40 results about "Mechanical counter" patented technology

The invention relates to the technical field of pile foundation settlement detection, in particular to pile foundation settlement detection equipment for engineering detection and a detection method.The pile foundation settlement detection equipment comprises a detection equipment body, a mechanical counter is detachably connected to one side of the detection equipment body, and the pile foundation settlement detection equipment further comprises a transmission locking mechanism used for locking during vibration. Through the arrangement of components such as the transmission locking mechanism, the settlement pawl and the vibration pawl are engaged with the ratchet wheel, and the spring is elastically connected with the detection equipment body, when real settlement of the pile foundation occurs, the settlement pawl allows the ratchet wheel to rotate in one direction and drives the mechanical counter to record displacement; and when being interfered by external vibration, the pendulum ball drives the vibration pawl to be clamped into the ratchet wheel to prevent the ratchet wheel from rotating, so that automatic distinguishing and locking of real settlement and vibration displacement are realized, monitoring data jump and false alarm caused by vibration are effectively avoided, and the accuracy and reliability of settlement detection are remarkably improved.

The utility model discloses a flowmeter assembly, and relates to the technical field of metering equipment. The flow meter assembly comprises a metering pipe, fluid pipes are arranged at the two ends of the metering pipe, a motor is fixedly installed on the outer wall of the top of the metering pipe, rotating rods are rotatably installed at the top and the bottom of the metering pipe, eight partition plates are fixedly installed on the outer walls of the rotating rods, the flow meter assembly further comprises a filtering plate fixedly installed on the inner wall of the metering pipe, and a sweeping assembly installed on the outer walls of the rotating rods; and the mechanical counter is fixedly arranged on the outer wall of the bottom of the metering tube. According to the flowmeter assembly, through cooperative use of the motor, the rotating rod, the partition plate and the mechanical counter, the number of turns of rotation of the rotating rod can be calculated, so that the amount of fluid passing through the interior of the metering pipe can be calculated, impurities in the fluid can be filtered through the filter plate, blockage caused by the impurities is avoided, and through the motor, the rotating rod and the cleaning assembly, the cleaning efficiency is improved. Impurities on one side of the filter plate can be cleaned, the filter plate is prevented from being blocked by the impurities, and normal circulation of fluid is guaranteed.

The high-precision flowmeter comprises a rotor, a metering chamber, a mechanical counter and a scraper mechanism, a water inlet and a water outlet are formed in the two ends of the metering chamber respectively, the rotor is rotatably connected into the metering chamber, one end of the rotor penetrates through the side wall of the metering chamber to be connected with the mechanical counter, and the other end of the rotor is connected with the scraper mechanism. One end of each scraper mechanism is connected with the side wall of the rotor, the other end of each scraper mechanism abuts against the inner wall of the metering chamber, and the scraper mechanisms are annularly arrayed around the center line of the rotor at intervals. Due to the adoption of the technical scheme, when the high-precision flow meter is used for metering industrial water, the length of the scraper mechanism can be adjusted, so that the situation that the scraper mechanism is stuck under the influence of temperature difference is reduced to a certain extent, and normal use of the flow meter is ensured to a certain extent.

The utility model relates to the technical field of detection equipment, in particular to construction engineering material safety detection equipment which comprises a body and further comprises a counter which is arranged on the body, is a press type mechanical counter and is used for recording the number of times that a pendulum bob strikes a steel chisel; the extrusion block is arranged on the body; the counting unit is arranged on the body and used for driving the extrusion block to fall down and triggering a counting button on the counter when the pendulum bob ascends, and counting of the steel chisel hit by the pendulum bob is completed. According to the safety detection equipment for the construction engineering materials, workers can accurately record the number of times of the steel chisel hit by the pendulum bob by observing the number on the counter; the working efficiency is greatly improved, and the labor cost is saved; and through the arrangement of the positioning block, the extrusion block is not influenced by shaking caused by wind power, a counting button on the counter can be accurately extruded, the error-tolerant rate of the device is improved, and the detection accuracy is improved.

