A height measuring device

Abstract

The utility model provides a height measuring device belongs to measuring device technical field, this height measuring device, including measuring main part, sliding rod, fixed base, measuring arm, scale display subassembly, fixed base is rectangular frame, and is equipped with support foot in four corners and sticks antiskid pad, measuring main part is cylindrical, and the bottom is fixed in the base center with screw thread, aluminium alloy sliding rod is along the axial sliding in the main part, L shape measuring arm short end fixed link sliding rod top, long end horizontal extension, scale subassembly contains vertical caliper rule and the indicating block of sliding rod movement, and is equipped with elastic reset mechanism between sliding rod and main part, reset spring cover rod outside, and the guide sleeve is fixed in the main part inner wall and leads linear motion, the utility model can solve the technical problem that the existing technique has the height measuring device structure complex, the measuring precision is unstable, the operation is complicated and is susceptible to the environmental temperature influence and leads to the technical problem that the measurement result is not accurate.

Description

Technical Field

[0001] This utility model belongs to the field of measuring device technology, and more specifically, relates to a height measuring device. Background Technology

[0002] In modern industrial production and scientific research, height measurement is a fundamental and crucial technical task, widely applied in numerous fields such as machinery manufacturing, construction, quality inspection, and product design. Traditional height measurement methods mainly include vernier calipers, micrometers, and height gauges. While these methods can meet measurement needs to a certain extent, they have many limitations. Vernier calipers are inconvenient to operate when measuring large heights, have a limited measuring range, and their reading accuracy is easily affected by the operator's viewing angle and lighting conditions. Micrometers, while highly accurate, have an even more limited measuring range, primarily suitable for measuring small parts. Traditional height gauges have complex structures, containing multiple precision components, resulting in high manufacturing costs, difficult maintenance, and susceptibility to measurement errors due to changes in ambient temperature. Existing height measuring devices generally suffer from complex structures, numerous components, difficult adjustments, and unstable accuracy, especially when used in environments with significant temperature variations, where thermal expansion and contraction significantly affect measurement accuracy. Furthermore, existing devices have high frictional resistance in their sliding parts, resulting in poor operating feel and a tendency to wear and jam after prolonged use. In practical applications, operators often need to repeatedly adjust and calibrate, increasing operational complexity and time costs. In response to these technical challenges, the industry urgently needs a height measurement device that is simple in structure, easy to operate, has stable accuracy, and is highly adaptable to various environments. Utility Model Content

[0003] In view of this, the present invention provides a height measuring device that can solve the technical problems of existing height measuring devices having complex structures, unstable measurement accuracy, cumbersome operation, and being easily affected by ambient temperature, resulting in inaccurate measurement results.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a height measuring device, comprising: a measuring body, a sliding rod, a fixed base, a measuring arm, and a scale display assembly; the fixed base has a rectangular frame structure, with support feet at each of the four corners, and anti-slip pads at the bottom of the support feet; the measuring body has a cylindrical structure, with its bottom fixedly installed at the center of the fixed base via a threaded connection; the sliding rod has a slender cylindrical structure, made of aluminum alloy, and slides along the axis of the measuring body inside the measuring body; the measuring arm has an L-shaped structure, with its short end fixedly connected to the top of the sliding rod, and its long end extending horizontally; the scale display assembly includes a scale and an indicator block, the scale being longitudinally arranged along the outer wall of the measuring body, and the indicator block being fixedly connected to the sliding rod and sliding along the scale; an elastic reset mechanism is provided between the sliding rod and the measuring body, the elastic reset mechanism including a reset spring and a guide sleeve, the reset spring being sleeved around the sliding rod, and the guide sleeve being fixed to the inner wall of the measuring body to guide the linear movement of the sliding rod.

[0006] The technical advantages of the height measuring device provided by this utility model are as follows: Precise positioning of the height measurement is achieved through the cooperative structure of the measuring body and the sliding rod; the linear sliding motion of the sliding rod inside the measuring body ensures the accuracy of the measurement; the L-shaped measuring arm design allows the measuring contact surface to stably contact the object being measured; the elastic reset mechanism ensures that the sliding rod can automatically reset after measurement; and the scale display component achieves intuitive height reading display through the cooperation of the indicator block and the scale. The overall structure is simple and reliable, and the measurement accuracy is high.

