Longitudinal beam size measuring fixture

Abstract

The present invention relates to the technical field related to the measurement of vehicle frame longitudinal beams, and specifically to a longitudinal beam size measuring gauge, which comprises a front panel, a rear seat, a rotating shaft, a transmission plate and a measuring mechanism, wherein the front panel is composed of an outer ring plate, an inner ring plate and a guide beam, and the outer ring plate and the inner ring plate are arranged concentrically; the measuring mechanism is arranged to be composed of a first movable member, a second movable member, a third movable member, a fourth movable member, a fifth movable member, a sixth movable member, a seventh movable member, an eighth movable member, a main ruler and an auxiliary ruler, and the measurement is performed by the main ruler and the auxiliary ruler in the direction of the first movable member and the fifth movable member, and the shapes of holes to be measured on the longitudinal beam in other directions are judged by the second movable member, the third movable member, the fourth movable member, the sixth movable member, the seventh movable member and the eighth movable member, so as to ensure that the holes to be measured on the longitudinal beam can meet product requirements in all diameter directions, thereby effectively improving the measurement accuracy of the holes to be measured on the longitudinal beam.

Description

Technical Field

[0001] The invention relates to the technical field related to frame longitudinal beam measurement, in particular to a longitudinal beam size measurement tool. Background Art

[0002] The longitudinal beam is the most important load-bearing component on the automobile frame, so the longitudinal beam plays an important role in the automobile. The side beam frame and the center beam frame of the automobile all contain longitudinal beams. The longitudinal beam is usually stamped from low-alloy steel plates, and the cross-section shape is generally a groove type, and some are made into Z-shaped or box-shaped cross-sections;

[0003] The existing Chinese patent document with the announcement number CN208476109U discloses a tool for measuring the inner crotch size of a frame longitudinal beam, and the scheme includes a ruler body, a pressure plate and a steel ruler; the ruler body is composed of a slider, a connecting rod and a top block connected in sequence; a slide groove is arranged on the bottom surface of the slider, the width of the steel ruler matches the width of the slide groove, and the steel ruler can slide back and forth in the slide groove along the axial direction of the ruler body; the end surface of the free end of the top block is perpendicular to the axial direction of the ruler body; the pressure plate is arranged on the bottom surface of the slider, and the pressure plate covers a part of the slide groove, but it cannot measure the shaft hole on the frame, but the frame longitudinal beam and other structures of the frame need to be docked and installed, if the shaft hole size is inaccurate, it will affect the subsequent assembly process of the frame;

[0004] In the prior art, a vernier caliper is usually used for measuring the hole body. However, during actual measurement, if the vernier caliper cannot ensure that the measured straight line passes through the center of the hole body, measurement errors will occur. In addition, the vernier caliper only measures one direction. When the hole body is irregular, there will be randomness in the measurement, resulting in inaccurate measurement data. Therefore, the present invention proposes a longitudinal beam size measuring fixture to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a longitudinal beam dimension measuring jig to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a longitudinal beam size measuring gauge, the longitudinal beam size measuring gauge comprising:

[0007] A front panel, the front panel is composed of an outer ring plate, an inner ring plate and a guide beam, the outer ring plate and the inner ring plate are arranged concentrically, and the outer ring plate and the inner ring plate are connected by a guide beam, eight guide beams are arranged on the circumference, and guide grooves are provided on the guide beams;

[0008] A rear seat body, the rear seat body is composed of a main seat body and a connecting beam, the connecting beam is integrally formed with the main seat body, and the connecting beam is fixedly connected to the outer ring plate;

[0009] A rotating shaft, the rotating shaft is rotatably mounted between the front panel and the rear seat body, and a crank handle is integrally formed at the rear end of the rotating shaft;

[0010] A transmission plate, the transmission plate is fixedly mounted on the rotating shaft and is arranged between the front panel and the rear seat body, the transmission plate is provided with a transmission groove, and the transmission groove is a spiral notch structure;

[0011] The measuring mechanism is composed of a first movable member, a second movable member, a third movable member, a fourth movable member, a fifth movable member, a sixth movable member, a seventh movable member, an eighth movable member, a main scale and an auxiliary scale. The first movable member, the second movable member, the third movable member, the fourth movable member, the fifth movable member, the sixth movable member, the seventh movable member and the eighth movable member are all installed on the front panel, and the angle between adjacent movable members is forty-five degrees.

