A linear measuring device and a measuring method for a prefabricated cap beam

Abstract

A linear measuring device and a measuring method for a prefabricated cap beam, belonging to the field of cap beam measurement technology, including a support unit, a measuring device including a base, two vertical plates are vertically and fixedly installed on the base, and the two vertical plates are symmetrically arranged relative to the base. The measuring device also includes a measuring unit, and the measuring unit includes a first measuring mechanism for measuring the horizontal length and a second measuring mechanism for measuring the inclination angle. The present invention can realize the linear measurement of the horizontal length and the side inclination angle of the cap beam, and the measurement of the horizontal length and the side inclination angle is measured by the same device without the need to replace the equipment, and one-time positioning can meet the detection requirements in two directions. Compared with the method of positioning and measuring separately in two directions, it has higher accuracy, avoids positioning errors generated in the process of positioning separately, and can better ensure the accuracy of the cap beam measurement results. After the positioning block is embedded from left to right to the bottom end of the limit column, it can realize automatic positioning.

Description

Technical Field

[0001] The invention belongs to the technical field of cap beam measurement, and in particular relates to a linear measurement device for a prefabricated cap beam and a measurement method thereof. Background Art

[0002] Cap beam refers to the beam installed on the top of the frame pile pier to support, distribute and transfer the load of the superstructure, also known as cap beam. In order to improve construction efficiency, prefabricated components are often used in the construction of highway viaducts. Prefabricated components are produced in prefabrication processing plants and transported to the construction site. They are connected by cast-in-place, sleeve grouting and other methods. Compared with cast-in-place components, the use of prefabricated components in bridge projects saves the use of formwork and shortens construction time. It has great advantages, but it also comes with the requirement for its accuracy. The size and position of prefabricated components must meet the connection conditions, which is a problem that needs to be solved.

[0003] Related art (publication number CN112227213B) discloses a method and a guide frame for prefabricated assembly of assembled cap beams and columns. The method includes marking the positions of four theoretical installation points on a pedestal for installing the column, and then erecting the guide frame on the top surface of the column. The central axis of the four guide arms of the guide frame intersects with the axis of the steel bars at the four top corners on the top surface of the column. The projection of one end point of each guide arm on the top surface of the pedestal extends beyond the projection area of ​​the column cross section on the pedestal. The projection position of the end point of each guide arm on the pedestal is marked, and the position is the actual installation point position of the column. The distance between each theoretical installation point and the corresponding actual installation point is measured, and compared with a distance threshold related to the steel bar diameter in the column and the inner diameter of the cap beam sleeve. If the condition that each distance is less than or equal to the distance threshold is not met, the horizontal position of the column is adjusted until each distance is less than or equal to the distance threshold.

[0004] The above technical scheme mainly measures, assembles and guides the size and position of the assembly of the cap beam and the column. However, before the cap beam is put into use, linear measurements of the horizontal length and the side inclination angle are required to detect whether the finished cap beam meets the requirements. Therefore, it is necessary to propose a special device to perform linear measurements on the prefabricated cap beam. Summary of the invention

[0005] In view of the problem in the prior art that before the cap beam is put into use, it is necessary to perform linear measurement of the horizontal length and the side inclination angle to detect whether the finished cap beam meets the requirements, the present invention provides a prefabricated cap beam linear measurement device and a measurement method thereof, which can realize the linear measurement of the horizontal length and the side inclination angle of the cap beam, and the horizontal length and the side inclination angle are measured by the same device without the need to replace the equipment, and one-time positioning can meet the detection requirements in two directions. Compared with the method of positioning and measuring in two directions separately, it has higher accuracy, avoids positioning errors generated in the process of separate positioning, and can better ensure the accuracy of the cap beam measurement results. Its specific technical scheme is as follows:

[0006] A prefabricated cap beam linear measuring device, comprising a supporting unit, the measuring device comprising a base, two vertical plates are vertically and fixedly mounted on the base, the two vertical plates are arranged symmetrically with respect to the base, the measuring device further comprises a measuring unit, the measuring unit comprises a first measuring mechanism for measuring a horizontal length and a second measuring mechanism for measuring an inclination angle, the first measuring mechanism and the second measuring mechanism are driven by the same driving mechanism;

[0007] The driving mechanism comprises a driving shaft, a first bevel gear is fixedly mounted on the driving shaft, a motor is connected to the right end of the driving shaft, and the output end of the motor is connected to the right end of the driving shaft, a supporting frame is mounted on the bottom end of the motor, a first moving block is fixedly mounted on the bottom end of the supporting frame, a first limiting groove is provided on the base, the first moving block is slidably embedded in the first limiting groove, a cylinder is mounted on the base, and the output end of the cylinder is connected to the right side wall of the first moving block;

[0008] Wherein, the driving shaft slides in the horizontal direction and penetrates the outer walls of the two vertical plates.

[0009] In the above technical solution, the first measuring mechanism includes a first screw connected to the vertical plate in a horizontal direction, and the first screw is provided with external threads in opposite directions and symmetrically on the left and right sides, and two second limiting grooves are symmetrically provided on the left and right sides of the upper surface of the base, and a second moving block is slidably embedded in each of the second limiting grooves, and two moving seats are respectively symmetrically provided on the left and right sides of the first screw, and the moving seats are fixedly connected to the second moving blocks at corresponding positions;

[0010] Wherein, a third bevel gear is fixedly mounted on the first screw rod, and in the first state, the third bevel gear is meshed and connected with the left side wall of the first bevel gear.

[0011] In the above technical solution, the first measuring mechanism further comprises a first vertical plate fixedly and vertically mounted above the right side moving seat, a first mounting frame fixedly mounted on the top of the first vertical plate, a second vertical plate fixedly and vertically mounted above the left side moving seat, a positioning frame mounted on the top of the second vertical plate, a second mounting frame mounted on the top of the positioning frame, and a tip is respectively arranged on the second mounting frame and the first mounting frame;

[0012] Wherein, the left side wall of the first vertical plate and the tip of the top end of the first mounting frame are located on the same vertical line.

[0013] In the above technical solution, a rangefinder is placed in the positioning frame, a positioning bolt is threadedly arranged at the top of the positioning frame, and the bottom end of the positioning bolt is threadedly passed through the positioning frame and extends into the positioning frame, and the bottom end of the positioning bolt is in contact with the upper surface of the rangefinder;

[0014] Wherein, the output end of the rangefinder and the tip of the top end of the second mounting bracket are located on the same vertical line.

[0015] In the above technical solution, the second measuring mechanism includes a second screw connected to the vertical plate in a horizontal direction, and the second screw is provided with external threads in opposite directions and symmetrically on the left and right sides, and two movable plates are respectively provided with symmetrical threads on the left and right sides of the second screw, each of the movable plates is provided with a through groove from left to right, and a rack is fixedly installed on each of the movable plates, the rack on the left side is slidably embedded in the second mounting frame in the horizontal direction, and the rack on the right side is slidably embedded in the first mounting frame in the horizontal direction;

[0016] Wherein, a second bevel gear is fixedly mounted on the second screw rod, and in the second state, the second bevel gear is meshedly connected with the right side wall of the first bevel gear.