[0007] Based on the above technical solution, the height measuring device of this utility model can be further improved as follows:

[0008] The measuring body includes an outer cylinder and an inner cylinder. The outer cylinder has a cylindrical structure and is made of stainless steel. The inner diameter of the outer cylinder is 30 mm to 50 mm. The inner cylinder has a cylindrical structure and is coaxially arranged inside the outer cylinder, forming an annular gap between the inner and outer cylinders. The sliding rod passes through the inner cylinder. A lubrication mechanism is provided between the sliding rod and the inner wall of the inner cylinder. The lubrication mechanism includes a lubricating ring and grease. The lubricating ring is fixed on the inner wall of the inner cylinder, and the grease is coated on the contact surface between the sliding rod and the lubricating ring.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the double-layer structure design of the outer cylinder and the inner cylinder enhances the structural stability of the measuring device; the inner cylinder provides precise guidance for the sliding rod; the design of the annular gap avoids the influence of external interference on the measurement accuracy; the setting of the lubrication mechanism reduces the frictional resistance between the sliding rod and the inner cylinder, improves the smoothness of sliding and the accuracy of measurement; and the selection of stainless steel material ensures the corrosion resistance and service life of the device.

[0010] Furthermore, the fixed base includes a base plate and a support column; the base plate has a square structure with a side length of 200 mm to 300 mm, and the base plate is made of cast iron; the support column has a cylindrical structure and is vertically fixed at the center of the base plate, and the top of the support column is provided with a threaded hole that is threaded to the bottom of the measuring body; the outer diameter of the support column is 1.5 to 2 times the outer diameter of the measuring body, and the height of the support column is 50 mm to 80 mm.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the square structure of the base plate provides a stable support surface, effectively preventing the device from tilting and shaking during the measurement process; the cylindrical design of the support column forms a good fit with the measurement body; the threaded connection method ensures the firmness of the connection; the selection of cast iron material increases the weight and stability of the base; and the size design of the support column ensures the overall structural proportion coordination and mechanical strength.

[0012] Furthermore, the measuring arm includes a horizontal arm and a vertical arm; the horizontal arm has a straight structure, a length of 150 mm to 250 mm, a rectangular cross-section, and is made of aluminum alloy; the vertical arm has a straight structure, and is vertically fixedly connected to the horizontal arm to form an L-shaped structure, with a length of 20 mm to 40 mm; the bottom end of the vertical arm is provided with a contact surface, which has a planar structure and a surface roughness of 0.8 μm to 1.6 μm.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the structural design of the L-shaped measuring arm allows the measuring contact surface to make perpendicular contact with the surface of the object being measured; the length design of the horizontal arm ensures full coverage of the measurement range; the rectangular cross-section of the horizontal arm has good bending strength; the selection of aluminum alloy material takes into account the balance between strength and weight; and the planar structure and surface roughness control of the contact surface at the bottom of the vertical arm ensure the stability and accuracy of the measurement contact.

[0014] Furthermore, the scale has a strip-shaped structure and is longitudinally attached to the outer wall of the measuring body. The scale is made of stainless steel and has millimeter graduations and numerical markings.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the strip-shaped scale design facilitates reading and observation; the layout along the longitudinal direction of the measuring body is consistent with the movement direction of the sliding rod; the stainless steel material ensures the wear resistance and clarity of the scale; the design of millimeter scale lines and digital markings provides accurate measurement reading display; and the adhesive installation method simplifies the assembly process and ensures the positional accuracy of the scale.

