A parallactometer

Abstract

The utility model discloses a kind of length comparator, including fixed component, measuring assembly and pedestal, measuring assembly is centrally arranged on pedestal, a pair of two fixed components are located at the left and right sides of measuring assembly, and at least one described fixed component can slide in the left and right directions of the pedestal, to realize the clamping of a pair of fixed components to test piece. Measuring assembly includes fixed seat, micrometer, first support rod and standard bar, one end of first support rod is fixedly connected with pedestal, the other end of first support rod is lockable sliding connection with fixed seat, micrometer is installed on fixed seat, the standard bar is used for zero setting of micrometer, and is set between pedestal and micrometer. Fixed seat can slide in vertical direction, for the measurement of test piece of different height, and fixed seat can be locked relative to first support rod, to be fixed on first support rod, to further realize the measurement of micrometer to test piece height.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, and in particular to a length comparator. Background Technology

[0002] The length comparator is a key instrument for detecting alkali-aggregate reaction and plays a crucial role in the quality control of building materials. It is primarily used to measure the length changes of cement mortar or concrete specimens to assess whether the expansion caused by the reaction between alkali and reactive aggregates in the cement poses a potential hazard. In practical operation, the length comparator is characterized by its simple structure, convenient operation, and accurate and rapid measurement. It can precisely capture subtle changes in specimen length, providing reliable data for assessing the alkali-aggregate reaction.

[0003] When conducting alkali-aggregate reaction tests, specimens need to be immersed in a specific solution for an extended period for observation and measurement. However, due to the lack of reliable fixing devices, specimens are prone to lateral movement during solution immersion and measurement operations. Once the specimen shifts, the measurement point changes, leading to deviations in the acquired length data. This deviation not only affects the accuracy of a single measurement but also interferes with the continuity and regularity of the data, rendering the length change curve recorded throughout the entire test unreliable. Utility Model Content

[0004] The purpose of this invention is to provide a length comparator that can stably clamp the specimen.

[0005] To achieve the above objectives, this utility model proposes a length comparator, comprising a fixing component, a measuring component, and a base. The measuring component is centrally located on the base, and a pair of fixing components are located on the left and right sides of the measuring component. At least one of the fixing components can slide in the left-right direction of the base to clamp the specimen. The measuring component includes a fixed base, a dial indicator, a first support rod, and a standard rod. One end of the first support rod is fixedly connected to the base, and the other end of the first support rod is slidably connected to the fixed base. The dial indicator is mounted on the fixed base, and the standard rod is used for zeroing the dial indicator and is located between the base and the dial indicator.

[0006] Preferably, the fixing component includes a sliding part, and a groove is provided for each sliding part extending in the left and right direction of the base, and the sliding part is slidably connected to the groove.

[0007] Preferably, the sliding part is provided with a threaded hole, and a screw is provided on the base. The screw passes through the sliding grooves on the left and right sides of the base. The two sliding parts are screwed onto the screw, and the sliding parts abut against the bottom of the sliding grooves. The threaded sections of the screw in the left and right sliding grooves rotate in opposite directions, so that the sliding parts and the screw form a screw-nut pair. The screw is provided with a drive motor to drive the screw to rotate so that the two sliding parts can move closer to each other or further away from each other.

[0008] Preferably, the fixing component includes a clamping part and at least one second support rod. The two clamping parts disposed on a pair of fixing components cooperate to clamp the specimen. The clamping part and the sliding part are connected through the second support rod. The second support rod is fixedly connected to the sliding part so that the sliding part drives the clamping part to slide in the left and right direction of the base, so as to clamp the specimen in different states.

[0009] Preferably, the clamping part includes a fixed plate and a sliding plate. The fixed plate is close to the sliding part and fixedly connected to the second support rod. The sliding plate is disposed above the fixed plate and is slidably connected to the second support rod in a lockable manner, so as to achieve clamping of specimens of different heights and sizes.

