and the target seat and the base are detachable, which is suitable for portable use in field environments.

[0017] 2. The box cover in the present invention has two holes, a first nail hole and a second nail hole, which are fixedly connected to the lifting block. When working, the locking bolt is connected to the lifting block through the second nail hole. When it needs to be stored, the lifting block rises to the highest point, and the locking bolt is connected to the lifting block through the first nail hole for easy storage. The bottom of the lifting block can contact the measuring end of the dial indicator. Therefore, the lifting block not only has the function of driving the scale to move, but also plays the role of closing the box cover and the box body when stored, and also plays the role of triggering the measuring end of the dial indicator.

[0018] 3. In the present invention, both sides of the top groove and both sides of the bottom groove are respectively provided with inwardly concave arc surfaces, and the end of the locking nut facing the base is provided with an outwardly protruding arc ring. When used in the field, since there are height differences and slopes on the ground, this structure can make the studs of the support legs have a certain allowable slope when fixed, so that it can have more degrees of freedom when leveling the first horizontal bubble, which is convenient for horizontal adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the portable high-precision on-site calibration device of the present invention when it is working.

[0020] Figure 2 This is a structural diagram of the base.

[0021] Figure 3 It is a partial cutaway view of the slider.

[0022] Figure 4 It is a structural diagram of the locking nut.

[0023] Figure 5 It is a partial cross-sectional view of the target stand and target box.

[0024] Figure 6 It is a structural diagram of the target box when the lid is opened.

[0025] Figure 7 It is a structural diagram of the lifting block.

[0026] Figure 8 It is the structural diagram of the dial indicator.

[0027] Description of main reference numerals: 100-base, 101-sliding cavity, 102-top groove, 103-bottom groove, 104-arc surface, 110-sliding block, 111-rotating block, 120-locking nut, 121-arc ring, 130-locking bolt, 140-first horizontal bubble; 200-target seat, 210-upper seat, 211-first worm, 212-angle bolt, 220-lower seat, 230-connecting bolt, 240-foot screw, 250-second level bubble; 300-support foot, 310-tip portion, 320-pressing boss, 330-fitting surface, 340-stud; 400-target box, 410-box body, 411-mouth, 412-outer gear ring, 420-box cover, 421-slideway, 422-first nail hole, 423-second nail hole, 430-lifting block, 431-limiting bolt, 432-bayonet, 433-screw hole, 434-limiting groove, 440-installation sleeve, 441-limiting hole, 450-ruler finger, 451-rubber sleeve, 460-ruler positioning plate, 461-positioning protrusion, 462-receiving groove; 500- dial indicator, 510- measuring rod, 520- hexagonal dust cap; 600 - threaded rod, 610 - guide rod, 620 - gear, 630 - second worm, 640 - height knob. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of the embodiments of the present invention based on its overall structure.

[0032] like Figures 1 to 8 As shown, the portable high-precision on-site calibration device in this embodiment includes: a base 100, a sliding cavity 101, a top groove 102, a bottom groove 103, an arc surface 104, a slider 110, a rotating block 111, a limit groove 434, a locking nut 120, an arc ring 121, a locking bolt 130, a first horizontal bubble 140, a target seat 200, an upper seat 210, a first worm 211, an angle bolt 212, a lower seat 220, a connecting bolt 230, a foot screw 240, a second horizontal bubble 250, a support foot 300, a tip 310, a pressing boss 320, a fitting surface 330, a screw Column 340, target box 400, box body 410, mouth 411, outer gear ring 412, box cover 420, slide groove 421, first nail hole 422, second nail hole 423, lifting block 430, limit bolt 431, bayonet 432, screw hole 433, installation sleeve 440, limit hole 441, ruler finger 450, rubber sleeve 451, ruler positioning plate 460, positioning protrusion 461, storage groove 462, dial indicator 500, measuring rod 510, hexagonal dust cap 520, threaded rod 600, guide rod 610, gear 620, second worm 630, height knob 640.