[0017] In the above technical solution, the bottom ends of the inner walls of the second mounting frame and the first mounting frame are respectively installed with limit seats, and the bottom ends of the two racks are respectively fixedly installed with moving bars, and each moving bar is slidably embedded in the limit seat at the corresponding position.

[0018] In the above technical solution, the second measuring mechanism also includes a rotating shaft rotatably connected to the top of the second mounting frame and the top of the first mounting frame respectively, an incomplete gear and a measuring rod are fixedly mounted on the rotating shaft, the incomplete gear is meshingly connected with the rack, the front side walls of the second mounting frame and the first mounting frame are respectively mounted with a protractor, a pointer is mounted at the front end of the rotating shaft, and the rotating shaft, the pointer at the front end of the rotating shaft, and the measuring rod all rotate relative to the center of the protractor.

[0019] In the above technical solution, the support unit includes a stand, a limiting column is vertically installed in the middle of the front side of the stand, and a self-locking mechanism connected to the base is provided at the bottom end of the limiting column;

[0020] The self-locking mechanism includes a giving groove opened at the bottom end of the left side wall of the limiting column, a limiting plate is arranged above the giving groove for lifting and lowering movement, the limiting plate is slidably arranged on the limiting column, an inclined surface is arranged on the left side of the bottom end of the limiting plate, and the inclined surface is inclined from left to right with a downward trend, a spring is installed under the limiting plate, and the bottom end of the spring is connected to the surface of the limiting column, a telescopic rod is arranged in the spring, and the two ends of the telescopic rod are respectively connected to the limiting plate and the limiting column, a positioning block is fixedly installed in the middle part of the front side wall of the base, and the positioning block is embedded in the inner cavity of the bottom end of the limiting column;

[0021] A lifting assembly is arranged on the limiting plate, and the lifting assembly comprises a connecting pin fixedly mounted on the limiting plate, a lifting plate is fixedly mounted on the top of the connecting pin, and a groove is arranged at the bottom end of the lifting plate.

[0022] In the above technical solution, the support unit further comprises a plurality of connecting columns vertically mounted on the bottom end of the platform, a base frame is fixedly mounted on the bottom end of the connecting column, a bottom plate is fixedly mounted on the rear side of the base frame, a connecting plate is fixedly mounted between the bottom plate and the platform, a counterweight is mounted between the connecting plate and the bottom plate, and a counterweight is placed on the bottom plate;

[0023] A cap beam is placed in the platform, the intersection of the bottom edge and the side edge of the cap beam is an intersection edge, a hook is arranged at the top end of the intersection edge, and a lifting rope is hooked at the top end of the hook.

[0024] The present invention further provides a measurement method, comprising the prefabricated cap beam linear measurement device described in any one of the items, comprising the following steps:

[0025] S1: Place and position the cap beam to ensure that the cap beam is stably and straightly placed in the stand;

[0026] S2: Position the measuring device on the front side of the cap beam to ensure that the center of the measuring device is in line with the center of the cap beam;

[0027] S3: Adjust the two tips on the left and right sides to correspond to the two intersection edges respectively;

[0028] S4: adjusting the measuring device to the first state to measure the horizontal length of the bottom edge of the cap beam;

[0029] The measuring device is adjusted to the second state to measure the inclination angle of the cap beam side plate;

[0030] Among them, the first state and the second state are adjusted as needed, in no particular order;

[0031] S5: After the measurement is completed, the measuring device is separated from the limit column to end the measurement.

[0032] Compared with the prior art, the prefabricated cap beam linear measurement device and the measurement method of the present invention have the following beneficial effects:

[0033] 1. With regard to the problem that before the cap beam is put into use, it is necessary to perform linear measurement of the horizontal length and the side inclination angle to detect whether the finished cap beam meets the requirements, the present invention can measure the horizontal length of the bottom side of the cap beam through the cooperation of the rangefinder and the first vertical plate, and can realize the measurement of the bottom side and the side inclination angle of the cap beam by rotating the measuring rod relative to the rotating shaft, and the horizontal length and the side inclination angle are measured by the same device, without the need to replace the device;

[0034] Second, the present invention can achieve the correspondence between the measuring device and the cap beam by adjusting the tip to the intersection edge of the corresponding cap beam, and there is no need to move the measuring device later, that is, it can achieve linear measurement of the horizontal length of the cap beam and the side inclination angle. Its one-time positioning can meet the detection requirements in two directions. Compared with the method of positioning and measuring separately in two directions, it has higher accuracy, avoids positioning errors generated in the process of separate positioning, and can better ensure the accuracy of the cap beam measurement results;

[0035] 3. The present invention can drive the third bevel gear or the second bevel gear to rotate respectively through the movement of the driving shaft, the first bevel gear, the motor, the supporting frame, and the first moving block, so as to realize the first screw rod or the second screw rod to rotate successively, so as to realize the successively measurement of the horizontal length of the bottom edge of the cap beam and the inclination angle of the side edge of the cap beam;

[0036] Fourth, the present invention realizes the relative displacement adjustment of the two moving seats on the first screw by rotating the first screw, realizes the adjustment and positioning of the distance meter relative to the intersection edge position, and realizes the measurement of the horizontal length of the bottom edge of the cap beam with the help of the distance meter;

[0037] 5. The present invention realizes the adjustment of the relative positions of the two moving plates and the two racks by rotating the second screw rod, thereby realizing the relative rotation of the two measuring rods, and realizing the rotation of the two measuring rods close to the side of the cap beam, and realizing the measurement of the inclination angle of the side of the cap beam by using the supplementary angle property of the straight angle;

[0038] 6. The present invention can make the tip of the top of the second mounting frame and the tip of the top of the first mounting frame correspond to the two intersection edges on the left and right sides of the connecting pin respectively through the first screw rod and the two symmetrically arranged movable seats, thereby ensuring that the reference point remains unchanged when the equipment subsequently measures the horizontal length and the inclination angle;

[0039] 7. The present invention can promote the synchronous movement of the left and right racks in relative directions through the second screw and the two symmetrical moving plates, so as to realize the rotation of the incomplete gears, measuring rods and rotating shafts on the left and right sides at the same angle, thereby realizing the measurement of the inclination angles of the left and right sides of the cap beam;

[0040] 8. The present invention can realize the collinear alignment of the measuring device and the vertical center axis of the cap beam by positioning the positioning block in the limit column, that is, ensuring that the center point of the measuring device is collinearly aligned with the center point of the cap beam, thereby ensuring that the two moving seats and two moving plates of the subsequent measuring equipment can move equidistantly to both sides relative to the center point of the cap beam, avoiding the problem that the measuring device is deflected relative to the cap beam and affects the accuracy of the detection result;

[0041] IX. The present invention can realize automatic positioning after the positioning block is embedded from left to right to the bottom end of the limiting column through the coordination of the giving groove, the limiting piece, the inclined surface, the spring and the telescopic rod. The positioned positioning block can ensure that the center point of the measuring device corresponds to the center point of the cap beam. The present invention can realize automatic alignment and locking of the center point of the measuring device and the cap beam, without the need for manual redundant positioning and alignment steps between the measuring device and the cap beam, thus saving measurement time and improving measurement efficiency.