This utility model relates to an integrated copper-sealed structure for a water meter magnetic steel coupled induction electronic drive counter, comprising: a ring-shaped magnetic steel flow sensing drive structure, disposed in the meter base, for sensing water flow and driving it via magnetic coupling; a magnetic coupling transmission gear set and a counting signal transmission structure, disposed in the meter housing, including the magnetic coupling transmission gear set and an electronic induction circuit board, for transmitting flow data and transmitting signals; and a sealed copper cover and counter support structure, located above the magnetic coupling transmission gear set and the counting signal transmission structure, for sealing and protecting the internal components, forming an integrated copper seal. This utility model seals the matching transmission structure of the magnetically coupled mechanical counter and other metering signals, as well as the magnetic induction signal transmission circuit board for transmitting water meter flow, all within a single copper cover. This sealing structure can improve the manufacturing and assembly performance, metering accuracy and stability, and service life of the smart water meter.

Systems and methods including a servo comprising a gearbox, a servo output, a first encoder, a first encoder input, a second encoder, and a second encoder input. The servo output can be positioned on an output side of the gearbox. The first encoder and the second encoder may be positioned on a board side of the gearbox. The first encoder input and the second encoder input may be configured to communicate with the first encoder and the second encoder respectively. The first encoder input may be mechanically coupled to the gearbox. The second encoder input may be mechanically coupled to the first encoder input. The output side of the gearbox may be opposite the board side of the gearbox.

The present invention provides a counting accessory and a circuit breaker with a counting function, including a mounting shell, and a mechanical counter with a counting shaft for counting, a linkage rod, a swing arm, and a reset torsion spring installed in the mounting shell. One end of the linkage rod extends out of the mounting shell to contact and cooperate with the swinging part of the moving contact of the circuit breaker. One end of the swing arm is fixedly connected to the counting shaft, and the other end is linked to and cooperates with the other end of the linkage rod. The reset torsion spring contacts and cooperates with the linkage rod and / or the swing arm, and is used to drive the linkage rod and / or the swing arm to rotate and reset. The present invention provides a counting accessory with a stable, reliable and independent structure, which is easy to disassemble and install, and can provide technical functions for the circuit breaker without counting function in the prior art through simple installation, thereby improving its use function and meeting actual needs.

The invention relates to the technical field of stamps, and particularly discloses a double-faced overturning type mechanical counting anti-fake stamp which comprises an outer shell, an annular cavity is embedded in the outer shell, first through holes are formed in the front end and the rear end of the outer shell in a penetrating mode, a stamp body is rotationally arranged in the annular cavity, and a sleeve shell is fixedly arranged on the periphery of the outer shell in a sleeving mode; a mechanical counter is embedded in the end face of the number seal, springs are connected between the character seal and the cylinder sleeve and between the number seal and the cylinder sleeve, rotating shafts rotationally connected with the sleeve shell are arranged on the two sides of the partition plate, and strip-shaped guide rails are arranged on the two side edges of the cylinder sleeve. First handle protrusions are fixedly arranged on the two sides of the character seal, second handle protrusions are fixedly connected to the two sides of the number seal, an output hole is formed in the lower end of the outer shell, and a rotating assembly is arranged on the sleeve shell. According to the invention, the character seal and the digital seal come from the same seal at the same angle after being turned over, so that accurate tracing can be realized.

Systems and methods including a servo comprising a gearbox, a servo output, a first encoder, a first encoder input, a second encoder, and a second encoder input. The servo output can be positioned on an output side of the gearbox. The first encoder and the second encoder may be positioned on a board side of the gearbox. The first encoder input and the second encoder input may be configured to communicate with the first encoder and the second encoder respectively. The first encoder input may be mechanically coupled to the gearbox. The second encoder input may be mechanically coupled to the first encoder input. The output side of the gearbox may be opposite the board side of the gearbox.

This utility model provides a valve control system with a monitoring and counting function, comprising at least: a solenoid valve, a pneumatic shut-off valve, and a solenoid valve switching feedback device; the pneumatic shut-off valve comprises at least a first cylinder and a first piston rod; the solenoid valve switching feedback device comprises at least a second cylinder, a second piston rod, and a mechanical counter mounted on the outer side of the second cylinder; the solenoid valve comprises at least an inlet, a first outlet, and a second outlet, the first outlet being connected to the first cylinder's working chamber and the second cylinder's working chamber respectively, and the second outlet being connected to the first cylinder's return chamber and the second cylinder's return chamber respectively; the solenoid valve is controlled to open the first outlet and close the second outlet, the first cylinder's working chamber being filled with air to drive the first piston rod to extend, thereby opening the pneumatic shut-off valve; the second cylinder's working chamber being filled with air to drive the second piston rod to extend and press the counting contact of the mechanical counter to count, thereby recording the number of times the pneumatic shut-off valve has opened.

