Automobile rear seat four-part backrest back panel welding surface inspection fixture

Abstract

In order to solve the problems of the existing detection method of the welding surface of the four-part backrest of the rear seat of the automobile, such as the difficulty in ensuring the accuracy and reliability of the detection results, the time-consuming and labor-intensive process, and the low efficiency, the utility model proposes a welding surface inspection tool for the four-part backrest of the rear seat of the automobile, including a base plate, a side enclosure, a positioning column, a reference column, a pressure head, a reference plate and a go / no-go gauge; the base plate is a rectangular plate; the side enclosure is fixed on the surface of the base plate; the positioning column is fixed on the surface of the base plate inside the side enclosure; the positioning shaft is arranged on the surface of the base I; the reference column is fixed on the surface of the base plate inside the side enclosure at intervals; the pressure head is fixed on the surface of the base plate outside the side enclosure at intervals; the clamping mechanism is fixed on the front end of the rocker I; there are six reference plates; and the gauge plate is fixed on the front end of the rocker II. The beneficial technical effect of the utility model is that it can detect whether all convex step surfaces are on the same plane, and the method is simple and the result is reliable.

Description

Technical Field

[0001] The utility model relates to a welding surface detection technology for a four-part backrest backboard of a rear-row seat of an automobile, in particular to a welding surface detection tool for a four-part backrest backboard of a rear-row seat of an automobile. Background Art

[0002] The back panel of the four-part backrest of the rear seat of the car is a stamped sheet metal part, which is used on the backrest of the rear seat of the car. Its function is to improve the strength of the rear seat, prevent the rear seat from being torn or deformed by the impact of luggage, causing injuries to the rear passengers, and at the same time, prevent the rear seat from being pierced by sharp luggage. The back panel of the four-part backrest of the rear seat of the car is made of metal sheet by stamping technology. It needs to go through stamping processes such as drawing, punching and trimming, flanging, pre-rolling and curling before it can be completed. The contour shape of the stamped back panel of the four-part backrest of the rear seat of the car is a rectangle, with arc-shaped flangings on all sides, a number of inclined long strip steps in the middle, and elliptical through holes on the surface of the steps. Between the arc-shaped flangings on all sides and the long strip step in the middle, there are a number of rectangular or L-shaped convex steps, and the surface of the convex steps is a plane (see attached Figure 1 , in the figure, a is a convex step). In specific use, the four-part backrest backboard is welded to the seat frame through the surface of the convex step, and the surface of each convex step is a welding point, thereby forming a strong support and protection. In order to ensure the quality of welding, it is required that the surfaces of all convex steps are on the same plane, so that it can be ensured that the surface of each convex step is firmly welded to the seat frame (for this reason, the surface formed by all convex steps is called "welding surface"). Since the four-part backrest backboard is made by a stamping process and is a thin metal plate, it is inevitable that curling or warping will occur during the production process; therefore, after the stamping is completed, it is necessary to check whether the surfaces of all convex steps are on the same plane. The prior art method for detecting the welding surface of the four-part backrest backboard of the rear seat of the automobile uses a ruler to detect whether the surfaces of all convex steps are on the same plane. The ruler is a long strip of rigid ruler with a rectangular cross-section. During the test, place the quarter backrest on a flat surface, place a ruler on the surface of the same row of convex steps, and use a feeler gauge to measure the gap between the convex step surface and the bottom of the ruler to confirm whether the gap between each convex step surface and the bottom of the ruler is basically consistent and the error is within the design range (see Appendix). Figure 2 , in the figure, a is the convex step, b is the ruler). Obviously, if the backboard of the four-part backrest is curled or warped, it may cause the convex steps themselves to be not on the same plane when it is placed on a plane. In addition, the ruler has no constraints, so it is difficult to ensure the accuracy and reliability of the measurement results. In addition, this detection method also has the problems of time-consuming, labor-intensive and low efficiency.

