Tension meter

Abstract

The invention relates to the technical field of force measuring devices, in particular to a tensiometer. The tensiometer comprises a machine shell and a meter head installed on the machine shell, the machine shell is provided with a fixed pressing body and a movable pressing body which are used for being matched with a tested tensioned object, a transmission structure is arranged between the movable pressing body and the meter head so as to transmit force to the meter head when the movable pressing body moves, and the transmission structure comprises a transmission shaft extending in the moving direction of the movable pressing body. The transmission shaft comprises a transmission main body and an adjusting shaft, the movable pressing body is fixed with the adjusting shaft, the transmission main body is provided with a force transmission part for transmitting force to the meter head, and the adjusting shaft is adjustably connected to the transmission main body in the moving direction of the movable pressing body so as to change the position of the movable pressing body relative to the fixed pressing body by changing the position of the adjusting shaft. The same tensiometer can be applied to measurement of tensioned objects with different diameters or thicknesses, and the measurement cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of force measuring devices, and in particular to a tension meter. Background Art

[0002] Mechanical tension meters can be used to measure the tension of transmission belts or tensioning objects such as wires and ropes. The basic structure of the commonly used tension meters can be found in the Chinese utility model patent with the authorization announcement number CN211954525U, which discloses a digital tension meter for measuring the force value of aviation steel cables. The tension meter includes a body, a control device is installed on the front of the body, a support plate is fixedly installed on the front of the body, a fixed plate is fixedly installed on the support plate, a static roller is installed on the fixed plate through a pin, a probe extends from the middle of the body, a dynamic roller is installed on the head of the probe, a lever is installed on one side of the body, a handle is fixedly installed under the body, and a handle is fixedly installed at the rear of the body. When in use, turn on the control device, retract the probe by rotating the lever, place the steel cable between the static roller and the dynamic roller, rotate the lever in the opposite direction to make the lever in a vertical state, and then start data reading. Among them, the machine body, support plate and fixed plate together constitute the casing of the tension meter, the control device constitutes the head of the tension meter for displaying the tension value, the static roller constitutes the fixed pressing body, and the dynamic roller constitutes the dynamic pressing body. The dynamic roller can move relative to the static roller and transmit force to the head through the probe transmission connection. The displacement of the dynamic roller can drive the displacement of the test axis of the head, thereby realizing the measurement of the tension force.

[0003] When measuring a tensioner, the tensioner enters between a fixed pressure body and a dynamic pressure body, and the tension is measured by winding around a triangular force measuring structure formed by two fixed pressure bodies and one dynamic pressure body. Under the tension of the tensioner, the dynamic pressure body moves relative to the fixed pressure body to measure the tension. Since the tensioner itself has a certain diameter or thickness, the dynamic pressure body will be displaced a certain distance due to the diameter or thickness of the tensioner itself, resulting in measurement deviation. In order to avoid the measurement deviation, the dynamic pressure body is offset relative to the fixed pressure body in advance to offset the influence of the size of the tensioner being measured on the displacement of the dynamic pressure body, so that the displacement of the dynamic pressure body is only affected by the tension of the tensioner being measured. Different tensioners being measured have different thicknesses or diameters. In order to adapt to the tension measurement of different tensioners being measured, different tension meters need to be used. One tension meter has a set relative position between the dynamic pressure body and the fixed pressure body, which has a high measurement cost and is inconvenient to use. Summary of the invention

[0004] The object of the present invention is to provide a tension meter to solve the problem that the current tension meter cannot adapt to tension objects of different diameters or thicknesses, so that different tension objects to be measured need to be equipped with different tension meters, resulting in high measurement costs.

[0005] The technical solution of the tensiometer of the present invention is: A tension meter comprises a casing and a gauge head mounted on the casing, the casing is provided with a fixed pressure body and a dynamic pressure body for cooperating with a tensioned object to be measured, a transmission structure is provided between the dynamic pressure body and the gauge head for transmitting force to the gauge head when the dynamic pressure body moves, the transmission structure comprises a transmission shaft extending along the moving direction of the dynamic pressure body, the transmission shaft comprises a transmission body and an adjusting shaft, the dynamic pressure body is fixed to the adjusting shaft, the transmission body is provided with a force transmission part for transmitting force to the gauge head when the transmission shaft moves, the tension meter comprises an elastic member for maintaining the position of the transmission body relative to the casing when not subjected to external force, the adjusting shaft is adjustably connected to the transmission body in the moving direction of the dynamic pressure body so as to change the position of the dynamic pressure body relative to the fixed pressure body by changing the position of the adjusting shaft relative to the transmission body.