The invention provides an expansion joint accumulated displacement measuring device, and relates to the field of expansion joint measurement. A transmission chain; a containing groove is formed in the side face of the moving chain wheel in an inwards-sunken mode, and driving teeth are arranged on the groove side wall of the containing groove in the circumferential direction. The rotating wheel is arranged in the containing groove and coaxial with the moving chain wheel, the rotating wheel comprises a wheel body, a swing shifting block and a columnar protrusion, and the swing shifting block is connected to the wheel body through a pivotal shaft parallel to the axial direction of the wheel body and can swing towards the axis of the wheel body; a coaxial columnar protrusion extending outwards is arranged on the side face, away from the containing groove, of the wheel body, and transmission wheel teeth are arranged on the circumferential face of the protrusion. The connecting shaft transversely penetrates through the bulge, the wheel body and the moving chain wheel in sequence; the mechanical counter is fixedly arranged on the connecting shaft and is used for recording the accumulated number of turns of rotation of the moving chain wheel in the set direction; and a fixing rod. According to the measuring device provided by the invention, the accumulated displacement data of the expansion joint can be measured through a pure mechanical structure, the structure is simple, and the cost is low.

This utility model relates to the field of highway engineering technology and discloses a road surface quality testing device, including a trolley with two front wheels and two rear wheels symmetrically arranged at the bottom of the trolley. A water tank, a control and storage module, and a connecting rod are fixedly installed on the top surface of the trolley. A measuring cylinder is slidably fitted on the trolley. An intermittent testing component is movably mounted on one of the rear wheels and includes a semi-circular gear, a gear, a cam, a connecting rod, and a testing module. A sweeping component is movably mounted at the bottom of the trolley and includes a sweeping brush, a rotating shaft, a scraper, a guide rod, a swing shaft, and a cylinder seat. The device uses a laser rangefinder in the testing module to scan the road surface contour in real time, generating a smoothness curve. A mechanical probe identifies cracks, and a mechanical counter records the number of rear wheel rotations to detect mileage. The measuring cylinder and water tank detect the permeability of the road surface. Multiple indicators are detected simultaneously without the need for multiple operations, improving the ease of use of the device.

The utility model discloses a switch operating mechanism for a low-voltage drawer cabinet, which comprises a drawer body, an installation cavity is arranged in the drawer body, a molded case circuit breaker is installed in the installation cavity, and the front end face of the drawer body is rotatably connected with a knob switch. The knob switch and the molded case circuit breaker are connected through a switch operation mechanism, a counter is fixedly installed on the side, located on the molded case circuit breaker, in the installation cavity, and the counter is connected with the switch operation mechanism through a pull wire. In combination with the structural design of the utility model, by rotating the knob switch, when the molded case circuit breaker is switched on, the square shaft rotates, the first connecting sheet on the square shaft drives the stay wire, the stay wire drives the second connecting sheet installed on the mechanical counter, and counting is increased by one every time the molded case circuit breaker is switched on, thereby effectively solving the problems proposed in the background technology.

1. Name of the product in this design: Jump rope handle (gradient mechanical counter). 2. Purpose of this design: Handles at both ends of a jump rope. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the key design points: Design 1 3D view. 5. Design 1 is designated as the basic design.

There is provided a conveyor device 1 configured to move an article between a first point and a second point. The conveyor device 1 comprises a conveying means 20 spanning a distance between the first point and the second point. The conveying means 20 is configured to move the article in a first direction. The device further comprises a diverting means 12 adjacent to the conveying means 20. The diverting means 12 is configured to move the article in a second direction. The second direction is at an angle relative to the first direction. The device may be configured to be in an airport or a transport hub and the item may be baggage. The device may include a protrusion 22 and a probe 40 which may be a mechanical counter which physically interacts with the protrusion. Also claimed is a computer implemented method for driving the conveyor described above.