[0012] Preferably, the first movable member, the second movable member, the third movable member, the fourth movable member, the fifth movable member, the sixth movable member, the seventh movable member and the eighth movable member are all composed of a guide seat, a movable seat, a movable beam, a movable rod and a movable plate. The guide seat is movably installed in the guide groove, and a screw hole is provided on the lower surface of the guide seat. The movable rod is movably installed in the transmission groove, and a screw is integrally formed with the front side end of the movable rod. The screw is screwed into the screw hole, and the movable plate is integrally formed with the movable rod.

[0013] Preferably, the guide seat, the movable seat and the movable beam are integrally formed, and the movable beam is arranged in an L shape, and the transverse rods of the movable beams on the first movable part, the second movable part, the third movable part, the fourth movable part, the fifth movable part, the sixth movable part, the seventh movable part and the eighth movable part are arranged in a trend of increasing successively, and the difference in the length of the transverse rods of the movable beams on adjacent movable parts is one eighth of the pitch of the transmission groove, and the outer sides of the movable beams on the first movable part, the second movable part, the third movable part, the fourth movable part, the fifth movable part, the sixth movable part, the seventh movable part and the eighth movable part are always on the same circumference.

[0014] Preferably, a main scale slot is provided on the movable beam of the fifth movable member, the secondary scale is fixedly installed on the outer side of the movable beam of the fifth movable member, the main scale is fixedly installed on the inner side of the movable beam of the first movable member, and the main scale movably passes through the main scale slot, the spacing value of adjacent scales on the secondary scale is nine-tenths of the spacing value of adjacent scales on the main scale, and measuring protrusions are integrally formed on the outer side walls of the vertical rod bodies of the movable beams of the first movable member and the fifth movable member, and the spacing value of the outermost ends of the measuring protrusions is equal to the scale value on the main scale aligned with the zero scale of the secondary scale.

[0015] Preferably, a first-level spring groove is provided on the outer side wall of the vertical rod body of the movable beam on the second movable part, the third movable part, the fourth movable part, the sixth movable part, the seventh movable part and the eighth movable part, a wiring hole is provided at the bottom of the first-level spring groove, and a pressure sensor is fixedly installed at the bottom of the first-level spring groove, and a supporting spring is connected to the bottom of the first-level spring groove, the outer side end of the supporting spring is fixedly connected to a force-bearing rod, the outer side end of the force-bearing rod is hemispherical, the inner side end of the force-bearing rod is connected to a pressure plate through an elastic connecting part, and the pressure plate is aligned with the pressure sensor.

[0016] Preferably, the elastic connecting member has a regular hexagonal frame structure, and the elastic connecting member is cast from spring steel. When the support spring and the elastic connecting member are in a reset state, there is no contact between the pressure plate and the pressure sensor. When the support spring is in a reset state, the length of the force-bearing rod protruding from the outside of the primary spring groove is twice the measured protrusion thickness value. After the force-bearing rod is pushed into the primary spring groove by a distance of one-fifth of the measured protrusion thickness value, the pressure plate and the pressure sensor are in contact.

[0017] Preferably, a battery and a PLC control module are provided on the outer ring plate, and a signal light is provided on the outer side wall of the outer ring plate. The signal light and pressure sensor are both electrically connected to the PLC control module, and when the difference between the pressure value of the corresponding pressure sensor and the pressure value of the pressure sensor after the force-bearing rod pushes the measured protrusion thickness value into the primary spring groove by half a distance is greater than a set range, the corresponding signal light becomes brighter.

[0018] Preferably, a ball sleeve is sleeved on the movable rod, a primary ball groove is opened on the front surface of the movable plate, a primary ball is movably arranged in the primary ball groove, the primary ball is arranged in a circle around the circumference of the movable plate, and the primary ball is arranged in contact with the transmission plate, a secondary ball groove is opened on the rear surface of the movable seat, a secondary ball is movably arranged in the secondary ball groove, and the secondary ball is arranged in contact with the guide beam.