[0042] 10. The present invention can automatically limit the positioning block after the positioning block enters the inner cavity at the bottom end of the limiting column along the inclined surface through the arrangement of the spring and the telescopic rod. Through the connecting pin, the lifting piece and the groove, the limiting piece and the inclined surface can be driven to separate from the limiting of the positioning block by lifting the lifting piece, so as to realize the separation of the measuring device from the front side of the cap beam after use.

[0043] 11. The present invention can support the stand through the connecting column, the base frame, the bottom plate and the connecting plate, so as to keep the stand away from the ground, and leave enough space for the cap beam to be placed on the stand, so as to allow the measuring equipment to detect the horizontal length of the bottom side of the cap beam and the inclination angle of the side side;

[0044] 12. The present invention reinforces the auxiliary connection between the bottom plate and the connecting plate by setting a reinforcement frame, so as to make the position between the bottom plate and the connecting plate more stable, thereby achieving a more stable position of the stand, and by setting a counterweight block, it can ensure that the stand stably supports the cap beam, and prevent the stand and the cap beam from tipping forward;

[0045] 13. The present invention is provided with a hook and a lifting rope, which can be used to hoist the cap beam and place it in the stand, so that the cap beam is at a sufficient distance from the ground for subsequent measurement work;

[0046] In summary, the present invention can realize the linear measurement of the horizontal length and the lateral inclination angle of the cap beam, and the measurement of the horizontal length and the lateral inclination angle is carried out by the same device, without the need to replace the equipment, and one-time positioning can meet the detection requirements in two directions. Compared with the method of separately positioning and measuring in two directions, it has higher accuracy, avoids the positioning error generated in the process of separate positioning, and can better ensure the accuracy of the cap beam measurement result. In addition, the positioning block can realize automatic positioning after being embedded from left to right to the bottom end of the limit column. The positioned positioning block can ensure that the measuring device corresponds to the center point of the cap beam, that is, realize automatic alignment and locking limit of the measuring device and the center point of the cap beam, and there is no need to manually perform unnecessary positioning and alignment steps between the measuring device and the cap beam, thereby saving measurement time and improving measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a front view of the base of the present invention;

[0048] Figure 2 It is a structural schematic diagram of the intersection edge of the present invention;

[0049] Figure 3 is a schematic structural diagram of the first bevel gear of the present invention;

[0050] Figure 4 for Figure 2 A magnified image of point A;

[0051] Figure 5 It is a structural schematic diagram of the limiting column of the present invention;

[0052] Figure 6 It is a structural schematic diagram of the supporting frame of the present invention;

[0053] Figure 7 for Figure 5 A magnified view of point B;

[0054] Figure 8 It is a structural schematic diagram of the measuring rod of the present invention;

[0055] Fig. 9 It is a structural schematic diagram of the rangefinder of the present invention;

[0056] Fig.10 It is a structural schematic diagram of the limit seat of the present invention;

[0057] Fig.11 It is a rear view of the reinforcement frame of the present invention;

[0058] Figures 1 to 111. stand, 2. base, 3. vertical plate, 4. drive shaft, 5. first bevel gear, 6. motor, 7. supporting frame, 8. first moving block, 9. first limiting groove, 10. cylinder, 11. first screw, 12. second limiting groove, 13. second moving block, 14. moving seat, 15. first vertical plate, 16. first mounting frame, 17. second vertical plate, 18. positioning frame, 19. second mounting frame, 20. tip, 21. rangefinder, 22. positioning bolt, 23. second screw, 24. second bevel gear, 25. moving plate, 26. through groove , 27. rack, 28. limit seat, 29. moving bar, 30. rotating shaft, 31. incomplete gear, 32. measuring rod, 33. protractor, 34. limit column, 35. clearance groove, 36. limit plate, 37. inclined plane, 38. spring, 39. telescopic rod, 40. connecting pin, 41. lifting plate, 42. groove, 43. connecting column, 44. positioning block, 45. bottom plate, 46. connecting plate, 47. reinforcement frame, 48. counterweight, 49. cap beam, 50. intersection edge, 51. hook, 52. lifting rope, 53. third bevel gear, 54. bottom frame. DETAILED DESCRIPTION

[0059] The following is a combination of specific implementation cases and attached Figures 1 to 11 The present invention is further described below, but the present invention is not limited to these embodiments.

[0060] See also Figures 1 to 11 As shown, a prefabricated cap beam linear measuring device includes a supporting unit, and the cap beam is supported by the supporting unit so as to linearly measure the horizontal length of the bottom side and the side inclination angle of the cap beam. The measuring device includes a base 2, and two vertical plates 3 are vertically and fixedly installed on the base 2. The two vertical plates 3 provide support for the installation of other components. The two vertical plates 3 are symmetrically arranged relative to the base 2. The measuring device also includes a measuring unit, and the measuring unit includes a first measuring mechanism for measuring the horizontal length and a second measuring mechanism for measuring the inclination angle. The first measuring mechanism and the second measuring mechanism are driven by the same driving mechanism, and the first measuring mechanism and the second measuring mechanism are driven successively by the same driving mechanism respectively, without replacing the equipment. The method of linearly measuring the horizontal length of the bottom side and the side inclination angle of the cap beam by the same equipment can better ensure the accuracy of the detection result, and the measuring equipment does not need to be moved after positioning, that is, the linear measurement of the horizontal length of the cap beam and the side inclination angle can be realized, and its one-time positioning can meet the detection requirements in two directions, and the method of positioning and measuring in two directions separately has higher accuracy, avoids the positioning error generated in the positioning process, and can better ensure the accuracy of the cap beam measurement result;

[0061] Specific reference Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the driving mechanism includes a driving shaft 4, on which a first bevel gear 5 is fixedly mounted, a motor 6 is connected to the right end of the driving shaft 4, and an output end of the motor 6 is connected to the right end of the driving shaft 4, and the driving shaft 4 and the first bevel gear 5 can be driven to rotate circumferentially by turning on the motor 6, a supporting frame 7 is installed at the bottom end of the motor 6, the motor 6 is supported by the supporting frame 7, and the movement of the supporting frame 7 can drive the motor 6 to move synchronously, thereby adjusting the position of the first bevel gear 5, and a first moving block is fixedly mounted at the bottom end of the supporting frame 7 8. A first limiting groove 9 is provided on the base 2, and the first moving block 8 is slidably embedded in the first limiting groove 9. A cylinder 10 is installed on the base 2, and the output end of the cylinder 10 is connected to the right side wall of the first moving block 8. When the cylinder 10 is turned on, it can drive the first moving block 8 to move, and then drive the supporting frame 7, the motor 6 and the first bevel gear 5 to move in the horizontal direction; wherein, the driving shaft 4 slides in the horizontal direction and penetrates the outer walls of the two vertical plates 3, thereby ensuring that the driving shaft 4 can move in the horizontal direction without being interfered with or affected by the vertical plates 3.