In a stop module with a stop element (21) movably mounted on a base body (24) for moving objects (16), wherein the stop element (21) can be moved downwards out of a transport plane (13) and upwards back into it by means of an actuating device having an actuator (29), and with a damping device (48) for damping the impact of an object (16), such that the stop element (21) can be moved in a damped manner from a stop element starting position (22) towards a stop element end position (49) that prevents further movement of the stop element (21) upon impact, the actuating device has a mechanical control element (50) which is coupled to a mechanical counter-control element (51) such that upon impact the actuator (29) can be activated via activation means and the mechanical control element (50) is caused to execute a control movement.which allows the stop element to be moved from the stop element starting position (22) to the stop element end position (49).

The invention discloses an intelligent lightning stroke counter for disaster prevention, and relates to the technical field of lightning stroke counting, the intelligent lightning stroke counter comprises a cabinet body, a lightning current collector, an electromagnet and an electronic counter are arranged in the cabinet body, the lightning current collector is connected with the electromagnet, the electronic counter is provided with a second contact, and the second contact is connected with the electromagnet. A mechanical counter is arranged on the inner wall of one side of the cabinet body, a driving assembly matched with the electromagnet is arranged on the inner wall of the other side of the cabinet body, the driving assembly is attracted and moved through the electromagnet during lightning stroke, and the mechanical counter and the electronic counter are triggered through the driving assembly to conduct mechanical counting and electronic counting on the lightning stroke. The outer wall of the cabinet body is provided with a lightning guiding assembly connected with the lightning current collector. According to the invention, lightning strokes can be accurately counted, lightning waveforms can be recorded in real time, drawing paper can be automatically supplied and processed, and the requirements of disaster prevention on real and effective lightning stroke data can be met.

The invention relates to the technical field of counters, in particular to a mechanical counter of a remote transmission ammeter, which comprises a counter shell and a character wheel group rotatably assembled in the counter shell, the character wheel group is composed of a plurality of coaxially arranged character wheels, ten groups of white scale marks are uniformly preset on the circumferential surface of each character wheel along the circumferential direction in a surrounding manner, and the number of the white scale marks is 10. White scale marks are arranged on the counter shell, infrared reflection coatings are adopted for the white scale marks, infrared absorption coatings are adopted for the rest areas of the unit-bit character wheels and the whole areas of the rest character wheels, an infrared sensing module is fixedly assembled in the counter shell corresponding to the installation positions of the unit-bit character wheels, and a verification remote transmission unit is fixed on the inner side of the counter shell. The infrared sensing module is composed of an active infrared sensor, an infrared driving module, a signal amplification module and a shaping module. The invention aims to solve the problems that a traditional mechanical counter needs manual regular meter reading, a large amount of manpower cost is consumed, meter reading errors exist, and meter reading is missed.

The utility model relates to an ultrasonic water meter with a mechanical counter, which comprises a measuring pipeline and a meter head arranged on the measuring pipeline, the meter head comprises a meter shell, an electromagnetic counter and a signal processor, the electromagnetic counter and the signal processor are arranged in the meter shell, and an ultrasonic transducer is in circuit connection with the input end of the signal processor. The output end of the signal processor is in circuit connection with the electromagnetic counter; the meter shell comprises a lower shell body and a meter cover, a waterproof partition plate is installed in the meter cover, and an inner cavity of the meter cover is separated from an inner cavity of the lower shell body through the waterproof partition plate. According to the utility model, the independent electromagnetic counter is integrated in the electronic metering system of the ultrasonic water meter, and flow data are synchronously recorded to the electromagnetic counter when the electronic system works normally; when an electronic system has a fault, the electromagnetic counter can still independently provide accumulated flow data before the fault, and the risk of single storage failure is avoided, so that the problem of data island of a pure electronic water meter is solved, and double guarantees are provided for water affair management.

The utility model provides a mechanical counter for an electronic type water meter, which comprises a shell, a transparent plate is arranged at the top of the shell, an upper clamping plate and a lower clamping plate are respectively arranged in the shell, a mechanical counting device is arranged between the upper clamping plate and the lower clamping plate, a stepping motor is arranged on the lower clamping plate, and the stepping motor is connected with the transparent plate. A stepping motor is installed in the lower clamping plate, the stepping motor is connected with a mechanical counting device, a circuit board is installed between the lower clamping plate and the shell, the stepping motor is electrically connected with the circuit board, the circuit board is electrically connected with a power source, and the circuit board is in signal connection with an electronic water meter. When the electronic water meter is continuously used due to unforeseen circumstances and exceeding the service life, the water volume data of the electronic water meter before power failure is kept in the character wheel and the pointer which are mechanically displayed, and the display mode of the mechanical character wheel and the pointer is accepted by vast water users, so that water fee disputes are avoided.