[0006] Beneficial effects: The present invention is an improvement on the tension meter in the prior art. A transmission shaft with adjustable length is arranged between the dynamic pressure body and the meter head. The dynamic pressure body is fixed to the adjusting shaft of the transmission shaft. The transmission body of the transmission shaft transmits force to the meter head. When the dynamic pressure body moves due to the tension of the measured tensioning object, the tension can be measured by transmitting force to the meter head through the adjusting shaft and the transmission body. When facing tensioning objects of different thicknesses or diameters, the position of the adjusting shaft of the transmission shaft relative to the transmission body is changed in the moving direction of the dynamic pressure body to adjust the length of the transmission shaft. When the tension meter is not subjected to external force, the position of the transmission body relative to the casing is maintained by the elastic member, thereby changing the position of the dynamic pressure body relative to the fixed pressure body when the tension meter is not subjected to external force. According to the thickness or diameter of the different tensioning objects to be measured, the position of the dynamic pressure body is adjusted to adapt to the measurement of different tensioning objects, thereby reducing the measurement cost.

[0007] Furthermore, the adjusting shaft is threadedly connected to the transmission body, and a guide structure for guiding the dynamic pressing body to move is provided on the casing. The adjusting shaft is driven to move axially by rotating the transmission body to change the position of the adjusting shaft relative to the transmission body.

[0008] Furthermore, an axial scale is provided on the adjusting shaft.

[0009] Furthermore, a circle of circumferential scales cooperating with the axial scales is provided on the transmission body, and the axial displacement of the adjustment shaft generated when the transmission body rotates one circle is a graduation value of one axial scale.

[0010] Furthermore, a differential head is provided at one end of the transmission body, the circumferential scale is arranged on the differential head, the adjusting shaft passes through the differential head, the adjusting shaft is threadedly connected to the main shaft, the measuring shaft of the meter head is fixed with a pressure plate, and the differential head is provided with a pressing end surface for pressing the pressure plate when the dynamic pressing body moves relative to the fixed pressing body, and the pressing end surface constitutes the force transmission part.

[0011] Furthermore, a knob is coaxially connected to one end of the transmission body away from the adjustment shaft, and a clearance space is provided on the casing for exposing the knob.

[0012] Furthermore, a baffle is provided on the transmission body, and a limit seat is provided on the casing on a side of the baffle away from the dynamic pressure tightening body. The limit seat is provided with a through hole for the transmission body to pass through. A portion of the transmission body located between the baffle and the limit seat is provided with a reset spring, and both ends of the reset spring are respectively used to abut the baffle and the limit seat. The reset spring constitutes the elastic member. The portion of the transmission body passing through the limit seat is threadedly connected with an adjusting nut. When the tension meter is not subjected to external force, the adjusting nut is acted upon by the reset spring and forms a stop fit with the limit seat so as to change the contact pressure between the reset spring and the baffle and the limit seat by screwing the adjusting nut.

[0013] Furthermore, a contact surface is provided on the transmission body, and a fine-tuning abutment seat is provided on the casing in an axial direction of the transmission shaft so as to be adjustably positioned. The fine-tuning abutment seat is located on the side of the abutment surface away from the dynamic pressure body. A fine-tuning spring is mounted on the transmission body, and one end of the fine-tuning spring abuts against the abutment surface and the other end abuts against the fine-tuning abutment seat so as to change the pre-compression amount of the fine-tuning spring by adjusting the position of the fine-tuning abutment seat.

[0014] Furthermore, the dynamic pressing body and the fixed pressing body both include a first pressing part and a second pressing part which are coaxially arranged. The first pressing part is a cylinder and the outer circumferential surface of the cylinder is used to press against the side surface of the measured tensioner in the thickness direction when measuring a belt-shaped tensioner. The outer circumferential surface of the second pressing part is provided with an annular groove and the inner wall of the annular groove is an arc surface for adapting to press against the outer circumferential surface of the measured tensioner when measuring a rope-shaped tensioner.

[0015] Furthermore, a wrench is rotatably connected to the casing, and the wrench is connected to a force transmission structure for transmitting force to the transmission body. A reset spring is provided between the casing and the transmission body, and the reset spring constitutes the elastic member. The wrench has an avoidance position in its rotation stroke for driving the transmission body to move the dynamic clamping body away from the fixed clamping body to avoid the measured tensioning object, and an initial position reset by the reset spring when not subject to external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a tensiometer from a front side perspective according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the tensiometer from the rear side; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the tensiometer in FIG. Figure 4 for Figure 1 Schematic diagram of the matching structure of the transmission shaft of the tension meter and the wrench; Figure 5 for Figure 1 A schematic diagram of the matching position of the adjustment axis of the tensiometer and the scale of the main axis; Figure 6 for Figure 1 Schematic diagram of the tension meter used for measuring the tension of the transmission belt; Figure 7 for Figure 1 Schematic diagram of the tensiometer used for rope tension measurement.