[0003] Obviously, the existing method for detecting the welded surface of the four-part backrest backboard of the rear seat of an automobile has the problems of difficulty in ensuring the accuracy and reliability of the detection results, time-consuming and labor-intensive, and low efficiency. Summary of the invention

[0004] In order to solve the problems of the existing automobile rear seat four-part backrest backboard welding surface detection method, such as difficulty in ensuring accurate and reliable detection results, time-consuming and labor-intensive, and low efficiency, the utility model proposes a automobile rear seat four-part backrest backboard welding surface inspection tool.

[0005] The utility model discloses a welding surface inspection tool for a four-part backrest of a rear seat of an automobile, comprising a base plate, a side enclosure, a positioning column, a reference column, a pressure head, a reference plate and a go / no-go gauge; the base plate is a rectangular plate; the side enclosure is a rectangular frame fixed on the surface of the base plate, and the shape and size of the inner side of the side enclosure frame are matched with the outer shape of a qualified four-part backrest; the positioning columns are two, comprising a base I and a positioning shaft; the base I is a rectangular cylinder fixed on the surface of the base plate on the inner side of the side enclosure; the positioning shaft is arranged on the surface of the base I; the reference columns are six, comprising a base II and a reference step; the base II is a rectangular cylinder fixed at intervals on the surface of the base plate on the inner side of the side enclosure; the reference step is a convex shape fixed on the upper surface of the base II; the pressure heads are six, comprising a base Base III, articulated seat I, rocker I, locking column I, locking pin I, wrench I and clamping mechanism; the base III is a rectangular cylinder, fixed at intervals on the surface of the substrate outside the side enclosure; the articulated seat I is fixed to the surface of the base III, a hinge shaft is provided at the rear end of the articulated seat I, and a locking through hole is provided at the front end; the rocker I is a long strip rod, the rear end of which is hinged to the rear end of the articulated seat I; the locking column I is a circular cylinder, inserted into the locking through hole at the front end of the articulated seat, and a spiral groove is provided on the outer circle of the locking column I; the locking pin I is fixed to the top of the spiral groove of the locking column I through the through hole above the articulated seat I; the wrench I is fixed to the outer end of the locking column I; the clamping mechanism is fixed to the front end of the rocker I; there are six reference plates, including, base IV , articulated seat II, rocker II, locking column II, locking pin II, wrench II and gauge plate; the shape and structure of the base IV, articulated seat II, rocker II, locking column II, locking pin II and wrench II are the same as the corresponding parts of the pressure head, and the assembly structure is also the same; the gauge plate is a T-shaped or L-shaped rigid metal strip with a rectangular cross-section, and is fixed to the front end of the rocker II, and a number of detection planes are arranged on the lower side of the metal strip; the go / no-go gauge includes a handle, a passing end and a blocking end; the handle is a polygonal cylinder, and a passing end and a blocking end are arranged at both ends respectively; the passing end is a bent round rod, and its diameter is smaller than the detection gap, which is the minimum size required by the design; the blocking end is a bent round rod, and its diameter is larger than the detection gap, which is the maximum size required by the design; wherein, the The fixing position and height of the reference column shall be based on the condition that after the qualified four-part backrest backboard is placed in the side enclosure frame with the welding surface facing upwards, the inner surfaces of the convex steps at the four corners and the middle of the long side of the four-part backrest backboard are in close contact with the corresponding upper surfaces of the reference steps of the reference column, and the upper surfaces of all the reference steps are in the same plane; the fixing position and height of the positioning column shall be based on the condition that the inner surfaces of the convex steps at the four corners and the middle of the long side of the qualified four-part backrest backboard are in close contact with the corresponding upper surfaces of the reference steps of the reference column, and the two through holes at the diagonal positions of the four-part backrest backboard are respectively inserted on the positioning shaft; the fixing position and height of the pressure head shall be based on the condition that after the pressing mechanism is in the pressing state, the pressing surfaces of each pressing mechanism respectively coincide with and are in close contact with the corresponding upper surfaces of the reference steps;The fixed position and height of the reference plate is such that the qualified four-part backrest back plate is placed on the positioning column and the reference column with the welding surface facing upward and the clamping mechanism presses it on the reference column. After the reference plate rocker II is rotated to a position perpendicular to the base IV and locked, a set gap is left between the detection plane of the lower side of the front end of the rocker II and the convex step surface of the corresponding four-part backrest back plate, and the detection planes of the lower side of all the gauge plates are on the same plane, and the plane is parallel to the plane formed by the upper surfaces of all the reference steps; the set gap between the detection plane and the convex step surface of the corresponding four-part backrest back plate is the detection gap. ;