The invention discloses a temperature measuring device for a deep geothermal well, and belongs to the technical field of temperature measurement. Comprising a piston plate, a piston rod, a rocker, a driving pawl, a gear and a counter, the piston plate is connected into the box body in a sealed and sliding mode and divides the box body into an upper cavity and a lower cavity. The lower cavity is filled with inert gas; the top of the piston plate is connected with a piston rod; the long rod part of the rocker is connected with the piston rod through a hook spring; the top end of the end of the rocker is hinged to the driving pawl. The center of the gear is rotationally connected with the box body, and the driving pawl is meshed with the gear; a mechanical counter is directly integrated on a gear, each gear tooth of the gear corresponds to a certain temperature variation, and temperature measurement is achieved by metering the number of revolutions of the gear; the device is suitable for long-term temperature monitoring work in high-temperature severe environments such as geothermal wells and the like, and can effectively prevent measurement errors caused by environmental factors.

Systems and methods including a servo comprising a gearbox, a servo output, a first encoder, a first encoder input, a second encoder, and a second encoder input. The servo output can be positioned on an output side of the gearbox. The first encoder and the second encoder may be positioned on a board side of the gearbox. The first encoder input and the second encoder input may be configured to communicate with the first encoder and the second encoder respectively. The first encoder input may be mechanically coupled to the gearbox. The second encoder input may be mechanically coupled to the first encoder input. The output side of the gearbox may be opposite the board side of the gearbox.

The application relates to a high-precision flowmeter which comprises a rotor, a metering chamber, a mechanical counter and a scraper mechanism, the metering chamber is provided with a water inlet and a water outlet at two ends respectively, the rotor is rotatably connected in the metering chamber, one end of the rotor penetrates through the side wall of the metering chamber and is connected with the mechanical counter, one end of the scraper mechanism is connected with the side wall of the rotor and the other end abuts against the inner wall of the metering chamber, the scraper mechanism is multiple, and the multiple scraper mechanisms are arranged in a ring-shaped interval array around the center line of the rotor. When the high-precision flowmeter is used to measure industrial water, the length of the scraper mechanism can be adjusted, so that the situation that the scraper mechanism is stuck due to the temperature difference is reduced to a certain extent, and the normal use of the flowmeter is ensured to a certain extent.

The utility model relates to a hydraulic and mechanical combined adjusting device for temporary beam falling of a support, which comprises an upper cover plate and a base, a hydraulic jacking device and a mechanical counter-force device are arranged between the upper cover plate and the base, the hydraulic jacking device comprises a jack, one side of the jack is supported on the base, the other side of the jack is contacted with the upper cover plate, and the mechanical counter-force device is connected with the hydraulic jacking device. The mechanical counter-force device comprises a counter-force screw column, one side of the counter-force screw column is in threaded fit with the upper cover plate, the length of the counter-force screw column extending out of the upper cover plate can be adjusted by screwing in and out, and the other side of the counter-force screw column makes contact with the base. The device has the advantages of safely and effectively solving the problem of controlling the bearing reaction of beam falling work, ensuring the relative displacement of upper and lower structures before and after beam falling, ensuring the accurate matching of support mounting bolt holes, and ensuring the reasonable and controllable stress of the structure in the system conversion process before and after beam falling; cost is low, support counterforce and relative displacement of upper and lower structures are reasonable and controllable, structural boundary conditions during temporary beam falling are reasonable, and the device can be recycled.

1. The name of the design product: rope skipping handle (special-shaped mechanical counting). 2. The use of the design product: handle for both ends of the rope skipping. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The utility model discloses an integrated flowmeter protective cover convenient to install, which belongs to the technical field of flowmeters and comprises a protective cover main body, two groups of arc-shaped grooves are arranged on two sides of the protective cover main body, and installation components are arranged at corresponding positions below the arc-shaped grooves and located at the bottom of the protective cover main body. A mechanical counter cover is arranged at the top of the protective cover body, a glass observation window is arranged at the top of the mechanical counter cover, and a fixing assembly is arranged at the bottom of the glass observation window and located between the inner walls of the mechanical counter cover. The protective cover body, the arc-shaped groove, the installation assembly and the mechanical counter cover are used in cooperation, the flowmeter can be protected, splicing is reduced, the sealing performance and the overall strength are improved, assembling is easy and fast, the protective cover body can be conveniently installed or disassembled, the flowmeter can be conveniently overhauled, and the applicability of the device is improved.