[0033] A rectangular sliding cavity 101 is provided on the side of the base 100, and the number of the sliding cavities 101 is three and is evenly distributed in the center of the base 100. The slider 110 is slidably mounted in the sliding cavity 101. A rotating block 111 is embedded in the middle of the slider 110. The rotating axis of the rotating block 111 is horizontally arranged and perpendicular to the sliding direction of the slider 110. A through hole is provided on the side of the rotating block 111; a rectangular top groove 102 and a bottom groove 103 are respectively provided on the top and bottom of the base 100, and the top groove 102 and the bottom groove 103 are respectively connected to the top of the sliding cavity 101 and the bottom of the sliding cavity 101; the stud 340 is fixedly connected to the top of the support leg 300, and the stud 340 can pass through the bottom groove 103, the through hole and the top groove 102 in turn and slide along the top groove 102 and the bottom groove 103, and the stud 340 can also move along the through hole, and two locking nuts are screwed on the stud 340 120, the fixing seat is located between the two locking nuts 120, and the positions where the two sides of the top groove 102 and the two sides of the bottom groove 103 intersect with the top surface and the bottom surface of the base 100 are respectively provided with inwardly concave arc surfaces 104, and an outwardly protruding arc ring 121 is provided at one end of the locking nut 120 facing the base 100, and the arc ring 121 matches the arc surface 104, and a locking bolt 130 is installed on the side of the base 100. When the locking bolt 130 is locked, the locking bolt 130 is locked. When the tightening bolt 130 is tightened, the end of the locking bolt 130 can be pressed against the side of the slider 110, thereby locking the position of the slider 110; the lower end of the support foot 300 is bent toward one side of the support foot 300 and is provided with a tip 310, the tip 310 is parallel to the axis of the stud, and a pressing boss 320 is provided at the top of the tip 310, and anti-slip grooves are provided on the pressing boss 320; a first horizontal bubble 140 is provided on the base 100.

[0034] In addition, two mating surfaces 330 are provided between the tip 310 of the support leg 300 and the pressing boss 320. One side of the two mating surfaces 330 intersects and forms an angle of 120 degrees. When the three support legs 300 rotate toward the center of the base 100, the three pairs of mating surfaces 330 can fit together. When the locking bolt 130 is tightened, the three support legs 300 can be prevented from rotating and dispersing.

[0035] The target stand 200 includes an upper stand 210 and a lower stand 220, the lower stand 220 is connected to the base 100 by a connecting bolt 230, the target box 400 includes a box body 410 and a box cover 420, the bottom of the box body 410 is rotatably connected to the upper stand 210 and the rotation axis is perpendicular to the top surface of the upper stand 210, an outer gear ring 412 is installed on the periphery of the bottom of the box body 410, three foot screws 240 are installed between the upper stand 210 and the lower stand 220, and a level bubble is installed on the upper stand 210, and the level can be adjusted when the three foot screws 240 are adjusted. The level of the bubble; a rotatable first worm 211 is installed on one side of the upper seat 210, and the rotation axis of the first worm 211 is horizontally arranged, the first worm 211 is meshed with the outer gear ring 412, and one end of the first worm 211 is fixedly installed with an angle bolt 212, when the angle bolt 212 is rotated, the first worm 211 can be rotated and drive the outer gear ring 412 to drive the box body 410 to rotate; it should be pointed out that the foot screw 240 is a common component used in the level, and its internal structure is common knowledge, which will not be described in detail here.