[0016] Furthermore, the indicator block has a ring structure and is arranged around the sliding rod. The inner diameter of the indicator block is in close fit with the outer diameter of the sliding rod. An indicator line is provided on the outer side of the indicator block, and the indicator line is aligned with the scale line on the scale. The indicator block and the sliding rod are fixedly connected by a key connection. The key has a rectangular structure, is made of stainless steel, and is embedded in the keyway on the outer wall of the sliding rod.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of the ring indicator block ensures a tight fit with the sliding rod; the alignment design of the indicator line and the scale line provides accurate reading indication; the key connection method ensures the reliability of the fixed connection between the indicator block and the sliding rod and prevents relative slippage during the measurement process; the choice of stainless steel key material ensures the strength and durability of the connection; and the keyway design achieves precise positioning and fixation.

[0018] Furthermore, the outer wall of the measuring body is provided with multiple heat dissipation grooves, which are distributed in a spiral structure along the outer wall of the measuring body.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the spiral heat dissipation groove increases the heat dissipation area of ​​the measuring body, effectively preventing heat accumulation during long-term use. The spiral structure ensures heat dissipation effect without affecting the structural strength of the measuring body. The distribution design of multiple heat dissipation grooves achieves uniform heat dissipation and improves the measurement stability of the device under different temperature environments.

[0020] Furthermore, the outer surface of the sliding rod is provided with multiple longitudinal grooves, which have a V-shaped cross-sectional structure.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the longitudinal groove reduces the contact area between the sliding rod and the inner cylinder, thereby reducing frictional resistance; the V-shaped cross-section structure maintains good guiding performance while reducing the contact area; and the setting of multiple longitudinal grooves forms a uniform distribution of lubricating oil film, further improving the smoothness of sliding and the accuracy of measurement.

[0022] Furthermore, the upper surface of the horizontal arm of the measuring arm is provided with multiple anti-slip textures, which are in the form of a grid structure.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the design of the grid-like anti-slip texture increases the friction coefficient of the measuring arm surface, prevents hand slippage during operation, and improves the safety and accuracy of operation. The arrangement of the texture design on the upper surface of the horizontal arm does not affect the measurement function, and the grid-like structure has good anti-slip effect and wear resistance.

[0024] Furthermore, the depth of the heat dissipation groove is 2 mm to 5 mm, and the plurality of heat dissipation grooves are equidistantly spirally distributed on the outer wall of the measuring body.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the precise control of the depth of the heat dissipation groove ensures the heat dissipation effect without affecting the structural strength of the measuring body; the equidistant spiral distribution design achieves the uniformity of the heat dissipation effect and avoids local overheating; the setting of the depth range is based on the balance between heat dissipation requirements and structural strength, which improves the overall performance and reliability of the device.

[0026] Compared with existing technologies, the advantages of the height measuring device provided by this utility model are as follows: This utility model achieves high-precision height measurement by employing a precise fit structure between the measuring body and the sliding rod, combined with an elastic reset mechanism and a scale display component. The double-layer cylindrical structure effectively isolates external interference, the lubrication mechanism significantly reduces frictional resistance, and the optimized design of the L-shaped measuring arm ensures the stability of the measurement contact. The innovative design of the spiral heat dissipation groove and longitudinal groove solves the temperature influence problem, and the grid-like anti-slip texture improves operational safety. The overall structure simplifies the measurement process, improves measurement efficiency, reduces human error, and has good environmental adaptability and reliability. Compared with existing technologies, this utility model has significant improvements in measurement accuracy, ease of operation, structural stability, and environmental adaptability, providing a simple, reliable, high-precision, and highly adaptable technical solution for the field of height measurement. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a height measuring device;

[0029] Figure 2 A masked image of a height measuring device;

[0030] Figure 3 A cross-sectional view of a sliding rod and an elastic reset structure for a height measuring device;

[0031] Figure 4 A schematic diagram of the top of a sliding rod and an elastic reset structure for a height measuring device;