The utility model discloses a hand-pull valve with a handle counting function, which relates to the technical field of hand-pull valves and comprises a hand-pull valve main body, an operating pull rod is arranged on one side of the hand-pull valve main body, a counting lubricating box is fixedly connected to the front surface of the hand-pull valve main body, a pull rod clamping seat is sleeved on the operating pull rod, and a handle is arranged on the handle clamping seat. A pull rod rack is fixedly connected to the side, facing the counting lubricating box, of the pull rod clamping seat, the pull rod rack is movably inserted into an inner cavity of the counting lubricating box, and a driving input gear is rotationally installed in the position, corresponding to the upper side of the pull rod rack, of the inner cavity of the counting lubricating box. Through the arrangement of the mechanical counter, a maintainer can judge the pulling times of the operation pull rod by directly observing the reading of the mechanical counter, so that a judgment basis is provided for maintenance of the hand-pull valve body, timely maintenance of the hand-pull valve body is guaranteed, meanwhile, lubricating operation is simpler, more convenient and faster, independent lubricating operation is not needed, and the working efficiency is improved.

The utility model discloses a kind of rotary angle detection devices of bucket wheel machine, comprising: angle detection mechanism, between rotary mechanism and cab is installed, for realizing machine simple mechanical counter, wherein, angle detection mechanism includes disc chassis and the support located just below disc chassis, with linkage shaft fixed in disc chassis inside.The utility model mobile assembly will be when rotary mechanism rotates to specific angle, the arc wedge platform of disc chassis top contacts the support arm of specific position and lifts, synchronous belt drive support arm top's indicating platform and the digital identification bin of corresponding angle of indicating platform top, so that operating personnel can observe the position indicated by indicating platform, approximately determine the current rotary angle of bucket wheel machine, and then even if main angle sensor fails or deviation, the mechanical angle indicating mechanism can still provide intuitive, approximate position reference, ensure that coal stacking or coal extraction operation can continue, improve the overall operation reliability of equipment.

The utility model discloses a spot welding machine welding spot counting device which comprises a spot welding mechanism and a PLC (programmable logic controller), a mechanical counter linked with the spot welding mechanism is arranged on one side of the spot welding mechanism, the spot welding mechanism comprises an upper electrode and a lower electrode which correspond to each other up and down, and the mechanical counter comprises a reciprocating rod sleeved with a spring and abutted against an upper connecting plate and a swing part linked with the reciprocating rod. The swinging part is in transmission connection with a pawl and is also connected with a counting wheel and an impeller through a transmission shaft; mechanical counting is achieved through PLC welding spot counting and ingenious displacement action combination during electric welding, double counting is provided for the spot welding machine, the combined action mode is reasonable, mechanical counting is carried out once in each electric welding, welding spot counting is more direct, the anti-interference capacity of the mechanical technology is higher, the anti-interference capacity of pure mechanical counting is higher, and the working efficiency of the spot welding machine is improved. The problem that counting of a PLC is prone to being interfered is solved, rechecking and checking of operators are facilitated, the number of welding spots is accurately counted in production, and missing welding / repeated welding is prevented.

The utility model discloses a mining underground explosion-proof portable distance measuring device, which relates to the technical field of mining distance measuring devices, and comprises a box body, a mechanical counter arranged in the box body, and two rollers which are respectively and rotatably arranged on two sides of the box body and synchronously rotate with a driving shaft of the mechanical counter, and a connecting plate is detachably arranged at the rear end of the box body. The rear end of the connecting plate is bent upwards, and a push rod is detachably installed at the rear end of the connecting plate. The distance measuring device can meet the requirement for measuring the distance of the irregular shape of a mine, is suitable for measuring the length of the irregular shape such as a circle, a semicircle and a triangle underground, can be used for measuring places which cannot be directly measured by a meter ruler, saves the measuring time, and improves the labor efficiency of operators. The number of the rollers is two, and the walking stability of the distance measuring device can be improved. And by arranging the connecting plate, the box body and the push rod can be conveniently connected, and the push rod can be conveniently replaced.