[0019] Preferably, a secondary spring groove is provided on the movable seat, and the secondary spring groove is connected with the screw hole through a guide rod groove, a guide rod is movably installed in the guide rod groove, and a spring connecting plate is integrally formed on the side wall of the guide rod, and a limit piece groove is provided at the end of the secondary spring groove, and a limit piece is fixedly glued in the limit piece groove, a through hole is provided on the limit piece, a reset spring is sleeved on the guide rod, and the upper end of the guide rod is arranged through the through hole on the limit piece.

[0020] Preferably, a positioning hole is provided on the end face of the screw rod, the cross-section of the guide rod is a regular octagon, the cross-sectional dimensions of the positioning hole and the guide rod groove are consistent with the cross-sectional dimensions of the guide rod, and when the reset spring is in a reset state, the guide rod is inserted into the positioning hole, and when the guide rod is pulled outward, the guide rod is completely detached from the positioning hole.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. A longitudinal beam dimension measuring jig composed of a front panel, a rear seat, a rotating shaft, a transmission plate and a measuring mechanism is provided, and the measuring mechanism is provided to be composed of a first movable member, a second movable member, a third movable member, a fourth movable member, a fifth movable member, a sixth movable member, a seventh movable member, an eighth movable member, a main ruler and an auxiliary ruler, so that the main ruler and the auxiliary ruler in the direction of the first movable member and the fifth movable member are used for measurement, and the shapes of the holes to be measured on the longitudinal beam in other directions are judged by the second movable member, the third movable member, the fourth movable member, the sixth movable member, the seventh movable member and the eighth movable member, so as to ensure that the holes to be measured on the longitudinal beam can meet the product requirements in all diameter directions, thereby effectively improving the measurement accuracy of the holes to be measured on the longitudinal beam;

[0023] 2. A secondary spring groove and a guide rod groove are provided on the movable seat, a guide rod and a return spring are arranged in the secondary spring groove, and a positioning hole is provided on the end face of the screw rod, so that the end of the guide rod is embedded in the positioning hole through the elastic support of the return spring, thereby ensuring the connection stability between the movable rod and the guide seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure enlargement in the middle;

[0026] Figure 3 It is a rear side view of the present invention;

[0027] Figure 4 A half-section view of the present invention;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0029] Figure 6 for Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0030] Figure 7 It is a schematic diagram of the structure of the front panel of the present invention;

[0031] Figure 8It is a schematic diagram of the rear seat structure of the present invention;

[0032] Fig. 9 It is a schematic diagram of the structure of the transmission plate of the present invention;

[0033] Fig.10 A half-section view of the guide seat and the movable seat of the present invention;

[0034] Fig.11 for Fig.10 A magnified schematic diagram of the structure at D in the middle;

[0035] Fig.12 for Fig.10 The enlarged schematic diagram of the structure at E in the middle;

[0036] Fig.13 It is a schematic diagram of the structure of the movable plate of the present invention;

[0037] Fig.14 It is a schematic diagram of the distribution of movable parts of the present invention.

[0038] In the figure: front panel 1, rear seat body 2, rotating shaft 3, transmission plate 4, main scale 5, auxiliary scale 6, outer ring plate 7, inner ring plate 8, guide beam 9, guide groove 10, first movable member 11, second movable member 12, third movable member 13, fourth movable member 14, fifth movable member 15, sixth movable member 16, seventh movable member 17, eighth movable member 18, main seat body 19, connecting beam 20, transmission groove 21, guide seat 22, movable seat 23, movable beam 2 4. Movable rod 25, movable plate 26, screw hole 27, screw 28, pressure sensor 29, support spring 30, force rod 31, elastic connector 32, pressure plate 33, wiring hole 34, signal light 35, ball sleeve 36, primary ball 37, positioning hole 38, guide rod groove 39, secondary spring groove 40, limiter groove 41, limiter 42, guide rod 43, spring connecting plate 44, reset spring 45, measuring protrusion 46, crank handle 50. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-14 The present invention provides the following three preferred embodiments.