[0036] An opening 411 is provided on the side of the box body 410, and a driving unit is installed in the box body 410. The driving unit includes: a threaded rod 600, a guide rod 610, a gear 620, a second worm 630 and a height knob 640. The guide rod 610 and the threaded rod 600 are both installed in the box body 410. There are two guide rods 610. The threaded rod 600 is parallel to the guide rod 610 and is located between the two guide rods 610. The lifting block 430 is slidably mounted on the guide rod 610. The threaded rod 600 and the lifting block 430 are screwed together. The gear 620 is fixedly mounted at the lower end of the screw, the second worm 630 is rotatably mounted below the box body 410 and meshes with the gear 620, the rotation axis of the second worm 630 is arranged in a horizontal direction, the height knob 640 is fixedly connected to the end of the second worm 630, when the height knob 640 is rotated, the second worm 630 can be rotated and drive the gear 620 and the threaded rod 600 to rotate, when the threaded rod 600 rotates, it can drive the lifting block 430 to move up and down along the guide rod 610.

[0037] A latch 432 is symmetrically arranged on both sides of the lifting block 430. The latch 432 is a waist-shaped structure and is arranged in a vertical direction. A slide groove 421 is respectively opened on both sides of the box cover 420, and the latch 432 is inserted into the slide groove 421 and can slide along the slide groove 421; a first nail hole 422 and a second nail hole 423 are respectively opened on the top and bottom of the box cover 420, and a screw hole 433 is respectively provided on both sides of the lifting block 430. The position of the screw hole 433 corresponds to the position of the first nail hole 422 and the second nail hole 423. The limiting bolt 431 can pass through the first nail hole 422 or the second nail hole 423 and is threadedly connected to the screw hole 433. An inwardly recessed receiving groove 462 is provided on the side near the lower end of the box cover 420, and a scale positioning plate 460 is installed at the receiving groove 462. The lower end of the scale positioning plate 460 is rotatably connected to the receiving groove 462 Then, when the upper end of the ruler positioning plate 460 is flipped into the receiving groove 462, the ruler positioning plate 460 can be received in the receiving groove 462. When the ruler positioning plate 460 is flipped outward, it can be fixed at a position where the outward turning angle is 90 degrees. At this time, a positioning protrusion 461 is provided on the upward plate surface of the ruler positioning plate 460, and the cross-section of the positioning protrusion 461 is semicircular; a ruler clamping finger 450 is provided on the side near the upper end of the box cover 420, one end of the ruler clamping finger 450 is elastically connected to the box cover 420, and the other end of the ruler clamping finger 450 is bent 90 degrees to one side thereof and is parallel to the side surface of the box cover, and the other end of the ruler clamping finger 450 can be elastically pulled outward, and a rubber sleeve 451 is sleeved on the other end of the ruler clamping finger 450, and the toothed surfaces of rulers of different sizes can be clamped between the rubber sleeve 451 and the side surface of the box cover 420, and the bottom of the ruler abuts against the positioning protrusion 461.

[0038] A mounting sleeve 440 is provided at the lower end of the mouth 411, and the axis of the sleeve hole of the mounting sleeve 440 is consistent with the direction of the guide rod 610. A hexagonal limiting hole 441 is opened on the mounting sleeve 440, and the axis of the limiting hole 441 coincides with the axis of the sleeve hole. A hexagonal dust cap 520 is provided below the dial indicator 500. The interface of the hexagonal dust cap 520 is consistent with the interface of an ordinary dust cap, and the only difference is that its outer circumference is a hexagonal structure. The hexagonal dust cap 520 can be inserted into the limiting hole 441 to limit the axial rotation of the mounting column 510, and a measuring rod 510 is provided in the dial indicator 500; a limiting groove 434 is provided at the bottom of the lifting block 430, and the end of the measuring rod 510 can be stuck in the limiting groove 434.