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Measuring body; 11. Inner cylinder; 12. Outer cylinder; 2. Sliding rod; 3. Fixed base; 4. Measuring arm; 5. Scale display assembly; 6. Elastic reset mechanism; 61. Reset spring; 62. Guide sleeve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] like Figures 1-4 The diagram shows a first embodiment of a height measuring device provided by this utility model. In this embodiment, it includes: a measuring body 1, a sliding rod 2, a fixed base 3, a measuring arm 4, and a scale display assembly 5. The fixed base 3 has a rectangular frame structure, with support feet at each of its four corners and anti-slip pads at the bottom of the support feet. The measuring body 1 has a cylindrical structure, and its bottom is fixedly installed at the center of the fixed base 3 via a threaded connection. The sliding rod 2 has a slender cylindrical structure, is made of aluminum alloy, and slides along the axial direction of the measuring body 1. Inside the measuring body 1, the measuring arm 4 has an L-shaped structure. The short end of the measuring arm 4 is fixedly connected to the top of the sliding rod 2, and the long end of the measuring arm 4 extends horizontally. The scale display component 5 includes a scale and an indicator block. The scale is set longitudinally along the outer wall of the measuring body 1, and the indicator block is fixedly connected to the sliding rod 2 and slides along the scale. An elastic reset mechanism 6 is provided between the sliding rod 2 and the measuring body 1. The elastic reset mechanism 6 includes a reset spring 61 and a guide sleeve 62. The reset spring 61 is sleeved around the sliding rod 2, and the guide sleeve 62 is fixed on the inner wall of the measuring body 1 to guide the linear movement of the sliding rod 2.

[0036] In the above technical solution, the measuring body 1 includes an outer cylinder 12 and an inner cylinder 11; the outer cylinder 12 has a cylindrical structure, the material of the outer cylinder 12 is stainless steel, and the inner diameter of the outer cylinder 12 is 30 mm to 50 mm; the inner cylinder 11 has a cylindrical structure, and the inner cylinder 11 is coaxially arranged inside the outer cylinder 12, forming an annular gap between the inner cylinder 11 and the outer cylinder 12; the sliding rod 2 passes through the inner cylinder 11, and a lubrication mechanism is provided between the sliding rod 2 and the inner wall of the inner cylinder 11. The lubrication mechanism includes a lubricating ring and lubricating grease. The lubricating ring is fixed on the inner wall of the inner cylinder 11, and the lubricating grease is coated on the contact surface between the sliding rod 2 and the lubricating ring.

[0037] Furthermore, in the above technical solution, the fixed base 3 includes a base plate and a support column; the base plate has a square structure with a side length of 200 mm to 300 mm, and the base plate is made of cast iron; the support column has a cylindrical structure and is vertically fixed at the center of the base plate, and the top of the support column is provided with a threaded hole, which is connected to the bottom thread of the measuring body 1; the outer diameter of the support column is 1.5 to 2 times the outer diameter of the measuring body 1, and the height of the support column is 50 mm to 80 mm.

[0038] Furthermore, in the above technical solution, the measuring arm 4 includes a horizontal arm and a vertical arm; the horizontal arm has a straight structure, a length of 150 mm to 250 mm, a rectangular cross-section, and is made of aluminum alloy; the vertical arm has a straight structure, and is vertically fixedly connected to the horizontal arm to form an L-shaped structure, with a length of 20 mm to 40 mm; the bottom end of the vertical arm is provided with a contact surface, which has a planar structure and a surface roughness of 0.8 μm to 1.6 μm.

[0039] Furthermore, in the above technical solution, the scale is a strip-shaped structure, and the scale is attached longitudinally along the outer wall of the measuring body 1. The scale is made of stainless steel and has millimeter graduations and numerical markings.

[0040] Furthermore, in the above technical solution, the indicator block has a ring structure and is arranged around the sliding rod 2. The inner diameter of the indicator block is in close fit with the outer diameter of the sliding rod 2. An indicator line is provided on the outer side of the indicator block and is aligned with the scale line on the scale. The indicator block and the sliding rod 2 are fixedly connected by a key connection. The key has a rectangular structure and is made of stainless steel. The key is embedded in the keyway on the outer wall of the sliding rod 2.

[0041] Furthermore, in the above technical solution, the outer wall of the measuring body 1 is provided with multiple heat dissipation grooves, which are distributed along the outer wall of the measuring body 1 in a spiral structure.