[0010] Preferably, a first self-locking bolt is provided on the fixed seat to lock the fixed seat on the first support rod, and a second self-locking bolt is provided on the sliding plate to lock the sliding plate on the second support rod.

[0011] Preferably, the clamping part is further provided with a pressure block and a pressure sensor. The pressure block is used to press the specimen, and the pressure sensor is used to monitor the pressure between the pressure block and the specimen. The comparator is also provided with a controller, and the controller is signal-locked with the pressure sensor.

[0012] Preferably, the fixed plate is provided with a first clearance portion and the sliding plate is provided with a second clearance portion, the first clearance portion and the second clearance portion being used to clearance the first support rod.

[0013] Preferably, the two first support rods and the fixed base are lockable sliding connections at both ends along their length.

[0014] The beneficial effects of this utility model are as follows:

[0015] The length comparator proposed in this utility model includes a fixing component, a measuring component, and a base. A pair of fixing components are symmetrically arranged on both sides of the base in the left-right direction. The fixing components can slide in the left-right direction of the base to achieve clamping of the specimen by the pair of fixing components, so as to avoid lateral movement during the measurement operation and thus avoid deviation of the measurement data.

[0016] The measuring assembly includes a fixed base, a dial indicator, a first support rod, and a standard rod. The dial indicator is positioned in the middle of the fixed base, and the standard rod is positioned between the base and the dial indicator for calibration. The first support rods are symmetrically positioned at both ends of the fixed base, and the fixed base is supported by a pair of first support columns at both ends. The first support rods and the fixed base are locked together by a sliding connection. The fixed base can slide vertically to measure specimens of different heights, and it can also be locked relative to the first support rods to secure it, thereby enabling the dial indicator to measure the height of the specimen. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the length comparator in a preferred embodiment of the present invention (angle 1);

[0018] Figure 2 This is a schematic diagram of the length comparator in a preferred embodiment of the present invention (angle two). Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] See Figure 1-2 As shown, in a preferred embodiment of the present invention, a length comparator is proposed, including a base 1, a measuring component 2 and a fixing component 3. The measuring component 2 is centrally located on the base 1, and a pair of fixing components 3 are located on the left and right sides of the measuring component 2. The measuring component 2 is used to measure the height of the specimen.

[0022] The measuring component 2 includes a dial indicator 21, a fixed base 22, a first support rod 23, and a standard rod 24. The dial indicator 21 and standard rod 24 can be commercially available products conforming to national standards. One end of the first support rod 23 is fixedly connected to the base 1, and the other end of the first support rod 23 is slidably connected to the fixed base 22 in the vertical direction. Two first support rods 23 are symmetrically arranged at both ends of the fixed base 22 along its length. Both first support rods 23 slide vertically with the fixed base 22 simultaneously, thereby adjusting the height of the fixed base 22. A first self-locking bolt 221 is provided on the fixed base 22 to achieve a lockable fixed connection between the fixed base 22 and the first support rod 23. By rotating the first self-locking bolt 221, the fixed base 22 can be locked onto the first support rod 23, or the fixed base 22 can be released to allow it to slide again on the first support rod 23. A dial indicator 21 is positioned in the middle of the fixed base 22, and a standard rod 24 is positioned between the base 1 and the dial indicator 21. The standard rod 24 can be assembled between the base 1 and the dial indicator 21 to calibrate / zero the dial indicator 21, or it can be removed from between the base 1 and the dial indicator 21 during measurement to make room for the test piece. The dial indicator contacts the test piece through its probe, amplifying the minute linear displacement through an internal lever or gear mechanism, and displaying the reading on the dial by a pointer, thereby achieving high-precision measurement of dimensional deviations or form and position errors. The standard rod 24 serves as a reference piece with a known precise length, used to zero the dial indicator 21 before measurement, making it reference to a standard size, and then measuring the actual deviation of the test piece relative to the standard rod 24 through a comparison method. During the measurement process, the dial indicator 21 slides up and down on the first support rod 23 by sliding the fixed base 22 up and down along the vertical direction of the first support rod 23, clamping the upper and lower ends of the specimen between the dial indicator 21 and the base 1. The position of the fixed base 22 is fixed by the first self-locking bolt, thereby fixing the measuring position of the dial indicator 21, avoiding measurement errors, and thus realizing the measurement of specimens of different height dimensions by the dial indicator 21.