[0017] In the figure: 100, transmission belt; 200, rope; 10. Housing; 11. Main fixing plate; 12. Handle; 13. Upper guide seat; 14. Lower guide seat; 15. Fine-tuning abutment seat; 20. Header; 21. Measuring shaft; 30. Dynamic clamping body; 31. Fixed clamping body; 32. Clamping column; 33. Clamping wheel; 41. Adjusting shaft; 42. Main shaft; 43. Differential head; 44. Connecting shaft; 45. Knob; 46. Fine-tuning spring; 47. Main spring; 48. Adjusting nut; 49. Stop; 50. Pressure plate; 60. Wrench; 61. Connecting rod; 62. Crank arm; 70. Shrapnel clip. DETAILED DESCRIPTION

[0018] A transmission shaft with adjustable length is arranged between the dynamic pressure body and the meter head of the tension meter of the present invention. The position of the dynamic pressure body relative to the fixed pressure body is changed by adjusting the length of the transmission shaft. The position of the dynamic pressure body is adjusted according to the thickness or diameter of the tensioned object to be measured. In this way, the same tension meter can be used to measure different tensioned objects, thereby reducing the measurement cost.

[0019] Embodiments of the tensiometer of the present invention: The tension meter includes a casing and a gauge head installed on the casing. The casing is provided with a fixed pressure body and a dynamic pressure body for cooperating with the tensioned object to be measured. A transmission structure is provided between the dynamic pressure body and the gauge head to transmit force to the gauge head when the dynamic pressure body moves. The transmission structure includes a transmission shaft extending along the moving direction of the dynamic pressure body. The transmission shaft includes a transmission body and an adjusting shaft. The dynamic pressure body is fixed to the adjusting shaft. The transmission body is provided with a force transmission part for transmitting force to the gauge head when the transmission shaft moves. The adjusting shaft of the transmission shaft is adjustably connected to the transmission body in the moving direction of the dynamic pressure body so as to change the position of the dynamic pressure body relative to the fixed pressure body by changing the position of the adjusting shaft. When the dynamic tensioning body moves due to the tension of the measured tensioning object, the force can be transmitted to the meter head through the adjusting shaft and the transmission body to measure the tensioning force. When facing tensioning objects of different thicknesses or diameters, the position of the adjusting shaft of the transmission shaft relative to the transmission body is changed in the moving direction of the dynamic tensioning body, and the length of the transmission shaft is adjusted, thereby changing the position of the dynamic tensioning body relative to the fixed tensioning body. The position of the dynamic tensioning body can be adjusted according to the thickness or diameter of the tensioning object being measured. In this way, the same tension meter can be used to adapt to the measurement of different tensioning objects, thereby reducing the measurement cost.

[0020] Specifically, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the tension meter includes a housing, a meter head 20, a fixed pressure body 31, and a dynamic pressure body 30. The housing includes an outer shell 10 and a main fixing plate 11, the outer shell 10 has an inner cavity, the main fixing plate 11 has a main body fixed in the outer shell 10 and an upper end located outside the outer shell 10, and the fixed pressure body 31 is fixed to the upper end of the main fixing plate 11. The meter head 20 is arranged forward, and the meter head 20 is fixed on the main body of the main fixing plate 11 and protrudes forward from the outer shell 10. The fixed pressure body 31 and the dynamic pressure body 30 are used to cooperate with the tension object to be measured to measure the tension. A transmission structure is provided between the dynamic pressure body 30 and the gauge head 20 to transmit force to the gauge head 20 when the dynamic pressure body 30 is pressed and moved under the action of the tensioning force of the measured tensioning object. The two fixed pressure bodies 31 are arranged side by side on the left and right, and the dynamic pressure body 30 moves relative to the casing in the up and down directions. The transmission structure includes a transmission shaft extending along the moving direction of the dynamic pressure body 30, and the transmission shaft includes a transmission body and an adjusting shaft. The transmission body includes a differential head 43, a main shaft 42, and a connecting shaft 44 arranged in sequence from top to bottom. The adjusting shaft 41 is connected to the upper end of the transmission body, and the dynamic pressure body 30 is fixed to the upper end of the adjusting shaft 41. The differential head 43 of the transmission body is provided with a force transmission part for transmitting force to the gauge head 20, and the adjusting shaft 41 of the transmission shaft is connected to the main shaft 42 of the transmission body in a positionally adjustable manner in the moving direction of the dynamic pressure body 30.