[0041] Embodiment 1, longitudinal beam dimension measuring gauge, longitudinal beam dimension measuring gauge comprises front panel 1, rear seat body 2, rotating shaft 3, transmission plate 4 and measuring mechanism, front panel 1 is composed of outer ring plate 7, inner ring plate 8 and guide beam 9, outer ring plate 7 and inner ring plate 8 are arranged concentrically, and outer ring plate 7 and inner ring plate 8 are connected by guide beam 9, guide beam 9 is arranged with eight equal circumferences, and guide groove 10 is provided on each guide beam 9, rear seat body 2 is composed of main seat body 19 and connecting beam 20, connecting beam 20 is integrally formed with main seat body 19, and connecting beam 20 is fixedly connected with outer ring plate 7, rotating shaft 3 is rotatably installed between front panel 1 and rear seat body 2, and the rear side end of rotating shaft 3 is integrally formed with crank handle 50, The transmission plate 4 is fixedly mounted on the rotating shaft 3, and the transmission plate 4 is arranged between the front panel 1 and the rear seat body 2. A transmission groove 21 is opened on the transmission plate 4, and the transmission groove 21 is a spiral notch structure. The measuring mechanism is composed of a first movable member 11, a second movable member 12, a third movable member 13, a fourth movable member 14, a fifth movable member 15, a sixth movable member 16, a seventh movable member 17, an eighth movable member 18, a main scale 5 and a secondary scale 6. The first movable member 11, the second movable member 12, the third movable member 13, the fourth movable member 14, the fifth movable member 15, the sixth movable member 16, the seventh movable member 17, and the eighth movable member 18 are all installed on the front panel 1, and the angle between adjacent movable members is forty-five degrees.

[0042] The first movable member 11, the second movable member 12, the third movable member 13, the fourth movable member 14, the fifth movable member 15, the sixth movable member 16, the seventh movable member 17, and the eighth movable member 18 are all composed of a guide seat 22, a movable seat 23, a movable beam 24, a movable rod 25, and a movable plate 26. The guide seat 22 is movably installed in the guide groove 10, and a screw hole 27 is opened on the lower surface of the guide seat 22. The movable rod 25 is movably installed in the transmission groove 21, and the front side end of the movable rod 25 is integrally A screw rod 28 is formed, and the screw rod 28 is screwed and installed in the screw rod hole 27. The movable plate 26 and the movable rod 25 are integrally formed. The guide seat 22, the movable seat 23, and the movable beam 24 are integrally formed, and the movable beam 24 is set in an L shape. The transverse rod bodies of the movable beam 24 on the first movable member 11, the second movable member 12, the third movable member 13, the fourth movable member 14, the fifth movable member 15, the sixth movable member 16, the seventh movable member 17, and the eighth movable member 18 are arranged in a sequentially increasing trend, and the movable beam 24 is arranged in an L shape. The difference in the transverse rod length of the movable beam 24 on the adjacent movable parts is one eighth of the pitch of the transmission groove 21, and the outer sides of the movable beams 24 on the first movable part 11, the second movable part 12, the third movable part 13, the fourth movable part 14, the fifth movable part 15, the sixth movable part 16, the seventh movable part 17, and the eighth movable part 18 are always on the same circumference, and a main ruler groove is provided on the movable beam 24 of the fifth movable part 15, and the auxiliary ruler 6 is fixedly installed on the outer side of the movable beam 24 on the fifth movable part 15, and the main ruler 5 is fixedly installed on the outer side of the movable beam 24 on the fifth movable part 15. It is fixedly installed on the inner side of the movable beam 24 on the first movable member 11, and the main scale 5 is movable through the main scale slot. The spacing value of adjacent scales on the auxiliary scale 6 is nine-tenths of the spacing value of adjacent scales on the main scale 5. The outer side walls of the vertical rod bodies of the movable beams 24 on the first movable member 11 and the fifth movable member 15 are integrally formed with measuring protrusions 46, and the spacing value of the outermost ends of the measuring protrusions 46 is equal to the scale value on the main scale 5 that is aligned with the zero scale of the auxiliary scale 6. The cooperation of the main scale 5 and the auxiliary scale 6 can improve the accuracy of the measurement results.