[0062] Main references Figure 6 As shown, the first measuring mechanism includes a first screw rod 11 which is rotatably connected to the vertical plate 3 through a bearing in the horizontal direction, and the first screw rod 11 is provided with external threads in opposite directions and symmetrically on the left and right sides, and two second limiting grooves 12 are symmetrically provided on the left and right sides of the upper surface of the base 2, and a second moving block 13 is slidably embedded in each second limiting groove 12, and two moving seats 14 are symmetrically provided with thread sleeves on the left and right sides of the first screw rod 11, and the moving seats 14 are fixedly connected to the second moving blocks 13 at the corresponding positions. The rotating first screw rod 11 drives the two symmetrical moving seats 14 on the left and right to move synchronously outward or toward the middle, and at this time, the second moving block 13 at the bottom of the moving seat 14 moves along the corresponding The second limiting groove 12 in the position is moved to limit the moving direction of the moving seat 14; wherein, a third bevel gear 53 is fixedly mounted on the first screw rod 11. In the first state, the third bevel gear 53 is meshed and connected with the left side wall of the first bevel gear 5, and the first bevel gear 5 is meshed and connected with the third bevel gear 53. The driving shaft 4 and the first bevel gear 5 are driven by the turned-on motor 6 to rotate synchronously, so as to prompt the third bevel gear 53 to drive the first screw rod 11 to rotate synchronously. Since the left and right sides of the first screw rod 11 are provided with external threads in opposite directions and symmetrically, the rotating first screw rod 11 drives the two symmetrical moving seats 14 on the left and right to move synchronously in the direction away from the third bevel gear 53.

[0063] Main references Figure 1 , Figure 8 and Fig. 9As shown, the first measuring mechanism also includes a first vertical plate 15 fixed and vertically installed above the right moving seat 14, a first mounting frame 16 is fixedly installed on the top of the first vertical plate 15, a second vertical plate 17 is fixed and vertically installed above the left moving seat 14, a positioning frame 18 is installed on the top of the second vertical plate 17, a second mounting frame 19 is installed on the top of the positioning frame 18, and a tip 20 is respectively arranged on the second mounting frame 19 and the first mounting frame 16. The movement of the left moving seat 14 drives the second vertical plate 17, the positioning frame 18, and the second mounting frame 19 on the left to move synchronously to the left, and the movement of the right moving seat 14 drives the first vertical plate 15 and the first mounting frame 16 on the right to move synchronously to the right, until the tip 20 at the top of the second mounting frame 19 and the tip 20 at the top of the first mounting frame 16 correspond to the intersection of the bottom edge and the side edge of the cap beam respectively; wherein, the left side wall of the first vertical plate 15 and the tip 20 at the top of the first mounting frame 16 are located on the same vertical line, that is, the distance between the left tip 20 and the right tip 20, that is, the cap beam 4 9, thereby realizing the measurement of the horizontal length distance of the bottom edge of the cap beam 49; a rangefinder 21 is placed in the positioning frame 18, and a positioning bolt 22 is threadedly arranged at the top end of the positioning frame 18, and the bottom end of the positioning bolt 22 is threadedly penetrated through the positioning frame 18 and extends into the positioning frame 18, and the bottom end of the positioning bolt 22 is fitted with the upper surface of the rangefinder 21, wherein the output end of the rangefinder 21 and the tip 20 at the top end of the second mounting frame 19 are located on the same vertical line, and since the left side wall of the first vertical plate 15 and the tip 20 at the top end of the first mounting frame 16 are located on the same vertical line, the distance between the output end of the rangefinder 21 and the left side wall of the first vertical plate 15 is the distance between the left tip 20 and the right tip 20, that is, the distance of the horizontal length of the bottom edge of the cap beam; in the present invention, the rangefinder 21 is a phase method laser ranging device commonly used in the existing market, which detects the distance by detecting the phase difference between the emitted light and the reflected light when propagating in space. It is an existing device, and its principle and model are not limited or repeated here.

[0064] Main references Figure 1 , Figure 6 , Fig. 9The second measuring mechanism includes a second screw rod 23 connected to the vertical plate 3 by a bearing in a horizontal direction, and the second screw rod 23 is provided with external threads in opposite directions and symmetrically on the left and right sides. The second screw rod 23 is provided with two movable plates 25 symmetrically sleeved on the left and right sides. Each movable plate 25 is provided with a through groove 26 from left to right. A rack 27 is fixedly installed on each movable plate 25. The rack 27 on the left side is embedded in the second mounting frame 19 in a horizontal direction, and the rack 27 on the right side is embedded in the first mounting frame 16 in a horizontal direction. Among them, a second bevel gear 24 is fixedly installed on the second screw rod 23. In the second state, the second bevel gear 24 is fixedly installed on the second screw rod 23. The wheel 24 is meshed with the right side wall of the first bevel gear 5, and the first moving block 8 is driven to move to the right side by the turned-on cylinder 10, so as to prompt the supporting frame 7 and the motor 6, the driving shaft 4 and the first bevel gear 5 to move to the right side, prompting the first bevel gear 5 to disengage from the outer wall of the third bevel gear 53 and mesh with the outer wall of the second bevel gear 24. At this time, it is in the second state, and the turned-on motor 6 drives the driving shaft 4 and the first bevel gear 5 to rotate, driving the second bevel gear 24 to rotate, so that the two moving plates 25 symmetrically threadedly connected on the left and right sides of the second bevel gear 24 can move synchronously outward, driving the rack 27 and the moving bar 29 at the corresponding position to move synchronously outward.

[0065] Main references Fig.10 As shown, the second mounting frame 19 and the first mounting frame 16 are respectively installed with a limit seat 28 at the bottom end of the inner wall, and the two racks 27 are respectively fixed with a moving bar 29 at the bottom end. Each moving bar 29 is slidably embedded in the limit seat 28 at the corresponding position. When the rack 27 moves, it can drive the moving bar 29 to move along the limit seat 28 at the corresponding position. The moving direction of the moving bar 29 is limited by the limit seat 28 to realize the stable horizontal movement of the rack 27.