[0023] The fixing component 3 is slidably connected to the base 1. More specifically, the pair of fixing components 3 can slide in the length direction of the base 1 (i.e., the left and right direction of the base) and move closer / away from each other to achieve the clamping of the specimen by the pair of fixing components 3.

[0024] The fixing component 3 includes a sliding part 31 with a threaded hole. A screw 12 is provided in the left-right direction of the base 1, and a sliding groove 11 is provided at both ends of the base 1 in the left-right direction. The sliding part 31 is placed in the sliding groove 11, and the lower end of the sliding part 31 abuts against the bottom of the groove 11. The sliding part 31 can slide in the left-right direction of the base 1. The screw 12 passes through the two sliding grooves 11 on the left and right sides of the base 1 and is screwed into the threaded hole on the two sliding parts 31 on the two sides of the base 1, so that the sliding part 31 and the screw 12 form a screw-nut pair. A drive motor 13 connected to a screw 12 is provided on the base 1 to drive the screw 12 to rotate in the forward / reverse direction. The screw 12 passes through two sliding grooves 11 at both ends of the base 1. The two threaded sections of the screw 12 have opposite directions of rotation, so that the two sliding parts 31 screwed to the two threaded sections with opposite directions of rotation can move closer / away from each other in the left-right direction of the base 1, thereby realizing the synchronous clamping or opening of a pair of fixing components 3 to clamp specimens of different widths. During the measurement process, the left and right ends of the specimen are clamped and fixed by a pair of fixing components 3 to prevent the specimen from shifting during the measurement of the specimen length by the measuring component 2, which would cause measurement errors. In other embodiments, the movement of a pair of fixing components 3 towards / away from each other in the left-right direction of the base 1 can also be achieved by an electric slide rail provided on the base 1.

[0025] The fixing component 3 also includes a clamping part 32 and two second support rods 33. The second support rods 33 extend vertically, and the lower end of the second support rods 33 is fixedly connected to the sliding part 31. The clamping part 32 includes a sliding plate 322 and a fixing plate 321. Both the sliding plate 322 and the fixing plate 321 are sleeved on the second support rods 33. The fixing plate 321 is disposed opposite to the sliding plate 322 and is fixedly connected to the second support rod 33. The sliding plate 322 and the second support rod 33 are slidably connected.

[0026] A second self-locking bolt 325 is provided on the sliding plate 322 to fix the sliding plate 322 to a suitable position on the second support rod 33, so as to realize the clamping part 32 clamping specimens of different heights and dimensions, and to realize the flexible adjustment of the clamping height of the clamping part 32. Of course, in other embodiments, the fixing plate may not be provided, and the specimen may be clamped only by the sliding plate. The left and right sides of the specimen are clamped and fixed by the clamping part 32 to prevent the specimen from sliding in the horizontal direction during the measurement of the specimen by the measuring component 2.

[0027] The clamping part 32 is provided with a clamping block 34. The clamping block 34 is a block-shaped structure protruding from the fixed plate 321 / sliding plate 322 toward the inner side of the two fixed components 3. The fixed plate 321 / sliding plate 322 clamps the left and right sides of the specimen through the clamping block 34 to achieve stable clamping of the specimen. The clamping block 34 is replaceable. When the length comparator is used for a certain period of time and the clamping block 34 wears out, only the worn clamping block 34 needs to be replaced, without replacing the entire sliding plate 322, thus reducing repair costs.