[0021] When the dynamic pressure body 30 is moved downward by the tension of the measured tension object, the transmission shaft moves accordingly, and the force can be transmitted to the meter head 20 through the adjustment shaft 41 and the differential head 43 of the transmission body to measure the tension. When the tension meter is not subjected to external force, the elastic member is used to fix the position of the transmission body relative to the housing. During measurement, the measured tension object presses the dynamic pressure body and the transmission shaft downward and overcomes the elastic force of the elastic member to apply force to the meter head. When facing tension objects of different thicknesses or diameters, before measurement, by changing the position of the adjustment shaft 41 of the transmission shaft relative to the transmission body, adjusting the length of the transmission shaft, and changing the upper and lower positions of the upper end of the adjustment shaft 41 relative to the housing in the natural state, the position of the dynamic pressure body 30 relative to the fixed pressure body 31 is changed. According to the thickness or diameter of the different tension objects to be measured, the position of the dynamic pressure body 30 is adjusted to adapt to avoid the influence of the thickness or diameter of the measured tension object itself on the tension measurement. In this way, the same tension meter can be used to adapt to the tension measurement of tension objects of different thicknesses or diameters, reducing the measurement cost and facilitating the measurement operation.

[0022] The housing 10 includes two separate front and rear housings. The front housing and the rear housing are connected to form an inner cavity of the housing 10. The upper part of the housing 10 is thicker and the lower part is thinner. The meter head 20 is installed on the upper part of the housing 10, and the transmission shaft is arranged on the rear side of the main fixed plate 11 facing away from the meter head 20. A handle 12 is formed at the lower part of the housing 10 for easy handholding. The main body of the main fixed plate 11 extends in the up-down direction. The upper end of the main fixed plate 11 is provided with two left-right symmetrical ears. The left and right fixed clamping bodies 31 are fixedly mounted on the ears on both sides respectively. The dynamic clamping body 30 is located above the housing 10. The dynamic clamping body 30 is located between the fixed clamping bodies 31 on both sides in the left-right direction and has the same spacing as the fixed clamping bodies 31 on both sides.

[0023] The adjusting shaft 41 is threadedly connected with the main shaft 42 of the transmission body. The casing is provided with a guide structure for guiding the dynamic pressure body 30 to move. The position of the adjusting shaft 41 can be changed by rotating the transmission body. A threaded hole is provided on the upper part of the main shaft 42, and an external thread is provided on the lower part of the adjusting shaft 41 to cooperate with the threaded hole on the upper part of the main shaft 42 to form a threaded connection. A guide hole is provided on the upper end of the main fixed plate 11 to pass through the front and back. The guide hole is a long hole extending in the up and down direction. The dynamic pressure body 30 is penetrated in the guide hole and forms a guide match. The guide hole can meet the up and down movement of the dynamic pressure body 30 and guide and limit the dynamic pressure body 30. A limiting structure for limiting the transmission body is provided in the housing 10 to limit the upward movement of the transmission body. Since the dynamic pressure body 30 is guided to move, and the upper end of the adjusting shaft 41 is fixedly connected to the dynamic pressure body 30, the adjusting shaft 41 can be driven to move up and down by screwing the transmission body, and the adjusting shaft 41 will not rotate. The position adjustment of the adjusting shaft 41 is realized by using a threaded connection structure, which has a simple structure and is easy to adjust. In other embodiments, a socket can be set on the upper part of the main shaft, and the lower part of the adjusting shaft is inserted into the socket, and a plurality of adjusting pin holes are provided on the hole wall of the socket, and a positioning pin hole is provided on the lower part of the adjusting shaft. The positioning pin hole and the adjusting pin hole are used to penetrate the positioning pin to limit the axial position of the adjusting shaft relative to the main shaft. The position adjustment of the adjusting shaft relative to the main shaft can be achieved by coordinating the positioning pin hole with different adjusting pin holes. In order to facilitate the installation of the positioning pin, an avoidance long hole can be provided on the outer shell.

[0024] The adjusting shaft 41 is provided with an axial scale. The axial scale on the part of the adjusting shaft 41 extending outside the transmission body is used to facilitate the determination of the position of the adjusting shaft 41 relative to the transmission body, and then to facilitate the determination of the adjustment amount. The transmission body is provided with a circle of circumferential scales that match the axial scales. The upper end of the main shaft 42 of the transmission body is provided with a differential head 43, and the circumferential scale is set on the differential head 43. When the differential head 43 rotates one circle, the axial displacement of the adjusting shaft 41 is the graduation value of one axial scale. The axial scale and the circumferential scale cooperate to form a structure consistent with the principle of a screw micrometer, so as to more accurately determine the displacement adjustment amount of the adjusting shaft 41 relative to the transmission body. When the scale value is 0, the dynamic pressure body 30 is pressed upward against the hole wall of the guide hole at the upper end of the main fixed plate 11. The dynamic pressure body 30 and the upper side hole wall of the guide hole can have a small gap or can be in contact but without contact pressure. The dynamic pressure body 30 is flush with the two fixed pressure bodies 31. In other embodiments, the displacement adjustment amount of the adjustment shaft relative to the transmission body can be determined by measuring the distance between the dynamic pressure body and the housing with a caliper without setting a scale. In other embodiments, the displacement adjustment amount of the adjustment shaft relative to the transmission body can be determined by only using the axial scale without setting a circumferential scale as needed.