[0066] Main references Figure 1 , Figure 8 , Fig. 9 and Fig.10As shown, the second measuring mechanism also includes a rotating shaft 30 which is rotatably connected to the top of the second mounting frame 19 and the first mounting frame 16 through bearings, and an incomplete gear 31 and a measuring rod 32 are fixedly mounted on the rotating shaft 30. The incomplete gear 31 is meshed with the rack 27. The second mounting frame 19 and the front side wall of the first mounting frame 16 are respectively mounted with a protractor 33. In the present invention, the protractor 33 is a 360-degree protractor commonly used on the market, wherein the protractor 33 is provided with a pointer coaxial with the rotating shaft 30. The pointer rotates along the surface of the protractor 33, which is the rotation angle of the measuring rod 32. With the help of the supplementary angle property of the straight angle, the measurement of the inclination angle of the side of the cap beam 49 is realized; a pointer is mounted at the front end of the rotating shaft 30. The pointer at the front end of the rotating shaft 30 and the measuring rod 32 rotate relative to the center of the protractor 33. When the rack 27 and the moving bar 29 at the corresponding positions move outward synchronously, the two incomplete gears 31 on the left and right can be driven to rotate outward. When the incomplete gear 31 rotates, it drives the measuring rod 32, the rotating shaft 30, the tip 20 and the pointer on the front side of the protractor 33 to rotate synchronously until the measuring rod 32 fits the side of the cap beam. At this time, the angle of rotation of the pointer on the front side of the protractor 33 relative to the protractor 33 is the rotation angle of the measuring rod 32 relative to the side of the cap beam. With the help of the supplementary angle property of the straight angle, 180 degrees minus the rotation angle of the measuring rod 32 is the angle of the inclination angle of the side of the cap beam, thereby realizing the measurement of the inclination angle of the side of the cap beam.

[0067] Main references Figures 2 to 5 as well as Figure 7 As shown, the support unit includes a stand 1, a limiting column 34 is vertically installed in the middle of the front side of the stand 1, and a self-locking mechanism connected to the base 2 is arranged at the bottom end of the limiting column 34; the self-locking mechanism includes a clearance groove 35 opened at the bottom end of the left side wall of the limiting column 34, and a limiting plate 36 is arranged above the clearance groove 35 for lifting and moving, and the limiting plate 36 is slidably arranged on the limiting column 34, and an inclined surface 37 is arranged on the left side of the bottom end of the limiting plate 36, and the inclined surface 37 is inclined from left to right with a downward trend, a spring 38 is installed below the limiting plate 36, and the bottom end of the spring 38 is connected to the surface of the limiting column 34, a telescopic rod 39 is arranged in the spring 38, and the two ends of the telescopic rod 39 are respectively connected to the limiting plate 36 and the limiting column 34, and a positioning block 44 is fixedly installed in the middle of the front side wall of the base 2, and the positioning block 44 is embedded in the inner cavity at the bottom end of the limiting column 34;

[0068] Place the measuring device as a whole along the front side of the cap beam, and push the measuring device from left to right until the positioning block 44 touches the inclined surface 37 and drives the inclined surface 37 and the limiting plate 36 to be forced to move upward. At this time, the spring 38 is forced to stretch and the telescopic rod 39 is forced to extend. When the positioning block 44 moves to the inner cavity embedded in the bottom end of the limiting column 34, the inclined surface 37 loses the driving force. Under the action of the elastic force of the spring 38, the telescopic rod 39 is shortened as a whole, and the limiting plate 36 and the inclined surface 37 are moved downward synchronously, so that the limiting plate 36 and the inclined surface 37 return to their initial positions, and the positioning block 44 is locked and limited to achieve a stable connection relationship between the base 2 connected to the rear side of the positioning block 44 and the limiting column 34, so as to ensure the relative stability of the measuring device and the cap beam during subsequent measurements.

[0069] In addition, see Figure 4 and Figure 7 As shown, a lifting assembly is provided on the limit plate 36, and the lifting assembly includes a connecting pin 40 fixedly installed on the limit plate 36, a lifting piece 41 is fixedly installed on the top of the connecting pin 40, and a groove 42 is provided at the bottom end of the lifting piece 41. Through the setting of the groove 42, it can be more adapted to the shape of a human hand, and by placing a person's fingers on the groove 42 to lift the lifting piece 41 upward, it can be more convenient to realize that the lifting piece 41 drives the limit plate 36 to move upward. After the measuring device is used, the lifting piece 41 is lifted upward to prompt the connecting pin 40 and the limit plate 36 to move upward synchronously, so as to prompt the inclined surface 37 to break away from the limit of the positioning block 44, and drive the measuring device to move to the left as a whole, so as to realize that the positioning block 44 is separated from the inner cavity at the bottom end of the limit column 34, that is, the measuring device is separated from the limit column 34.

[0070] Main references Figure 1 and Fig.11 As shown, the support unit also includes a plurality of connecting columns 43 vertically installed at the bottom end of the platform 1, a bottom frame 54 is fixedly installed at the bottom end of the connecting column 43, a bottom plate 45 is fixedly installed on the rear side of the bottom frame 54, a connecting plate 46 is fixedly installed between the bottom plate 45 and the platform 1, a counterweight 48 is installed between the connecting plate 46 and the bottom plate 45, and a counterweight 48 is placed on the bottom plate 45. The platform 1 can be supported by the connecting columns 43, the bottom frame 54, the bottom plate 45, and the connecting plate 46, so that the platform 1 is kept away from the ground. , after the cap beam is placed on the stand 1, there is enough space for the measuring equipment to detect the horizontal length of the bottom edge and the side inclination angle of the cap beam. By setting the reinforcement frame 47, the bottom plate 45 and the connecting plate 46 are reinforced and connected to each other, so that the position between the bottom plate 45 and the connecting plate 46 is more stable, thereby achieving a more stable position of the stand 1. By setting the counterweight block 48, it can be ensured that the stand 1 stably supports the cap beam 49, so as to prevent the stand 1 and the cap beam 49 from tipping forward.

[0071] A cap beam 49 is placed in the stand 1. The intersection of the bottom edge and the side edge of the cap beam 49 is an intersection edge 50. A hook 51 is provided at the top of the intersection edge 50. A lifting rope 52 is hooked at the top of the hook 51. The end of the lifting rope 52 is hooked at the hook 51. The middle part of the lifting rope 52 is lifted up with the help of an existing lifting device to lift the cap beam 49 upward off the ground. The cap beam 49 is moved and placed in the stand 1 with the help of the lifting device, so that the cap beam 49 is placed for measurement.

[0072] Among them, the intersection edge 50 and the tip 20 are arranged correspondingly up and down, and the movable seat 14 on the left side moves to drive the second vertical plate 17, the positioning frame 18, and the second mounting frame 19 on the left side to move synchronously to the left, and the movable seat 14 on the right side moves to drive the first vertical plate 15 and the first mounting frame 16 on the right side to move synchronously to the right, until the tip 20 at the top of the second mounting frame 19 and the tip 20 at the top of the first mounting frame 16 respectively correspond to the left and right intersection edges 50, thereby realizing the positioning of the relative position of the measuring device and the intersection edge 50.