[0028] To prevent the two clamping parts 32 from being at their limit distance during the approaching stroke of the two fixed components 3 driven by the drive motor 13, which would cause excessive pressure on the specimen and damage it, a pressure sensor 35 is provided on the pressure block 34 in this embodiment. The pressure sensor 35 on the pressure block 34 is signal-locked with the controller 14 set on the comparator. More specifically, in this embodiment, the drive motor 13, controller 14, and pressure sensor 35 are all signal-locked. The pressure sensor 35 monitors the pressure between the pressure block 34 and the specimen, controls the distance between the two clamping parts 32, ensures that the pressure block 34 and the specimen are in full contact, and avoids the distance between the clamping parts 32 being too close, which would cause excessive clamping pressure and damage to the specimen, thus improving the stability of the device.

[0029] Meanwhile, in order to accommodate smaller specimens and avoid being limited by the first support rod 23 when the two clamping parts 32 are close to each other, a first clearance part 323 is provided on the fixed plate 321 and a second clearance part 324 is provided on the sliding plate 322. The first clearance part 323 and the second clearance part 324 are used to make way for the first support rod 23.

[0030] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A length comparator, characterized in that, The device includes a fixing component, a measuring component, and a base. The measuring component is centrally located on the base, and a pair of fixing components are located on the left and right sides of the measuring component. At least one of the fixing components is capable of sliding in the left-right direction of the base to clamp the specimen with the pair of fixing components. The measuring assembly includes a fixed base, a dial indicator, a first support rod, and a standard rod. One end of the first support rod is fixedly connected to the base, and the other end of the first support rod is slidably connected to the fixed base. The dial indicator is mounted on the fixed base, and the standard rod is used for zeroing the dial indicator and is located between the base and the dial indicator.

2. The length comparator according to claim 1, characterized in that, The fixing component includes a sliding part, and a sliding groove is provided for each sliding part extending in the left and right direction of the base, and the sliding part is slidably connected to the sliding groove.

3. The length comparator according to claim 2, characterized in that, The sliding part is provided with a threaded hole, and a screw is provided on the base. The screw passes through the sliding grooves on the left and right sides of the base. The two sliding parts are screwed onto the screw, and the sliding parts abut against the bottom of the sliding groove. The threaded sections of the screw in the left and right sliding grooves rotate in opposite directions, so that the sliding parts and the screw form a screw-nut pair. The screw is provided with a drive motor to drive the screw to rotate so that the two sliding parts can move closer to each other or further away from each other.

4. The length comparator according to claim 2, characterized in that, The fixing component includes a clamping part and at least one second support rod. The two clamping parts disposed on a pair of fixing components cooperate to clamp the specimen. The clamping part and the sliding part are connected by the second support rod. The second support rod is fixedly connected to the sliding part so that the sliding part drives the clamping part to slide in the left and right direction of the base, so as to clamp the specimen in different states.

5. The length comparator according to claim 4, characterized in that, The clamping part includes a fixed plate and a sliding plate. The fixed plate is close to the sliding part and fixedly connected to the second support rod. The sliding plate is located above the fixed plate and is slidably connected to the second support rod in a lockable manner, so as to achieve clamping of specimens of different heights and sizes.

6. The length comparator according to claim 5, characterized in that, A first self-locking bolt is provided on the fixed seat to lock the fixed seat on the first support rod, and a second self-locking bolt is provided on the sliding plate to lock the sliding plate on the second support rod.

7. The length comparator according to claim 4, characterized in that, The clamping part is also equipped with a pressure block and a pressure sensor. The pressure block is used to press the specimen, and the pressure sensor is used to monitor the pressure between the pressure block and the specimen. The comparator is also equipped with a controller, which is signal-locked with the pressure sensor.

8. The length comparator according to claim 5, characterized in that, The fixed plate is provided with a first clearance portion and the sliding plate is provided with a second clearance portion, the first clearance portion and the second clearance portion are used to clearance the first support rod.

9. The length comparator according to claim 1, characterized in that, The two first support rods and the fixed base are lockable sliding connections at both ends along their length.

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