[0042] Furthermore, in the above technical solution, the outer surface of the sliding rod 2 is provided with multiple longitudinal grooves, and the longitudinal grooves have a V-shaped cross-sectional structure.

[0043] Furthermore, in the above technical solution, the upper surface of the horizontal arm of the measuring arm 4 is provided with multiple anti-slip textures, which are in the form of a grid structure.

[0044] Furthermore, in the above technical solution, the depth of the heat dissipation groove is 2 mm to 5 mm, and multiple heat dissipation grooves are equidistantly spirally distributed on the outer wall of the measuring body 1.

[0045] The following is a specific embodiment of this utility model: The height measuring device in this embodiment mainly consists of five core components: a measuring body, a sliding rod, a fixed base, a measuring arm, and a scale display assembly. The measuring body adopts a double-layer cylindrical structure. The outer cylinder is made of 304 stainless steel, with an outer diameter of 45 mm, an inner diameter of 35 mm, and a wall thickness of 5 mm. The surface is precision machined, and the surface roughness is controlled within 0.4 micrometers. The inner cylinder is also made of 304 stainless steel, with an outer diameter of 33 mm and an inner diameter of 25 mm. It is coaxially installed with the outer cylinder, forming a 4 mm annular gap between them. The total length of the measuring body is 300 mm, and the bottom is provided with an M20 thread for connection with the fixed base. The sliding rod is made of 2024 aluminum alloy, with a diameter of 24 mm and a length of 350 mm. The surface is anodized, and the hardness reaches HV120 or higher. Eight longitudinal grooves are evenly distributed on the surface of the sliding rod, with a groove depth of 1 mm and a V-shaped cross-section with an included angle of 60 degrees. The fixed base consists of a base plate and supporting columns. The base plate is made of HT250 gray cast iron, measuring 250 mm × 250 mm × 30 mm and weighing approximately 15 kg. It has four 50 mm diameter circular support feet at the corners, with nitrile rubber anti-slip pads attached to the bottom of each foot. The supporting columns are cylindrical, 80 mm in diameter and 60 mm high, with an M20 threaded hole at the top, thread accuracy grade 6H. The measuring arms have an L-shaped design. The horizontal arm is 200 mm long with a rectangular cross-section of 15 mm × 8 mm, and the vertical arm is 30 mm long with a square cross-section of 15 mm × 15 mm. Both are made of 6061 aluminum alloy with a sandblasted surface. The bottom contact surface of the vertical arm is precision ground, with a flatness controlled within 0.005 mm and a surface roughness of 1.2 micrometers. The scale display assembly includes a stainless steel scale and an indicator block. The scale is 0.5 mm thick, 20 mm wide, and 280 mm long, with a scale accuracy of 0.5 mm, and is laser-engraved. The indicator block is made of brass, with an outer diameter of 40 mm, an inner diameter of 24.5 mm, and a thickness of 8 mm. It is connected to the sliding rod via a 4 mm × 4 mm square key. The lubrication mechanism uses a PTFE lubricating ring and molybdenum disulfide grease. The lubricating ring is 2 mm thick, with an inner diameter of 25 mm and an outer diameter of 33 mm, and the grease filling volume is 5 ml. The return spring of the elastic reset mechanism is made of 65Mn spring steel, with a free length of 100 mm, a compressed length of 40 mm, and a spring constant of 2 N / mm. The guide sleeve is made of bronze. The heat dissipation groove has a spiral structure with a pitch of 20 mm, a depth of 3 mm, a width of 5 mm, and a total length of 1500 mm. The device works by sliding the sliding rod upward inside the measuring body when the operator lifts the measuring arm. The indicator block moves accordingly. When the measuring arm contacts the object being measured, the sliding rod stops moving, and the position of the indicator block on the scale indicates the height of the object being measured.The measuring range is 0 to 250 mm, with a measurement accuracy of ±0.1 mm and a repeatability accuracy of ±0.05 mm. The device weighs 18 kg and has dimensions of 250 mm × 250 mm × 400 mm. It is suitable for temperatures ranging from -10℃ to 60℃. This compact device is easy to operate, offers high measurement accuracy, and is highly adaptable to various environments, making it suitable for various industrial measurement applications. It is particularly advantageous on production lines where frequent measurement of objects at different heights is required. The lubrication system design ensures smooth sliding rod movement, low frictional resistance, and a good operating feel, maintaining good measurement accuracy even after long-term use. The heat dissipation design effectively addresses the impact of temperature changes on measurement accuracy, ensuring the device's measurement stability under different temperature conditions.