[0006] Furthermore, the clamping mechanism includes a hollow screw, a fastening nut, a sliding rod, a wrench III, a connecting rod, a screw, a cylindrical pressure head, a spring and an adjusting nut; a hinged cap is extended at the upper end of the hollow screw, and the threaded section is inserted into the through hole of the front end of the rocker I; the fastening nut is screwed onto the hollow screw, thereby fixing the hollow screw to the front end of the rocker I; the sliding rod is sleeved in the through hole of the hollow screw; the front end of the wrench III is provided with a U-shaped opening with two parallel sides bent into an L shape, and The front end of the short side of the L-shape bend narrows inward; and hinge holes are provided at the front and rear ends of the short side of the L-shape bend; the upper end of the sliding rod is hinged to the front end of the short side of the L-shape bend; the connecting rod is a parallel structure, one end of which is hinged to the rear end of the short side of the L-shape bend, and the other end is hinged to the upper end of the hollow screw; the screw is screwed on the lower end of the sliding rod; the spring is sleeved between the adjusting nut of the screw and the cylindrical pressure head; the spring is sleeved on the screw; the cylindrical pressure head is installed at the lower end of the screw.

[0007] Furthermore, the rod of the wrench III is covered with a plastic sleeve or a rubber sleeve.

[0008] The beneficial technical effect of the utility model of the welding surface inspection fixture of the four-part backrest backboard of the rear seat of the automobile is that it can detect whether all the convex step surfaces are on the same plane while ensuring that the four-part backrest backboard is flat, and the method is simple and the result is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a three-dimensional schematic diagram of the four-part backrest of the rear seat of the car;

[0010] Attached Figure 2 It is a three-dimensional schematic diagram of a prior art method for detecting the welding surface of a four-part backrest backboard of a rear seat of an automobile;

[0011] Attached Figure 3 It is a three-dimensional schematic diagram of the welding surface inspection fixture of the four-part backrest backboard of the rear seat of the automobile of the utility model;

[0012] Attached Figure 4 It is a three-dimensional schematic diagram of the positioning column of the utility model;

[0013] Attached Figure 5 It is a three-dimensional schematic diagram of the reference column of the utility model;

[0014] Attached Figure 6 It is a three-dimensional schematic diagram of the pressure head of the utility model;

[0015] Attached Figure 7 It is an exploded three-dimensional schematic diagram of the pressure head part of the utility model;

[0016] Attached Figure 8 It is an exploded three-dimensional schematic diagram of the clamping mechanism of the utility model;

[0017] Attached Fig. 9 It is a three-dimensional schematic diagram of the reference plate of the utility model;

[0018] Attached Fig.10 It is a three-dimensional schematic diagram of the go / no-go gauge of the utility model;

[0019] Attached Fig.11 It is a three-dimensional schematic diagram of the detection state of the welding surface inspection fixture of the four-part backrest backboard of the rear seat of the automobile of the utility model.