[0043] A primary spring groove is provided on the outer side wall of the vertical rod body of the movable beam 24 of the second movable member 12, the third movable member 13, the fourth movable member 14, the sixth movable member 16, the seventh movable member 17 and the eighth movable member 18, a wiring hole 34 is provided at the bottom of the primary spring groove, a pressure sensor 29 is fixedly installed at the bottom of the primary spring groove, and a support spring 30 is connected to the bottom of the primary spring groove, a force-bearing rod 31 is fixedly connected to the outer side end of the support spring 30, the outer side end of the force-bearing rod 31 is hemispherical, and the inner side end of the force-bearing rod 31 is connected to the pressure plate 3 through an elastic connecting member 32. 3. The pressure plate 33 is aligned with the pressure sensor 29, and the elastic connector 32 is a regular hexagonal frame structure, and the elastic connector 32 is cast from spring steel. When the support spring 30 and the elastic connector 32 are in the reset state, the pressure plate 33 and the pressure sensor 29 are not in contact. When the support spring 30 is in the reset state, the length of the force rod 31 protruding from the outside of the primary spring groove is twice the thickness of the measuring protrusion 46. After the force rod 31 pushes the measuring protrusion 46 into the primary spring groove by a distance of one-fifth of the thickness, the pressure plate 33 and the pressure sensor 29 are in contact.

[0044] The outer ring plate 7 is provided with a battery and a PLC control module, and a signal light 35 is provided on the outer side wall of the outer ring plate 7. The signal light 35 and the pressure sensor 29 are both connected with the PLC control module by electrical signals, and when the difference between the pressure value of the corresponding pressure sensor 29 and the pressure value of the pressure sensor 29 after the force-bearing rod 31 pushes the measuring protrusion 46 into the primary spring groove by half the thickness value is greater than the set range, the corresponding signal light 35 lights up, and a longitudinal beam size measuring fixture composed of a front panel 1, a rear seat body 2, a rotating shaft 3, a transmission plate 4 and a measuring mechanism is provided, and the measuring mechanism is provided as a first movable member 11, a second movable member 12, The third movable member 13, the fourth movable member 14, the fifth movable member 15, the sixth movable member 16, the seventh movable member 17, the eighth movable member 18, the main scale 5 and the auxiliary scale 6 are combined to measure the main scale 5 and the auxiliary scale 6 in the direction of the first movable member 11 and the fifth movable member 15, and the shapes of the holes to be measured on the longitudinal beam in other directions are judged by the second movable member 12, the third movable member 13, the fourth movable member 14, the sixth movable member 16, the seventh movable member 17 and the eighth movable member 18, so as to ensure that the holes to be measured on the longitudinal beam can meet the product requirements in all diameter directions, thereby effectively improving the measurement accuracy of the holes to be measured on the longitudinal beam.

[0045] Embodiment 2, on the basis of embodiment 1, a ball sleeve 36 is sleeved on the movable rod 25, a primary ball groove is provided on the front surface of the movable plate 26, a primary ball 37 is movably arranged in the primary ball groove, the primary ball 37 is arranged in a circle around the circumference of the movable plate 26, and the primary ball 37 is arranged in contact with the transmission plate 4, a secondary ball groove is provided on the rear surface of the movable seat 23, a secondary ball is movably arranged in the secondary ball groove, the secondary ball is arranged in contact with the guide beam 9, and the flexibility of the structural adjustment process is ensured by the arrangement of the ball sleeve 36, the primary ball 37, and the secondary ball.

[0046] Embodiment 3, on the basis of embodiment 2, a secondary spring groove 40 is provided on the movable seat 23, and the secondary spring groove 40 is connected with the screw hole 27 through the guide rod groove 39, a guide rod 43 is movably installed in the guide rod groove 39, and a spring connecting plate 44 is integrally formed on the side wall of the guide rod 43, and a limit member groove 41 is provided at the end of the secondary spring groove 40, and a limit member 42 is fixedly glued in the limit member groove 41, and a through hole is provided on the limit member 42, and a reset spring 45 is sleeved on the guide rod 43, and the upper end of the guide rod 43 is arranged through the through hole on the limit member 42, and a positioning hole 38 is provided on the end face of the screw 28, and the cross section of the guide rod 43 is a regular octagon. The cross-sectional dimensions of the positioning hole 38 and the guide rod groove 39 are consistent with the cross-sectional dimensions of the guide rod 43. When the reset spring 45 is in the reset state, the guide rod 43 is inserted into the positioning hole 38. When the guide rod 43 is pulled outward, the guide rod 43 is completely separated from the positioning hole 38. By opening a secondary spring groove 40 and a guide rod groove 39 on the movable seat 23, and arranging the guide rod 43 and the reset spring 45 in the secondary spring groove 40, and opening a positioning hole 38 on the end face of the screw 28, the end of the guide rod 43 is embedded in the positioning hole 38 through the elastic support of the reset spring 45, thereby ensuring the connection stability between the movable rod 25 and the guide seat 22.