[0025] The differential head 43 is sleeved on the upper end of the main shaft 42 and fixed, and the adjustment shaft 41 passes through the center hole of the differential head 43 to be threadedly connected to the main shaft 42. The housing 10 is provided with an avoidance hole for avoiding the transmission shaft, and the differential head 43 can be exposed from the upper part of the housing 10. The differential head 43 is a conical structure, and the circumferential scale is set on the conical surface. A pressure plate 50 is fixed on the upper end of the measuring shaft 21 of the gauge head 20. The pressure plate 50 is arranged horizontally. One end of the pressure plate 50 is fixed to the measuring shaft 21 of the gauge head 20, and the other end passes through the main fixed plate 11 and extends to the bottom of the differential head 43. The lower end face of the differential head 43 constitutes a top pressure end face, and the top pressure end face constitutes a force transmission part. During measurement, the measured tensioning object pushes the clamping body 30 to move downward, and the dynamic clamping body 30 moves downward to drive the transmission shaft to move downward. The differential head 43 moves downward and pushes the pressure plate 50 downward through the top push end face. The transmission shaft and the pressure plate 50 move synchronously, thereby causing the measuring shaft 21 of the gauge head 20 to be displaced to achieve the measurement of the tensioning force. The transmission structure is simple. In other embodiments, a boss can also be set on the main shaft to form a force transmission part for pushing the pressure plate. In other embodiments, the pressure plate can also be connected to the main shaft through a bearing, so that the main shaft can drive the pressure plate to move up and down without affecting the rotation of the main shaft, and the bearing forms a force transmission part.

[0026] The lower end of the transmission body away from the adjustment shaft 41 is coaxially connected with a knob 45, the lower end of the main shaft 42 of the transmission body is connected to the connecting shaft 44, the lower end of the connecting shaft 44 is connected to the knob 45, and the lower end of the housing 10 is provided with an avoidance space for the knob 45 to be exposed. The differential head 43, the main shaft 42, the connecting shaft 44, and the knob 45 are connected by a pin to prevent rotation. By rotating the knob 45, the differential head 43, the main shaft 42, and the connecting shaft 44 can be driven to rotate synchronously. The structure is simple and easy to operate. In other embodiments, the knob can also be made non-coaxial with the connecting shaft and the main shaft of the transmission body, and the knob is rotatably mounted on the housing. The knob is a gear structure, and the lower end of the connecting shaft is provided with a matching tooth that matches the gear structure, and the axial length of the matching tooth meets the movement requirement of the transmission body relative to the knob to keep the gears engaged, and the knob drives the connecting shaft to rotate through the gear structure.

[0027] An upper guide seat 13 and a lower guide seat 14 are fixed to the rear side of the main fixing plate 11. The upper part of the main shaft 42 is inserted into the guide seat, and the lower part is inserted into the lower guide seat 14 to guide the transmission shaft when it moves up and down. The lower end of the main shaft 42 passes through the lower guide seat 14 downward and is threadedly connected with an adjusting nut 48. The lower guide seat 14 constitutes a limiting structure for limiting the axial position of the main shaft 42. The adjusting nut 48 is used to form a stop fit with the lower guide seat 14 to limit the upward movement of the transmission shaft.

[0028] The main shaft 42 and the connecting shaft 44 are separately arranged. The lower part of the main shaft 42 is provided with a socket for the upper end of the connecting shaft 44 to be inserted. The diameter of the connecting shaft 44 is smaller than the diameter of the main shaft 42. The lower end of the main shaft 42 is non-rotatably connected to the upper end of the connecting shaft 44. The split structure is adopted for easy processing and manufacturing.

[0029] The portion of the main shaft 42 between the upper guide seat 13 and the lower guide seat 14 is provided with an annular stop 49, and a main spring 47 is provided between the stop 49 and the lower guide seat 14. The main spring 47 is sleeved on the main shaft 42, and one end of the main spring 47 abuts against the stop 49, and the other end abuts against the lower guide seat 14. The main spring 47 constitutes a return spring between the housing and the transmission body. The return spring constitutes an elastic member for maintaining the upper and lower positions of the transmission body relative to the housing when no external force is applied. When adjusting the length of the transmission shaft, the axial position of the adjustment shaft relative to the housing is changed without changing the axial position of the transmission body relative to the housing. The main spring 47 can reset the dynamic pressure body 30 when the tension meter is not subjected to force.