[0020] In the figure, 1 is a base plate; 2 is a side enclosure; 3 is a positioning column, 3-1 is a base Ⅰ, 3-2 is a positioning shaft; 4 is a reference column, 4-1 is a base Ⅱ, 4-2 is a reference step; 5 is a pressure head, 5-1 is a base Ⅲ, 5-2 is an articulated seat Ⅰ, 5-3 is a rocker Ⅰ, 5-4 is a locking column Ⅰ, 5-5 is a locking pin Ⅰ, 5-6 is a wrench Ⅰ, 5-7 is a clamping mechanism; 5-7-1 is a hollow screw, 5-7-2 is a fastening nut, 5-7-3 is a slide rod, 5-7- 4 is wrench III, 5-7-5 is connecting rod 5-7-6 is screw rod, 5-7-7 is cylindrical pressure head, 5-7-8 is spring 5-7-8, 5-7-9 is adjusting nut, 5-7-10 is plastic sleeve or rubber sleeve; 6 is reference plate, 6-1 is base IV, 6-2 is hinged seat II, 6-3 is rocker II, 6-4 is locking column II, 6-5 is wrench II, 6-6 is gauge plate; 7 is go / no-go gauge, 7-1 is handle, 7-2 is passing end, 7-3 is blocking end.

[0021] The following is a further description of the welding surface inspection fixture for the back plate of the four-part backrest of the rear seat of the automobile of the utility model in combination with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0022] By the attached Figure 3 , 4, 5, 6, 7, 9, 10, it can be known that the utility model automobile rear seat four-part backrest backboard welding surface inspection fixture includes a base plate 1, a side enclosure 2, a positioning column 3, a reference column 4, a pressure head 5, a reference plate 6 and a go / no-go gauge 7; the base plate is a rectangular plate; the side enclosure is a rectangular frame fixed to the surface of the base plate, and the shape and size of the inner side of the side enclosure frame match the outer shape of a qualified four-part backrest backboard; the positioning columns are two, including a base I 3-1 and a positioning shaft 3-2; the base I is a rectangular cylinder fixed to the surface of the base plate on the inner side of the side enclosure; the positioning shaft is arranged on the surface of the base I; the reference columns are six, including a base II 4-1 and a reference step 4-2; the base II is a rectangular cylinder , fixed at intervals on the surface of the substrate on the inner side of the side enclosure; the reference step is convex and fixed on the upper surface of the base II; there are six pressure heads, including a base III 5-1, an articulated seat I 5-2, a rocker I 5-3, a locking column I 5-4, a locking pin I 5-5, a wrench I 5-6 and a clamping mechanism 5-7; the base III is a rectangular cylinder, fixed at intervals on the surface of the substrate on the outer side of the side enclosure; the articulated seat I is fixed on the surface of the base III, a hinge shaft is provided at the rear end of the articulated seat I, and a locking through hole is provided at the front end; the rocker I is a long strip rod, the rear end of which is hinged to the rear end of the articulated seat I; the locking column I is a circular cylinder, inserted into the locking through hole at the front end of the articulated seat, and a spiral is provided on the outer circle of the locking column I shaped groove; the locking pin Ⅰ is fixed to the upper part of the spiral groove of the locking column Ⅰ through the through hole above the hinge seat Ⅰ; the wrench Ⅰ is fixed to the outer end of the locking column Ⅰ; the clamping mechanism is fixed to the front end of the rocker Ⅰ; the reference plates are six, including the base Ⅳ6-1, the hinge seat Ⅱ6-2, the rocker Ⅱ6-3, the locking column Ⅱ6-4, the locking pin Ⅱ, the wrench Ⅱ6-5 and the gauge plate 6-6; the shape and structure of the base Ⅳ, the hinge seat Ⅱ, the rocker Ⅱ, the locking column Ⅱ, the locking pin Ⅱ and the wrench Ⅱ are the same as the corresponding parts of the pressure head, and the assembly structure is also the same; the gauge plate is a T-shaped or L-shaped rigid metal strip with a rectangular cross-section, and is fixed to the front end of the rocker Ⅱ, on the lower side of the metal strip Several detection planes are provided; the go / no-go gauge includes a handle 7-1, a passing end 7-2 and a blocking end 7-3; the handle is a polygonal cylinder, with a passing end and a blocking end respectively provided at both ends; the passing end is a bent round rod, with a diameter smaller than the detection gap, which is the minimum size required by the design; the blocking end is a bent round rod, with a diameter larger than the detection gap, which is the maximum size required by the