[0039] Next, the operation method and working principle of a portable high-precision on-site calibration device in this embodiment are described in detail so that those skilled in the art can better understand the present invention: When in use, first level the first horizontal bubble 140 on the base 100. During leveling, first loosen the locking bolt 130, open the three legs 300, and make the tip 310 penetrate into or contact the horizontal surface of the measurement location. First loosen the locking nut 120 located above the base 100, and then adjust the locking nut 120 located below the base 100. After the first horizontal bubble 140 is located at the center, tighten the locking nut 120 located above the base 100 and then tighten the locking bolt 130. Then install the target seat 200 on the base. 100, adjust the three foot screws 240 to make the second horizontal bubble 250 located in the center position; then unscrew the limit bolt 431, slide the box body 410 upwards, align the second nail hole 423 with the screw hole 433, screw the limit bolt 431 into the screw hole 433, fix the box cover 420 in the open position, turn the ruler positioning plate 460 outward, stretch the ruler finger 450 outward, clamp the ruler between the rubber sleeve 451 of the ruler finger 450 and the box cover 420, and make the bottom surface of the ruler abut against the positioning protrusion 461. Turn the angle bolt 212 to rotate the box cover 420 until the side where the scale line of the ruler is located faces the level, then insert the hexagonal dust cap 520 of the dial indicator 500 into the limit hole 441, turn the height knob 640 to adjust the position of the lifting block 430 downward until the end of the measuring rod 510 is inserted into the limit groove 434 and the measuring end of the dial indicator 500 is pressed a certain distance, and then adjust the dial indicator 500 to the initial position δ0.

[0040] The scale lines of the ruler are measured for the first time using the set-up level, and the measurement reading is Z1; then the height knob 640 is turned to adjust the position of the lifting block 430. When the lifting block 430 is raised or lowered, the box cover 420 can also be driven to move up and down. Assuming that the box cover 420 moves downward for a certain distance, the same position of the scale lines of the ruler is measured again using the level, and the measurement reading is Z2. At this time, the reading on the dial indicator 500 is δ1; assuming that Z2-Z1=△, then △-(δ1-δ0) is the indication error of a single measurement; multiple indication errors can be obtained through multiple measurements, and the indication errors can be corrected and judged through data processing.

[0041] After use, remove the ruler, put away the ruler positioning plate 460, turn the height knob 640 to move the lifting block 430 to the highest position, remove the dial indicator 500, then unscrew the limit bolt 431, move the box cover 420 downward to close the mouth 411, at this time, the first nail hole 422 and the screw hole 433 are aligned with each other, and then tighten the limit bolt 431; disassemble the target box 400 and the base 100 from each other, loosen the locking bolt 130, and then rotate the three legs 300 toward the center of the base 100 so that the three mating surfaces 330 fit together and then tighten the locking bolt 130, finally put the dial indicator 500, the base 100, the ruler and the target box 400 away.

[0042] It is worth mentioning that the device and calibration method can also be used in total station height measurement operations.

[0043] In summary, the portable high-precision on-site calibration device in this embodiment can enable the support leg 300 to adapt to different heights and a certain inclination of the ground at the calibration location through the structure of the slider 110 and the rotating block 111 at the connection between the support leg 300 and the base 100, so as to make it more convenient to level the base 100; the target box 400 is made into a split structure of a box body 410 and a box cover 420, and the box cover 420 is used to install the ruler and can move with the lifting block 430. The moving distance of the lifting block 430 can be accurately read by the dial indicator 500, so that the level can be accurately calibrated on-site, and it can be conveniently stored when not in use to protect the driving part in the box body 410, and the target seat 200 and the base 100 are detachable, which is suitable for portable use in outdoor environments.