[0030] The lower guide seat 14 constitutes a limit seat provided on the side of the housing away from the dynamic pressure body 30 of the stopper 49. The lower guide seat 14 is provided with a through hole for the main shaft 42 of the transmission body to pass through, and the through hole is a guide hole. The main spring 47 is sleeved on the part of the main shaft 42 located between the stopper 49 and the lower guide seat 14. The adjusting nut 48 is located on the lower side of the lower guide seat 14. When the tension meter is not subjected to external force, the adjusting nut 48 forms a stop fit with the lower guide seat 14 under the elastic force of the main spring 47. By screwing the adjusting nut 48, the distance between the adjusting nut 48 and the stopper 49 can be changed, thereby changing the distance between the stopper 49 and the lower guide seat 14, thereby changing the contact pressure between the main spring 47 and the stopper 49 and the lower guide seat 14, and changing the pre-compression amount of the main spring 47. The preload of the main spring 47 is adjusted by screwing the adjusting nut 48 to keep the preload of the main spring 47 at the set value. The main springs of different tension gauges can maintain a consistent preload, which can compensate for the impact of different spring length errors, improve product consistency, and use the same specification of the header. The preload of the main spring is the elastic force generated by the top pressure of the baffle and the lower guide seat in the natural state. The preload is calculated in advance through the header calibration, so that when the header is at zero position, the tension gauge is in a natural state without force. In other embodiments, when the measurement accuracy requirement is not high and the spring size deviation is very small, the adjusting nut may not be provided, but a fixed retaining ring is provided on the main shaft to cooperate with the limit seat for axial limitation.

[0031] A fine-tuning spring 46 is mounted on the connecting shaft 44 of the transmission body, and the lower end surface of the main shaft 42 constitutes an abutment surface on the transmission body for the fine-tuning spring 46 to abut. A fine-tuning abutment seat 15 is installed on the rear side surface of the main fixed plate 11 of the housing. The fine-tuning abutment seat 15 is adjustable in the axial direction of the transmission shaft. The fine-tuning abutment seat 15 is located on the side of the lower end surface of the main shaft 42 away from the dynamic pressure body 30. One end of the fine-tuning spring 15 abuts on the lower end surface of the main shaft 42, and the other end abuts on the fine-tuning abutment seat 15. The part of the fine-tuning abutment seat 15 used for fixing with the main fixed plate 11 is provided with a fine-tuning long hole extending up and down, and the main fixed plate 11 is provided with a fixing hole corresponding to the fine-tuning long hole. The fixing bolt is connected with the fixing hole through the fine-tuning long hole, and the upper and lower positions of the fine-tuning abutment seat 15 are changed by loosening the fixing bolt. The pre-compression amount of the fine-tuning spring 46 can be changed by adjusting the position of the fine-tuning abutment seat 15. Since the elastic coefficients of different main springs 47 have deviations, different pressure values ​​will appear for the same compression amount. In order to ensure the consistency of the tension meter products, the pre-compression amount of the fine-tuning spring can be adjusted to compensate for the influence of the elastic coefficient deviation of the main spring on the measurement accuracy, so that when different tension meter products measure the tension, the pressure provided by the main spring and the fine-tuning spring is the same when the transmission shaft moves down by the same displacement, and then the measurement value displayed on the header is consistent. The spring pressure per unit displacement is changed by fine-tuning to ensure the measurement value displayed on the header, rather than by adjusting the header scale division. The header dial scale can be mass-produced. In other implementations, it is also possible to eliminate the influence of the main spring's own error on the measurement accuracy by recalibrating the header scale as needed without providing a fine-tuning spring.

[0032] A wrench 60 is rotatably connected to the housing, and the rotation axis direction of the wrench 60 is the front-to-back direction. The main body of the wrench 60 extends out of the housing 10, and the part of the wrench 60 that extends into the housing 10 is rotatably connected to the main fixed plate 11. The inner end of the wrench 60 is connected to the crank arm 62 through the connecting rod 61, and the crank arm 62 is rotatably mounted on the main fixed plate 11. The connecting rod 61 and the crank arm 62 constitute a force transmission structure for transmitting force from the wrench 60 to the transmission body. An arc structure is provided at one end of the crank arm 62, which can push the stopper 49 of the main shaft 42. By rotating the wrench 60, the main shaft 42 can be driven to move downward, thereby driving the dynamic pressing body 30 to move downward. The wrench 60 has a dodge position in its rotation stroke for driving the transmission body to move so that the dynamic pressure body 30 is away from the fixed pressure body 31 and dodges the tension object to be measured, and an initial position to be reset by the main spring 47 when not subject to external force, that is, during measurement, the dynamic pressure body 30 is driven by the wrench 60 to dodge the tension object to be measured so that the tension object to be measured can enter between the dynamic pressure body 30 and the fixed pressure body 31. After the wrench 60 is released, the dynamic pressure body 30 is moved up and pressed against the tension object to be measured by the main spring 47. In other embodiments, the wrench may not be provided, and the tension object to be measured may be dodge by directly pressing the dynamic pressure body.