[0073] The present invention also provides a measurement method, comprising any one of the prefabricated cap beam linear measurement devices, comprising the following steps:

[0074] S1: Place and position the cap beam 49 to ensure that the cap beam 49 is stably and straightly placed in the stand 1. The stand 1 is suitable for cap beams 49 of different sizes. Cap beams 49 of different sizes sink to different depths after being placed in the stand 1, but all can be supported and positioned in the stand 1;

[0075] S2: Position the measuring device in front of the cap beam 49 to ensure that the center of the measuring device is in line with the center of the cap beam 49, so as to ensure the accuracy of the data when the subsequent measuring device detects the cap beam 49;

[0076] S3: Adjust the two tips 20 on the left and right sides to correspond to the two intersection edges 50 respectively, so as to ensure that the distance of the two tips 20 measured later is the distance between the two intersection edges 50 of the cap beam 49, that is, the distance of the horizontal length of the bottom edge of the cap beam 49;

[0077] S4: The measuring device is adjusted to the first state, and the horizontal length of the bottom side of the cap beam 49 is measured. Since the output end of the rangefinder 21 corresponds to the intersection 50 on the left side of the cap beam 49, and the left side wall of the first vertical plate 15 corresponds to the intersection 50 on the right side of the cap beam 49, the horizontal length of the bottom side of the cap beam 49 is measured by emitting a laser from the rangefinder 21 to the left side wall of the first vertical plate 15;

[0078] The measuring device is adjusted to the second state, and the inclination angle of the side plate of the cap beam 49 is measured. When the incomplete gear 31 rotates, the measuring rod 32, the rotating shaft 30, the tip 20 and the pointer on the front side of the protractor 33 are driven to rotate synchronously until the measuring rod 32 fits the side of the cap beam 49. At this time, the angle of rotation of the pointer on the front side of the protractor 33 relative to the protractor 33 is the rotation angle of the measuring rod 32 relative to the side of the cap beam 49. By means of the supplementary angle property of the straight angle, the rotation angle of the measuring rod 32 is 180 degrees minus the rotation angle of the measuring rod 32, which is the angle of the inclination angle of the side of the cap beam 49. Thus, the measurement of the inclination angle of the side of the cap beam 49 is achieved.

[0079] The first state and the second state are adjusted as needed, in no particular order, by first engaging the second bevel gear 24 with the first bevel gear 5 to rotate, and finally realizing the rotation of the two measuring rods 32, that is, first realizing the measurement of the side inclination angle of the cap beam 49, and then locking the rangefinder 21 in the positioning frame 18 by the positioning bolt 22 to perform horizontal measurement, and vice versa;

[0080] S5: After the measurement is completed, the measuring device is separated from the limit column 34 and the measurement is ended. The specific steps for separating the measuring device from the limit column 34 are as follows: by lifting the lifting plate 41 upwards, the connecting pin 40 and the limit plate 36 are prompted to move upward synchronously, so as to cause the inclined surface 37 to separate from the limit on the positioning block 44, and drive the measuring device to move to the left as a whole, so that the positioning block 44 can be separated from the inner cavity at the bottom end of the limit column 34, that is, the measuring device can be separated from the limit column 34.

[0081] In the present invention, threads are provided on the left and right sides of the first bevel gear 5, which are respectively meshed with the third bevel gear 53 and the second bevel gear 24, that is, threads are provided on the left and right sides of the first bevel gear 5. The first bevel gear 5, the third bevel gear 53 and the second bevel gear 24 are bevel gears on the market, and they are not described or limited here. It is sufficient that the left side of the first bevel gear 5 is meshed with the third bevel gear 53, and the right side of the first bevel gear 5 is meshed with the second bevel gear 24.

[0082] When the measuring rod 32 of the present invention rotates to fit the inclined side of the cap beam 49, it can drive the rotating shaft 30 and the pointer in the protractor 33 to rotate synchronously by the same angle. The rotation angle is measured relative to the protractor 33 with the help of the pointer in the protractor 33, which is the rotation angle of the measuring rod 32. Since the measuring rod 32 and the bottom edge of the cap beam 49 are on the same horizontal line in the initial state, the complementary angle of the rotation angle of the measuring rod 32 is the final angle of the inclination angle of the side of the cap beam 49, thereby realizing the measurement of the inclination angle of the side of the cap beam 49.

[0083] It is worth noting that the cylinder 10 used in the present application is a self-locking cylinder commonly used on the market, and its output end can stay at any position and be locked; the motor 6 adopts a self-locking motor with a locked output end commonly used on the market, and its output end can be self-locked when it stops working, and will not rotate under external force, and the motor 6 is a forward and reverse motor on the existing market, that is, its output end can rotate forward or reverse as needed; the telescopic rod 39 is an existing equipment, which is composed of two rod bodies that are nested with each other, and the total length of the telescopic rod 39 can be telescoped under the action of external force. The above-mentioned existing components will not be described in detail here.

[0084] The working principle of the linear measurement device and the measurement method of the prefabricated cap beam in this embodiment is as follows:

[0085] First, the cap beam 49 is placed and positioned: the end of the lifting rope 52 is hooked on the hook 51, and the middle part of the lifting rope 52 is lifted up by means of an existing lifting device to lift the cap beam 49 upward off the ground, and the cap beam 49 is moved and placed in the stand 1 by means of the lifting device, so that the cap beam 49 is placed for measurement;

[0086] Secondly, the relative position of the measuring device and the cap beam 49 is locked and connected: the measuring device is placed along the front side of the cap beam 49 as a whole, and the measuring device is pushed from left to right until the positioning block 44 touches the inclined surface 37 and drives the inclined surface 37 and the limiting plate 36 to be forced to move upward, at which time the spring 38 is forced to stretch and the telescopic rod 39 is forced to extend. When the positioning block 44 moves to the inner cavity embedded in the bottom end of the limiting column 34, the inclined surface 37 loses its driving force, and the elastic force of the spring 38 causes the telescopic rod 39 to shorten as a whole, and causes the limiting plate 36 and the inclined surface to extend. 37 moves downward synchronously, so that the limiting piece 36 and the inclined surface 37 return to their initial positions, and the positioning block 44 is locked and limited, so as to form a stable connection relationship between the base 2 connected to the rear side of the positioning block 44 and the limiting column 34, so as to ensure the relative stability of the measuring device and the cap beam 49 in the subsequent measurement process; and because the positioning block 44 is arranged in the middle of the base 2 and the limiting column 34 is arranged in the middle of the stand 1, after the positioning block 44 is embedded in the inner cavity at the bottom end of the limiting column 34 and is stably limited, the center point of the measuring device is aligned with the center point of the cap beam 49 in a collinear manner;