[0046] Specifically, the principle of this invention is as follows: Based on precision mechanical structure design and tribological principles, this invention achieves high-precision height measurement by optimizing the fit and lubrication conditions of the sliding pairs. The double-layer cylindrical structure of the measuring body forms a stable guiding system. The inner cylinder provides precise linear guidance for the sliding rod, and the annular gap between the outer and inner cylinders effectively isolates the influence of external vibration and temperature changes. The lubrication mechanism between the sliding rod and the inner cylinder adopts a combination design of lubricating ring and grease. The lubricating ring provides a uniform lubricating oil film, and the grease fills the micro-gap, significantly reducing the coefficient of friction and sliding resistance. The elastic reset mechanism utilizes the elastic potential energy of the spring to achieve automatic reset of the sliding rod, ensuring the repeatability and consistency of the measurement. The spiral heat dissipation groove, based on the principle of heat conduction, increases the heat dissipation surface area, accelerates the transfer and dissipation of heat, and effectively reduces the impact of temperature changes on measurement accuracy. The longitudinal groove on the surface of the sliding rod adopts a V-shaped cross-section design, which reduces the contact area and frictional resistance while ensuring guiding accuracy, and simultaneously forms an oil film storage space, improving lubrication conditions. The L-shaped measuring arm is designed based on the principle of mechanical balance. The vertical arm bears the measuring force, while the horizontal arm provides stable support, ensuring structural stability during the measurement process. The scale display system provides intuitive readings through the cooperation of the indicator block and the scale. The ring structure of the indicator block ensures synchronous movement with the sliding rod, and the keyed connection ensures reliable connection. The entire device works by using the precise sliding of the sliding rod within the measuring body to move the measuring arm up and down. When the measuring arm contacts the object being measured, the sliding rod stops moving, and the position of the indicator block on the scale at this point indicates the height of the object.

[0047] The specific operation or use method of this utility model is as follows: First, place the height measuring device on a stable workbench, ensuring that the support feet of the fixed base are in full contact with the table surface, and that the anti-slip pad provides stability. Check if the sliding rod is in the lowest position. If not, gently lift the measuring arm upwards. After releasing, the sliding rod will automatically return to its initial position under the action of the elastic reset mechanism. Place the object to be measured next to the fixed base, ensuring that the object surface is clean and its position is stable. Hold the horizontal arm of the measuring arm and slowly lift it upwards, allowing the sliding rod to slide smoothly inside the measuring body. Observe the movement of the indicator block along the scale. When the contact surface of the bottom of the vertical arm of the measuring arm just contacts the surface of the object to be measured, stop lifting. At this point, the sliding rod has reached the measuring position. Read the value corresponding to the indicator line on the scale. This value is the height of the object to be measured. When reading the value, keep your line of sight perpendicular to the scale to avoid reading errors caused by viewing angle deviation. After the measurement is completed, gently lift the measuring arm upwards to remove it from the object to be measured, and then release the measuring arm. The sliding rod will automatically return to its initial position under the action of the elastic reset mechanism. If multiple measurements are required, repeat the above operation steps. During use, keep the device clean and check the lubrication condition of the lubrication mechanism regularly, adding grease as needed. When not in use for extended periods, store the device in a dry environment, avoiding the effects of moisture and corrosive gases.