design; wherein, the fixing position and height of the reference column are such that after the qualified quarter-backrest back plate is placed in the side enclosure frame with the welding surface facing upward, the inner surfaces of the convex steps at the four corners and the middle of the long side of the quarter-backrest back plate are in close contact with the corresponding upper surfaces of the reference column reference steps, and the upper surfaces of all reference steps are on the same plane;The fixed position and height of the positioning column shall be based on the condition that the inner surfaces of the convex steps at the four corners and the middle of the long side of the qualified quarter-backrest backboard are in close contact with the upper surfaces of the corresponding reference steps of the reference column, and the two through holes at the diagonal positions of the quarter-backrest backboard are respectively inserted on the positioning shaft; the fixed position and height of the pressure head shall be based on the condition that after the clamping mechanism is in the clamping state, the clamping surfaces of each clamping mechanism respectively coincide with and are in close contact with the upper surfaces of the corresponding reference steps; the fixed position and height of the reference plate shall be based on the condition that the welding surface of the qualified quarter-backrest backboard faces After it is placed on the positioning column and the reference column and the clamping mechanism presses it on the reference column, the reference plate rocker II rotates to a position perpendicular to the base IV and is locked, a set gap is left between the detection plane of the lower side of the gauge plate at the front end of the rocker II and the convex step surface of the corresponding four-part backrest backboard, and the detection planes of the lower sides of all gauge plates are on the same plane, and the plane is parallel to the plane formed by the upper surfaces of all reference steps; the set gap between the detection plane and the convex step surface of the corresponding four-part backrest backboard is the detection gap. During the specific inspection, the four-part backrest to be inspected is placed with the welding surface facing upwards on the positioning column and the reference column. At this time, the two through holes at the diagonal positions of the four-part backrest to be inspected should be respectively inserted on the positioning shafts, and the inner surfaces of the convex steps at the four corners and the middle of the long sides of the four-part backrest to be inspected should be in close contact with the upper surfaces of the corresponding reference steps; respectively rotate each pressure head rocker Ⅰ to the inner side of the side enclosure and perpendicular to their respective bases Ⅲ, pull the wrench Ⅰ to put the locking column Ⅰ in the locking position; set each clamping mechanism to the clamping position; at this time, the four-part backrest to be inspected is fixed flatly on the reference column. Rotate the rocker II of each reference plate to a position perpendicular to the base IV and lock it, and place the gauge plate at the front end of the rocker II in the set position. At this time, the gap between the detection plane on the lower side of the gauge plate and the corresponding convex step surface of the four-part backrest is the detection gap; insert the through end and the blocking end of the through-no-go gauge into the detection gap of each convex step surface respectively. If the through end can be inserted and the blocking end cannot be inserted, it is considered that the welding surfaces of the four-part backrest backplate to be tested are on the same plane and are considered qualified; if the through end cannot be inserted or the blocking end can be inserted into the detection gap of the individual convex step surface, it is considered that the welding surfaces of the four-part backrest backplate to be tested are not on the same plane and are considered unqualified (see attachment; Fig.11 ). It can be seen that the utility model of the welding surface inspection fixture of the four-part backrest backboard of the rear seat of the automobile can detect whether all the convex step surfaces are on the same plane while ensuring that the four-part backrest backboard is flat, and the method is simple and the result is reliable.