[0033] The dynamic clamping body 30 and the fixed clamping body 31 both include a first clamping part and a second clamping part which are coaxially arranged. The first clamping part is a clamping column 32, which is a cylinder. The outer peripheral surface of the cylinder is used to press against the side surface of the measured tensioner in the thickness direction when measuring the measured belt-shaped tensioner. The second clamping part is a clamping wheel 33. The outer peripheral surface of the clamping wheel 33 is provided with an annular groove. The inner wall of the annular groove is an arc surface for adapting to press against the outer peripheral surface of the measured tensioner when measuring the measured rope 200-shaped tensioner. The clamping column 32 is connected to the clamping wheel 33 by screws. The clamping column 32 passes through the guide hole at the upper end of the main fixed plate 11. The clamping wheel 33 is located on the side of the main fixed plate 11 that is away from the transmission shaft. The axial direction of the clamping column 32 and the clamping wheel 33 is perpendicular to the axial direction of the transmission shaft. The axial direction of the clamping column 32 and the clamping wheel 33 is the front-back direction. The adjustment shaft 41 is fixedly connected to the clamping column 32. The use of the adjustment column and the adjustment wheel facilitates adaptation to different types of tensioning objects to be measured. In other implementations, only the pressing column may be provided.

[0034] By turning the knob 45, the connecting shaft 44, the main shaft 42, and the differential head 43 are driven to rotate synchronously. The axial displacement size of the adjusting shaft 41 can be identified through the scale lines of the differential head 43 and the scale lines of the adjusting shaft 41. When the differential head 43 moves axially, it can drive the pressure plate 50 and the measuring shaft 21 of the meter head 20 to move axially to measure the tension value. The front shell of the housing 10 is provided with an arc-shaped groove corresponding to the knob 45, and the rear shell is provided with a boss corresponding to the knob 45. After the two sides of the housing are assembled, the knob 45 is protected to prevent the knob 45 from accidentally touching and causing the transmission shaft to rotate. The handle 12 of the housing 10 is provided with a semicircular anti-slip groove. The rear side of the housing 10 is provided with a spring clip 70, which is made of manganese steel and is fixed to the housing 10 by screws for the fixed suspension function of the tension meter. The meter head 20 of the tension meter can adopt a mechanical dial indicator or a digital display dial indicator structure.

[0035] Combination Figure 6 , Figure 7 , Figure 6 The tensioned object to be measured is the transmission belt 100, and the side surface of the transmission belt 100 in the thickness direction is used to close the outer peripheral surface of the pressing column 32 of the dynamic pressing body 30 and the fixed pressing body 31. Figure 7The tension object to be measured is the rope 200, and the outer peripheral surface of the rope 200 is used to press against the inner wall of the annular groove of the clamping wheel 33 of the dynamic clamping body 30 and the fixed clamping body 31. When using the tension meter, first determine the thickness of the belt or the diameter of the wire or rope, and turn the knob 45 by hand to drive the connecting shaft 44, the main shaft 42, and the differential head 43 to rotate. The relative rotation of the differential head 43 and the adjustment shaft 41 is used to adjust the movement of the dynamic clamping body 30 relative to the fixed clamping body 31; press the wrench 60 to transmit the thrust to the connecting rod 61 and the crank arm 62, and the crank arm 62 rotates around the axis to push the main shaft 42 to move downward, so that the transmission belt 1 00 is placed between the clamping column 32 of the dynamic clamping body 30 and the clamping column 32 of the fixed clamping body 31. If it is a wire or rope 200, it is placed between the clamping wheel 33 of the dynamic clamping body 30 and the clamping wheel 33 of the fixed clamping body 31; loosen the wrench 60, and the main spring 47 relies on its own elastic force to move the main shaft 42 and the adjusting shaft 41 upward, pushing the tension object to be measured to be tensioned; read the tension value displayed on the head 20 of the tension meter as the measurement result; The tension meter can accurately and directly detect the tension force when there is a requirement for tension in belts, wires, ropes and other environments. It can also adapt to various heights or diameters of the tensioned objects through the instrument's own adjustment function, and has high versatility.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tension meter, comprising a housing and a gauge head mounted on the housing, wherein the housing is provided with a fixed pressure body and a dynamic pressure body for cooperating with a tension object to be measured, and a transmission structure is provided between the dynamic pressure body and the gauge head to transmit force to the gauge head when the dynamic pressure body moves, wherein: The transmission structure includes a transmission shaft extending along the moving direction of the dynamic pressure body, the transmission shaft includes a transmission body and an adjusting shaft, the dynamic pressure body is fixed to the adjusting shaft, the transmission body is provided with a force transmission part for transmitting force to the gauge head when the transmission shaft moves, the tension meter includes an elastic part for maintaining the position of the transmission body relative to the casing when not subjected to external force, and the adjusting shaft is adjustably connected to the transmission body in the moving direction of the dynamic pressure body so as to change the position of the dynamic pressure body relative to the fixed pressure body by changing the position of the adjusting shaft relative to the transmission body.