[0047] In actual use, the staff extends the front halves of the first movable member 11, the second movable member 12, the third movable member 13, the fourth movable member 14, the fifth movable member 15, the sixth movable member 16, the seventh movable member 17, and the eighth movable member 18 into the hole to be measured on the longitudinal beam, and then rotates the crank handle 50 to allow the measuring protrusions 46 on the first movable member 11 and the fifth movable member 15 to fit tightly with the hole to be measured, and then reads the diameter of the hole to be measured through the main scale 5 and the auxiliary scale 6, and predicts and judges the length values ​​of other diameter directions of the hole to be measured through the signal light 35 to determine whether the hole to be measured is qualified.

[0048] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A longitudinal beam size measuring fixture, characterized by: The longitudinal beam size measuring fixture comprises: A front panel (1), the front panel (1) being composed of an outer ring plate (7), an inner ring plate (8) and a guide beam (9), the outer ring plate (7) and the inner ring plate (8) being arranged concentrically, and the outer ring plate (7) and the inner ring plate (8) being connected by the guide beam (9), eight guide beams (9) being arranged on an equal circumference, and guide grooves (10) being provided on the guide beams (9); A rear seat body (2), the rear seat body (2) being composed of a main seat body (19) and a connecting beam (20), the connecting beam (20) being integrally formed with the main seat body (19), and the connecting beam (20) being fixedly connected to the outer ring plate (7); A rotating shaft (3), the rotating shaft (3) being rotatably mounted between the front panel (1) and the rear seat body (2), and a crank handle (50) being integrally formed at the rear end of the rotating shaft (3); a transmission plate (4), the transmission plate (4) being fixedly mounted on the rotating shaft (3), and the transmission plate (4) being arranged between the front panel (1) and the rear seat body (2), the transmission plate (4) being provided with a transmission groove (21), and the transmission groove (21) being a spiral groove structure; A measuring mechanism, the measuring mechanism comprising a first movable member (11), a second movable member (12), a third movable member (13), a fourth movable member (14), a fifth movable member (15), a sixth movable member (16), a seventh movable member (17), an eighth movable member (18), a main scale (5) and an auxiliary scale (6), the first movable member (11), the second movable member (12), the third movable member (13), the fourth movable member (14), the fifth movable member (15), the sixth movable member (16), the seventh movable member (17) and the eighth movable member (18) being all mounted on the front panel (1), and an angle between adjacent movable members is forty-five degrees; The first movable member (11), the second movable member (12), the third movable member (13), the fourth movable member (14), the fifth movable member (15), the sixth movable member (16), the seventh movable member (17) and the eighth movable member (18) are all composed of a guide seat (22), a movable seat (23), a movable beam (24), a movable rod (25) and a movable plate (26); the guide seat (22) is movably mounted in the guide groove (10), and a screw hole (27) is provided on the lower surface of the guide seat (22); the movable rod (25) is movably mounted in the transmission groove (21), and a screw (28) is integrally formed at the front side end of the movable rod (25); the screw (28) is screwed into the screw hole (27); and the movable plate (26) and the movable rod (25) are integrally formed; The guide seat (22), the movable seat (23) and the movable beam (24) are integrally formed, and the movable beam (24) is arranged in an L shape, and the transverse rod bodies of the movable beams (24) on the first movable member (11), the second movable member (12), the third movable member (13), the fourth movable member (14), the fifth movable member (15), the sixth movable member (16), the seventh movable member (17) and the eighth movable member (18) are arranged in a trend of increasing in sequence, and the difference in the transverse rod body lengths of the movable beams (24) on adjacent movable members is one eighth of the pitch of the transmission groove (21), and the outer sides of the movable beams (24) on the first movable member (11), the second movable member (12), the third movable member (13), the fourth movable member (14), the fifth movable member (15), the sixth movable member (16), the seventh movable member (17) and the eighth movable member (18) are always on the same circumference; A main scale slot is provided on the movable beam (24) of the fifth movable member (15); the secondary scale (6) is fixedly mounted on the outer side of the movable beam (24) on the fifth movable member (15); the main scale (5) is fixedly mounted on the inner side of the movable beam (24) on the first movable member (11); and the main scale (5) is movable through the main scale slot; the spacing value of adjacent scales on the secondary scale (6) is nine tenths of the spacing value of adjacent scales on the main scale (5); and measuring protrusions (46) are integrally formed on the outer side walls of the vertical rod bodies of the movable beams (24) on the first movable member (11) and the fifth movable member (15); and the spacing value of the outermost ends of the measuring protrusions (46) is equal to the scale value on the main scale (5) aligned with the zero scale of the secondary scale (6).