[0044] The foregoing descriptions of specific exemplary embodiments of the present invention are for the purpose of explanation and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can make modifications, substitutions, variations and various selections and changes to the embodiments without creative contribution as needed without departing from the principles and purpose of the present invention after reading this specification, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A portable high-precision on-site calibration device, comprising a base and a target seat, wherein the base is provided with legs, the target seat is detachably connected to the base, and a target box is provided on the target seat, characterized in that: A slider is provided in the base, and the slider can move radially along the base. A rotating block is embedded in the slider. A stud is provided on the top of the support foot, and the stud passes through the rotating block and is provided with a locking nut. The number of the locking nuts is two and they are respectively in contact with the top surface and the bottom surface of the base; The target box comprises a box body and a box cover, the bottom of the box body is rotatably connected to the target seat and the rotation axis is perpendicular to the top surface of the target seat; a mouth is provided on the side of the box body, and a lifting block is provided on the mouth; a driving part connected to the lifting block is provided in the box body, and the driving part can drive the lifting block to move in a direction parallel to the rotation axis of the box body; the box cover is slidably connected to the lifting block and is limited by a limit bolt; the box cover can cover the mouth, and an openable and closable ruler positioning plate is provided at the lower end of the box cover, a ruler finger is provided at the upper end of the box cover, and a detachable dial indicator is provided at the lower end of the mouth, and the measuring end of the dial indicator faces upward and abuts against the bottom of the lifting block.

2. The portable high-precision on-site calibration device according to claim 1, characterized in that: A sliding cavity is provided on the side of the base, and the sliding block is slidably arranged in the sliding cavity. A top groove and a bottom groove are respectively provided on the top and bottom of the base, and the top groove and the bottom groove are respectively connected to the top and the bottom of the sliding cavity, and the stud can pass through the top groove and the bottom groove and slide along the top groove and the bottom groove.

3. The portable high-precision on-site calibration device according to claim 2, characterized in that: Inwardly concave arc surfaces are respectively arranged on both sides of the top groove and both sides of the bottom groove, and an outwardly protruding arc ring is arranged on one end of the locking nut facing the base, and the arc ring matches the arc surface.

4. The portable high-precision on-site calibration device according to claim 3, characterized in that: A locking bolt is provided on the side of the base, and when the locking bolt is tightened, the end of the locking bolt can tighten the side of the sliding block.

5. The portable high-precision on-site calibration device according to claim 1, characterized in that: The lower end of the support leg is bent toward one side of the support leg and is provided with a tip portion, the tip portion is parallel to the axis of the stud, and a pressing boss is provided at the top end of the tip portion.

6. The portable high-precision on-site calibration device according to claim 1, characterized in that: The target seat includes an upper seat and a lower seat, the lower seat is connected to the base through connecting bolts, the bottom of the box body is rotatably connected to the upper seat and is provided with an outer gear ring, and a foot screw is provided between the upper seat and the lower seat; the base is provided with a first horizontal bubble, and the upper seat is provided with a second horizontal bubble.

7. The portable high-precision on-site calibration device according to claim 6, characterized in that: A rotatable first worm is provided on one side of the upper seat. The first worm is meshed with the outer gear ring, and an angle bolt is provided at one end of the first worm.

8. The portable high-precision on-site calibration device according to claim 1, characterized in that: A bayonet is provided on both sides of the lifting block, and the bayonet is a waist-shaped structure. Slide grooves are provided on both sides of the box cover, and the bayonet is inserted into the slide grooves and can slide along the slide grooves; a first nail hole and a second nail hole are respectively provided on the top and bottom of the box cover, and screw holes are respectively provided on both sides of the lifting block, and the positions of the screw holes correspond to the positions of the first nail hole and the second nail hole, and the limiting bolts are threadedly connected to the screw holes.

9. The portable high-precision on-site calibration device according to claim 1, characterized in that: A mounting sleeve is provided at the lower end of the mouth, a limiting hole is provided on the mounting sleeve, and a hexagonal dust cap is provided below the dial indicator. The hexagonal dust cap can be inserted into the limiting hole to limit the axial rotation of the mounting column.

10. The portable high-precision on-site calibration device according to claim 1, characterized in that: The driving part includes a threaded rod, a guide rod, a gear, a second worm and a height knob. The lifting block is slidably mounted on the guide rod. The threaded rod is parallel to the guide rod and is threadedly connected to the lifting block. The gear is fixedly mounted on the lower end of the screw rod. The second worm is rotatably mounted below the box body and meshes with the gear. The height knob is fixedly connected to the end of the second worm.

Images