[0087] Then adjust the relative position of the measuring device and the linear detection base point of the cap beam 49: in the first state, the first bevel gear 5 is meshed and connected with the third bevel gear 53, and the driving shaft 4 and the first bevel gear 5 are driven by the turned-on motor 6 to rotate synchronously, so as to cause the third bevel gear 53 to drive the first screw 11 to rotate synchronously. Since the left and right sides of the first screw 11 are provided with external threads in opposite directions and symmetrical, the rotating first screw 11 drives the two symmetrical moving seats 14 on the left and right to move synchronously in the direction away from the third bevel gear 53. At this time, the second moving block 13 at the bottom end of the moving seat 14 moves along the second limiting groove 12 at the corresponding position to limit the moving direction of the moving seat 14, and the moving seat 14 on the left moves. The second vertical plate 17, the positioning frame 18, and the second mounting frame 19 on the left are driven to move synchronously to the left, and the moving seat 14 on the right is driven to move synchronously to the right, until the tip 20 at the top of the second mounting frame 19 and the tip 20 at the top of the first mounting frame 16 correspond to the left and right intersection edges 50, respectively, thereby realizing the positioning of the relative position of the measuring device and the intersection edge 50; since the output end of the rangefinder 21 corresponds to the intersection edge 50 on the left side of the cap beam 49, and the left side wall of the first vertical plate 15 corresponds to the intersection edge 50 on the right side of the cap beam 49, the horizontal length of the bottom edge of the cap beam 49 is measured by emitting a laser to the left side wall of the first vertical plate 15 with the help of the rangefinder 21;

[0088] Measure the horizontal length and the side inclination angle of the cap beam 49: place the rangefinder 21 in the positioning frame 18, use the positioning bolt 22 to position the rangefinder 21, and make the output end of the rangefinder 21 and the tip 20 of the top of the second mounting frame 19 be located on the same vertical line. Since the left side wall of the first vertical plate 15 and the tip 20 of the top of the first mounting frame 16 are located on the same vertical line, the distance between the output end of the rangefinder 21 and the left side wall of the first vertical plate 15 is the distance between the left tip 20 and the right tip 20, which is the distance of the horizontal length of the bottom side of the cap beam 49, thereby realizing the measurement of the horizontal length of the bottom side of the cap beam 49; drive the first moving block 8 to move to the right side by the opened cylinder 10, so as to make the supporting frame 7 and the motor 6, the driving shaft 4 and the first bevel gear 5 move to the right side, so as to make the first bevel gear 5 disengage from the outer wall of the third bevel gear 53 and mesh with the outer wall of the second bevel gear 24 Then, it is the second state at this time, and the driving shaft 4 and the first bevel gear 5 are driven to rotate by the turned-on motor 6, which drives the second bevel gear 24 to rotate, so that the two movable plates 25 symmetrically threaded on the left and right sides of the second bevel gear 24 are synchronously moved outward, and the rack 27 and the movable bar 29 at the corresponding position are synchronously moved outward, so as to drive the left and right two incomplete gears 31 to rotate outward. When the incomplete gear 31 rotates, it drives the measuring rod 32, the rotating shaft 30, the tip 20 and the pointer on the front side of the protractor 33 to rotate synchronously until the measuring rod 32 fits the side of the cap beam 49. At this time, the angle of rotation of the pointer on the front side of the protractor 33 relative to the protractor 33 is the rotation angle of the measuring rod 32 relative to the side of the cap beam 49. With the help of the complementary angle property of the straight angle, 180 degrees minus the rotation angle of the measuring rod 32 is the angle of the inclination angle of the side of the cap beam 49, so that the measurement of the inclination angle of the side of the cap beam 49 is achieved.

[0089] In addition, the measurement order of the above-mentioned horizontal length and side tilt angle is not in particular order, and the first bevel gear 5 first engages with the second bevel gear 24 to rotate, and finally realizes the rotation of the two measuring rods 32, that is, first realizes the measurement of the side tilt angle of the cap beam 49, and then locks the rangefinder 21 in the positioning frame 18 through the positioning bolt 22 to perform horizontal measurement;

[0090] When measuring in the horizontal direction, the through slot 26 is provided so as not to block the laser emitted by the rangefinder 21, thereby ensuring that the laser emitted by the rangefinder 21 can accurately reach the left side wall of the first vertical plate 15, thereby achieving complete measurement of the horizontal length of the cap beam 49;

[0091] After the measuring device is used, the lifting plate 41 is lifted upward to prompt the connecting pin 40 and the limiting plate 36 to move upward synchronously, so as to prompt the inclined surface 37 to disengage from the limitation of the positioning block 44, and drive the measuring device to move to the left as a whole, so that the positioning block 44 can be disengaged from the inner cavity at the bottom end of the limiting column 34, and the measuring device can be disengaged from the limiting column 34.