2. The longitudinal beam dimension measuring jig according to claim 1, characterized in that: The outer side walls of the vertical rod bodies of the movable beams (24) on the second movable member (12), the third movable member (13), the fourth movable member (14), the sixth movable member (16), the seventh movable member (17) and the eighth movable member (18) are all provided with primary spring grooves, the bottom of the primary spring grooves are provided with wiring holes (34), the bottom of the primary spring grooves are fixedly mounted with pressure sensors (29), the bottom of the primary spring grooves are connected with support springs (30), the outer side ends of the support springs (30) are fixedly connected with force-bearing rods (31), the outer side ends of the force-bearing rods (31) are hemispherical, the inner side ends of the force-bearing rods (31) are connected with pressure plates (33) via elastic connectors (32), and the pressure plates (33) are aligned with the pressure sensors (29).

3. The longitudinal beam dimension measuring jig according to claim 2, characterized in that: The elastic connecting member (32) is in a regular hexagonal frame structure, and the elastic connecting member (32) is cast from spring steel. When the support spring (30) and the elastic connecting member (32) are both in a reset state, the pressure plate (33) and the pressure sensor (29) are not in contact with each other. When the support spring (30) is in a reset state, the length of the force-bearing rod (31) protruding outside the primary spring groove is twice the thickness of the measuring protrusion (46). After the force-bearing rod (31) pushes the measuring protrusion (46) into the primary spring groove by a distance one-fifth of the thickness, the pressure plate (33) and the pressure sensor (29) are in contact with each other.

4. The longitudinal beam dimension measuring jig according to claim 3 is characterized in that: A battery and a PLC control module are arranged on the outer ring plate (7), and a signal light (35) is arranged on the outer side wall of the outer ring plate (7). The signal light (35) and the pressure sensor (29) are both connected to the PLC control module by electrical signals, and when the difference between the pressure value received by the corresponding pressure sensor (29) and the pressure value received by the pressure sensor (29) after the force-bearing rod (31) pushes the measuring protrusion (46) into the primary spring groove by half the thickness value is greater than a set range, the corresponding signal light (35) lights up.

5. The longitudinal beam dimension measuring jig according to claim 4, characterized in that: A ball sleeve (36) is sleeved on the movable rod (25); a primary ball groove is formed on the front surface of the movable plate (26); a primary ball (37) is movably arranged in the primary ball groove; the primary ball (37) is arranged in a circle around the circumference of the movable plate (26); the primary ball (37) is arranged in contact with the transmission plate (4); a secondary ball groove is formed on the rear surface of the movable seat (23); a secondary ball is movably arranged in the secondary ball groove; the secondary ball is arranged in contact with the guide beam (9).

6. The longitudinal beam dimension measuring jig according to claim 5, characterized in that: The movable seat (23) is provided with a secondary spring groove (40), the secondary spring groove (40) being connected to the screw hole (27) through a guide rod groove (39), a guide rod (43) being movably mounted in the guide rod groove (39), a spring connecting plate (44) being integrally formed on a side wall of the guide rod (43), a limit member groove (41) being provided at an end of the secondary spring groove (40), a limit member (42) being fixedly glued in the limit member groove (41), a through hole being provided in the limit member (42), a return spring (45) being sleeved on the guide rod (43), and an upper end of the guide rod (43) being arranged to pass through the through hole in the limit member (42).

7. The longitudinal beam dimension measuring jig according to claim 6, characterized in that: A positioning hole (38) is formed on the end surface of the screw rod (28); the cross section of the guide rod (43) is a regular octagon; the cross-sectional dimensions of the positioning hole (38) and the guide rod groove (39) are consistent with the cross-sectional dimensions of the guide rod (43); when the reset spring (45) is in a reset state, the guide rod (43) is inserted into the positioning hole (38); when the guide rod (43) is pulled outward, the guide rod (43) is completely separated from the positioning hole (38).

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