Claims

1. A height measuring device, characterized in that, include: The system comprises a measuring body, a sliding rod, a fixed base, a measuring arm, and a scale display assembly. The fixed base has a rectangular frame structure with support feet at each of its four corners, and anti-slip pads at the bottom of the support feet. The measuring body has a cylindrical structure, with its bottom fixedly mounted at the center of the fixed base via a threaded connection. The sliding rod has a slender cylindrical structure made of aluminum alloy and slides along the axis of the measuring body inside the body. The measuring arm has an L-shaped structure, with its short end fixedly connected to the top of the sliding rod and its long end extending horizontally. The scale display assembly includes a scale and an indicator block. The scale is longitudinally positioned along the outer wall of the measuring body, and the indicator block is fixedly connected to the sliding rod and slides along the scale. An elastic reset mechanism is provided between the sliding rod and the measuring body. The elastic reset mechanism includes a reset spring and a guide sleeve. The reset spring is sleeved around the sliding rod, and the guide sleeve is fixed to the inner wall of the measuring body to guide the linear movement of the sliding rod.

2. The height measuring device according to claim 1, characterized in that, The measuring body includes an outer cylinder and an inner cylinder; the outer cylinder has a cylindrical structure, is made of stainless steel, and has an inner diameter of 30 mm to 50 mm; the inner cylinder has a cylindrical structure and is coaxially arranged inside the outer cylinder, forming an annular gap between the inner and outer cylinders; the sliding rod passes through the inner cylinder, and a lubrication mechanism is provided between the sliding rod and the inner wall of the inner cylinder, the lubrication mechanism including a lubrication ring and grease, the lubrication ring being fixed on the inner wall of the inner cylinder, and the grease being coated on the contact surface between the sliding rod and the lubrication ring.

3. The height measuring device according to claim 2, characterized in that, The fixed base includes a base plate and a supporting column; the base plate has a square structure, the side length of the base plate is 200 mm to 300 mm, and the material of the base plate is cast iron; The support column has a cylindrical structure and is vertically fixed at the center of the base plate. The top of the support column is provided with a threaded hole, which is connected to the bottom thread of the measuring body. The outer diameter of the support column is 1.5 to 2 times the outer diameter of the measuring body, and the height of the support column is 50 mm to 80 mm.

4. A height measuring device according to claim 3, characterized in that, The measuring arm includes a horizontal arm and a vertical arm; the horizontal arm has a straight structure, a length of 150 mm to 250 mm, a rectangular cross-section, and is made of aluminum alloy. The vertical arm has a straight structure and is vertically fixedly connected to the horizontal arm to form an L-shaped structure. The length of the vertical arm is 20 mm to 40 mm. The bottom end of the vertical arm is provided with a contact surface, which has a planar structure and a surface roughness of 0.8 μm to 1.6 μm.

5. A height measuring device according to claim 4, characterized in that, The ruler has a strip-shaped structure and is attached longitudinally along the outer wall of the measuring body. The ruler is made of stainless steel and has millimeter graduations and numerical markings.

6. A height measuring device according to claim 5, characterized in that, The indicator block has a ring structure and is arranged around the sliding rod. The inner diameter of the indicator block is in close fit with the outer diameter of the sliding rod. An indicator line is provided on the outer side of the indicator block, which is aligned with the scale line on the ruler. The indicator block and the sliding rod are fixedly connected by a key. The key has a rectangular structure and is made of stainless steel. The key is embedded in the keyway on the outer wall of the sliding rod.

7. A height measuring device according to claim 6, characterized in that, The outer wall of the measuring body is provided with multiple heat dissipation grooves, which are distributed in a spiral structure along the outer wall of the measuring body.

8. A height measuring device according to claim 7, characterized in that, The outer surface of the sliding rod is provided with multiple longitudinal grooves, which have a V-shaped cross-sectional structure.

9. A height measuring device according to claim 8, characterized in that, The upper surface of the horizontal arm of the measuring arm is provided with multiple anti-slip textures, which are in the form of a grid structure.

10. A height measuring device according to claim 9, characterized in that, The depth of the heat dissipation groove is 2 mm to 5 mm, and the multiple heat dissipation grooves are equidistantly spirally distributed on the outer wall of the measuring body.

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