[0092] The present invention can realize the linear measurement of the horizontal length and the lateral inclination angle of the cap beam 49, and the measurement of the horizontal length and the lateral inclination angle is carried out by the same device, without the need to replace the equipment, and one-time positioning can meet the detection requirements in two directions. Compared with the method of separately positioning and measuring in two directions, it has higher accuracy and avoids the positioning error generated in the process of separate positioning, and can better ensure the accuracy of the measurement result of the cap beam 49. In addition, the positioning block 44 can realize automatic positioning after being embedded from left to right to the bottom end of the limit column 34. The positioned positioning block 44 can ensure that the measuring device corresponds to the center point of the cap beam 49, that is, realize the automatic alignment and locking limit of the measuring device and the center point of the cap beam 49, and there is no need to manually perform unnecessary positioning and alignment steps between the measuring device and the cap beam 49, thereby saving measurement time and improving measurement efficiency.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A linear measuring device for a prefabricated cap beam, comprising a support unit, characterized in that: The measuring device comprises a base (2), on which two vertical plates (3) are vertically and fixedly mounted, the two vertical plates (3) being arranged symmetrically with respect to the base (2), the measuring device further comprises a measuring unit, the measuring unit comprising a first measuring mechanism for measuring a horizontal length and a second measuring mechanism for measuring an inclination angle, the first measuring mechanism and the second measuring mechanism being driven by the same driving mechanism; The driving mechanism comprises a driving shaft (4), a first bevel gear (5) is fixedly mounted on the driving shaft (4), a motor (6) is connected to the right end of the driving shaft (4), and an output end of the motor (6) is connected to the right end of the driving shaft (4), a supporting frame (7) is mounted at the bottom end of the motor (6), a first moving block (8) is fixedly mounted at the bottom end of the supporting frame (7), a first limiting groove (9) is formed on the base (2), the first moving block (8) is slidably embedded in the first limiting groove (9), a cylinder (10) is mounted on the base (2), and an output end of the cylinder (10) is connected to the right side wall of the first moving block (8); Wherein, the driving shaft (4) slides in a horizontal direction and penetrates the outer walls of the two vertical plates (3); The first measuring mechanism comprises a first screw rod (11) rotatably connected to the vertical plate (3) in a horizontal direction, and the first screw rod (11) is provided with external threads in opposite directions and symmetrically on the left and right sides; Two movable seats (14) are respectively disposed on the symmetrical threaded sleeves on the left and right sides of the first screw rod (11); Wherein, a third bevel gear (53) is fixedly mounted on the first screw rod (11), and in a first state, the third bevel gear (53) is meshingly connected with the left side wall of the first bevel gear (5); The first measuring mechanism further comprises a first vertical plate (15) fixedly and vertically mounted above the right movable seat (14), a first mounting frame (16) being fixedly mounted on the top of the first vertical plate (15), a second vertical plate (17) fixedly and vertically mounted above the left movable seat (14), a positioning frame (18) being mounted on the top of the second vertical plate (17), a second mounting frame (19) being mounted on the top of the positioning frame (18), and a tip (20) being respectively arranged on the top of the second mounting frame (19) and the first mounting frame (16); Wherein, the left side wall of the first vertical plate (15) and the tip (20) at the top end of the first mounting frame (16) are located on the same vertical line; A rangefinder (21) is placed in the positioning frame (18); Wherein, the output end of the rangefinder (21) and the tip (20) at the top end of the second mounting frame (19) are located on the same vertical line; The second measuring mechanism comprises a second screw rod (23) rotatably connected to the vertical plate (3) in a horizontal direction, and the second screw rod (23) is provided with external threads in opposite directions and symmetrically on the left and right sides, and two movable plates (25) are respectively provided with symmetrical threads on the left and right sides of the second screw rod (23), each of the movable plates (25) is provided with a through slot (26) from left to right, and each of the movable plates (25) is fixedly mounted with a rack (27), the rack (27) on the left side is slidably embedded in the second mounting frame (19) in a horizontal direction, and the rack (27) on the right side is slidably embedded in the first mounting frame (16) in a horizontal direction; A second bevel gear (24) is fixedly mounted on the second screw rod (23); in the second state, the second bevel gear (24) is meshingly connected with the right side wall of the first bevel gear (5); The second measuring mechanism further comprises a rotating shaft (30) rotatably connected to the top of the second mounting frame (19) and the top of the first mounting frame (16), respectively; an incomplete gear (31) and a measuring rod (32) are fixedly mounted on the rotating shaft (30); the incomplete gear (31) is meshingly connected with the rack (27); a protractor (33) is respectively mounted on the front side walls of the second mounting frame (19) and the first mounting frame (16); a pointer is mounted at the front end of the rotating shaft (30); the rotating shaft (30), the pointer at the front end of the rotating shaft (30), and the measuring rod (32) all rotate relative to the center of the protractor (33).

2. A linear measuring device for prefabricated cap beam according to claim 1, characterized in that: Two second limiting grooves (12) are symmetrically provided on the left and right sides of the upper surface of the base (2), a second moving block (13) is slidably embedded in each of the second limiting grooves (12), and the moving seat (14) is fixedly connected to the second moving block (13) at the corresponding position.

3. A linear measuring device for prefabricated cap beam according to claim 2, characterized in that: The top end of the positioning frame (18) is threadedly provided with a positioning bolt (22), and the bottom end of the positioning bolt (22) is threadedly downwardly penetrates the positioning frame (18) and extends into the positioning frame (18), and the bottom end of the positioning bolt (22) is in contact with the upper surface of the rangefinder (21).

4. A linear measuring device for prefabricated cap beams according to claim 3, characterized in that: A limit seat (28) is respectively installed at the bottom end of the inner wall of the second mounting frame (19) and the first mounting frame (16), and a moving bar (29) is respectively fixedly installed at the bottom end of the two racks (27), and each moving bar (29) is slidably embedded in the limit seat (28) at a corresponding position.

5. The linear measuring device for prefabricated cap beam according to claim 1, characterized in that: The support unit comprises a stand (1), a limiting column (34) is vertically mounted in the middle of the front side of the stand (1), and a self-locking mechanism connected to the base (2) is provided at the bottom end of the limiting column (34); The self-locking mechanism comprises a clearance groove (35) formed at the bottom end of the left side wall of the limiting column (34); a limiting plate (36) is provided above the clearance groove (35) and is movable in a lifting manner; the limiting plate (36) is slidably provided on the limiting column (34); an inclined surface (37) is provided on the left side of the bottom end of the limiting plate (36); and the inclined surface (37) is inclined from left to right in a downward trend; a spring (38) is installed below the limiting plate (36); and the bottom end of the spring (38) is connected to the surface of the limiting column (34); a telescopic rod (39) is provided inside the spring (38); and the two ends of the telescopic rod (39) are respectively connected to the limiting plate (36) and the limiting column (34); a positioning block (44) is fixedly installed in the middle of the front side wall of the base (2); and the positioning block (44) is embedded in the inner cavity of the bottom end of the limiting column (34); A lifting assembly is provided on the limiting plate (36), and the lifting assembly comprises a connecting pin (40) fixedly mounted on the limiting plate (36), a lifting plate (41) is fixedly mounted on the top end of the connecting pin (40), and a groove (42) is provided at the bottom end of the lifting plate (41).

6. A linear measuring device for prefabricated cap beams according to claim 5, characterized in that: The support unit further comprises a plurality of connecting columns (43) vertically mounted on the bottom end of the platform (1); a bottom frame (54) is fixedly mounted on the bottom end of the connecting column (43); a bottom plate (45) is fixedly mounted on the rear side of the bottom frame (54); a connecting plate (46) is fixedly mounted between the bottom plate (45) and the platform (1); a counterweight (48) is mounted between the connecting plate (46) and the bottom plate (45); and a counterweight (48) is placed on the bottom plate (45); A cap beam (49) is placed in the platform (1), the intersection of the bottom edge and the side edge of the cap beam (49) is an intersection edge (50), a hook (51) is arranged at the top end of the intersection edge (50), and a lifting rope (52) is hooked at the top end of the hook (51).

7. A method for measuring a linear measurement device for a prefabricated cap beam, comprising the linear measurement device for a prefabricated cap beam according to any one of claims 1 to 6, characterized in that: The steps include: S1: placing and positioning the cap beam (49) to ensure that the cap beam (49) is stably and straightly placed in the stand (1); S2: Positioning the measuring device on the front side of the cap beam (49) to ensure that the center of the measuring device is collinear with the center of the cap beam (49); S3: Adjust the two tips (20) on the left and right sides to correspond to the two intersection edges (50) respectively; S4: adjusting the measuring device to a first state to measure the horizontal length of the bottom side of the cap beam (49); The measuring device is adjusted to a second state to measure the inclination angle of the side plate of the cap beam (49); Among them, the first state and the second state are adjusted as needed, in no particular order; S5: After the measurement is completed, the measuring device is separated from the limit column (34) to end the measurement.

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