2. The tensiometer according to claim 1, characterized in that: The adjusting shaft is threadedly connected to the transmission body, and a guide structure for guiding the dynamic pressing body to move is provided on the casing. The adjusting shaft is driven to move axially by rotating the transmission body to change the position of the adjusting shaft relative to the transmission body.

3. The tensiometer according to claim 2, characterized in that: An axial scale is arranged on the adjusting shaft.

4. The tensiometer according to claim 3, characterized in that: The transmission body is provided with a circle of circumferential scales matching the axial scales. When the transmission body rotates one circle, the axial displacement of the adjustment shaft is the graduation value of one axial scale.

5. The tensiometer according to claim 4, characterized in that: A differential head is provided at one end of the transmission body, the circumferential scale is set on the differential head, the adjustment shaft passes through the differential head, and a pressure plate is fixed to the measuring shaft of the meter head. The differential head is provided with a pressing end surface for pressing the pressure plate when the dynamic pressing body moves relative to the fixed pressing body, and the pressing end surface constitutes the force transmission part.

6. The tensiometer according to any one of claims 2 to 5, characterized in that: A knob is coaxially connected to one end of the transmission body away from the adjusting shaft, and a avoiding space for the knob to be exposed is arranged on the casing.

7. The tensiometer according to any one of claims 1 to 5, characterized in that: A baffle is provided on the transmission body, and a limit seat is provided on the casing on a side of the baffle away from the dynamic pressure tightening body. A through hole is provided on the limit seat for the transmission body to pass through. A portion of the transmission body located between the baffle and the limit seat is provided with a reset spring, and both ends of the reset spring are respectively used to abut the baffle and the limit seat. The reset spring constitutes the elastic member. The portion of the transmission body passing through the limit seat is threadedly connected with an adjusting nut. When the tension meter is not subjected to external force, the adjusting nut is acted upon by the reset spring and forms a stop fit with the limit seat so as to change the contact pressure between the reset spring and the baffle and the limit seat by screwing the adjusting nut.

8. The tensiometer according to any one of claims 1 to 5, characterized in that: A contact surface is provided on the transmission body, and a fine-tuning abutment seat is adjustably provided on the casing in the axial direction of the transmission shaft. The fine-tuning abutment seat is located on the side of the abutment surface away from the dynamic pressure body. A fine-tuning spring is mounted on the transmission body, and one end of the fine-tuning spring abuts on the abutment surface and the other end abuts on the fine-tuning abutment seat so as to change the pre-compression amount of the fine-tuning spring by adjusting the position of the fine-tuning abutment seat.

9. The tensiometer according to any one of claims 1 to 5, characterized in that: Both the dynamic pressing body and the fixed pressing body include a first pressing part and a second pressing part which are coaxially arranged. The first pressing part is a cylinder and the outer circumferential surface of the cylinder is used to press against the side surface of the measured tensioner in the thickness direction when measuring a belt-shaped tensioner. The outer circumferential surface of the second pressing part is provided with an annular groove and the inner wall of the annular groove is an arc surface for adapting to press against the outer circumferential surface of the measured tensioner when measuring a rope-shaped tensioner.

10. The tensiometer according to any one of claims 1 to 5, characterized in that: A wrench is rotatably connected to the casing, and the wrench is connected to a force transmission structure for transmitting force to the transmission body. A reset spring is provided between the casing and the transmission body, and the reset spring constitutes the elastic member. The wrench has an avoidance position in its rotation stroke for driving the transmission body to move the dynamic pressure body away from the fixed pressure body to avoid the measured tensioning object, and an initial position reset by the reset spring when not subject to external force.

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