[0023] By the attached Figure 8It can be seen that, as one of the optional solutions, the clamping mechanism includes a hollow screw 5-7-1, a fastening nut 5-7-2, a sliding rod 5-7-3, a wrench III 5-7-4, a connecting rod 5-7-5, a screw 5-7-6, a cylindrical pressure head 5-7-7, a spring 5-7-8 and an adjusting nut 5-7-9; the upper end of the hollow screw is extended with a hinged cap, and the threaded section is inserted into the through hole of the front end of the rocker I; the fastening nut is screwed onto the hollow screw, thereby fixing the hollow screw to the front end of the rocker I; the sliding rod is sleeved in the through hole of the hollow screw; the wrench The front end of hand III is provided with a U-shaped opening with two parallel sides bent into an L shape, and the front end of the short side of the L-shaped bend is narrowed inward; and hinge holes are provided at the front and rear ends of the short side of the L-shaped bend; the upper end of the sliding rod is hinged to the front end of the short side of the L-shaped bend; the connecting rod is a parallel structure, one end is hinged to the rear end of the short side of the L-shaped bend, and the other end is hinged to the upper end of the hollow screw; the screw is screwed on the lower end of the sliding rod; the adjusting nut is screwed on the screw; the spring is sleeved between the adjusting nut of the screw and the cylindrical pressure head; the cylindrical pressure head is installed at the lower end of the screw. The connecting rod clamping structure is not only simple in structure and easy to operate, but also low in cost. The spring is set between the adjusting nut and the cylindrical pressure head to avoid "hard contact" between the cylindrical pressure head and the four-part backrest backboard to be tested when the four-part backrest backboard is curled or warped, which may cause damage to the inspection fixture; at the same time, it is ensured that the pressing force of all cylindrical pressure heads on the four-part backrest backboard to be tested is basically the same. The setting of the adjusting nut can adjust the pressing force and pressing stroke of the cylindrical pressure head to ensure the inspection quality.

[0024] As one of the preferred embodiments, the rod of the wrench III is covered with a plastic sleeve or a rubber sleeve (see attached Figure 8 ). Thus, the operating feel of each wrench is improved.

[0025] Obviously, the beneficial technical effect of the utility model of the welding surface inspection fixture of the four-part backrest backboard of the rear seat of the automobile is that it can detect whether all the convex step surfaces are on the same plane while ensuring that the four-part backrest backboard is flat, and the method is simple and the result is reliable.

Claims

1. A welding surface inspection fixture for a four-part backrest plate of a rear seat of an automobile, characterized in that: The inspection tool comprises a base plate, a side enclosure, a positioning column, a reference column, a pressure head, a reference plate and a go / no-go gauge; the base plate is a rectangular plate; the side enclosure is a rectangular frame fixed on the surface of the base plate, and the shape and size of the inner side of the side enclosure frame match the outer shape of the qualified quarter-backrest backboard; there are two positioning columns, including a base I and a positioning shaft; the base I is a rectangular column fixed on the surface of the base plate inside the side enclosure; the positioning shaft is arranged on the surface of the base I; there are six reference columns, It includes a base II and a reference step; the base II is a rectangular column, fixed at intervals on the surface of the substrate inside the side enclosure; the reference step is a convex shape, fixed on the upper surface of the base II; the pressure head is six, It includes a base III, an articulated seat I, a rocker I, a locking column I, a locking pin I, a wrench I and a clamping mechanism; the base III is a rectangular cylinder, which is fixed at intervals on the surface of the substrate outside the side enclosure; the articulated seat I is fixed on the surface of the base III, a hinge shaft is provided at the rear end of the articulated seat I, and a locking through hole is provided at the front end; the rocker I is a long strip rod, and the rear end is hinged to the rear end of the articulated seat I; the locking column I is a circular cylinder, which is inserted into the locking through hole at the front end of the articulated seat, and a spiral groove is provided on the outer circle of the locking column I; the locking pin I is fixed directly above the spiral groove of the locking column I through the through hole above the articulated seat I; the wrench I is fixed to the outer end of the locking column I; the clamping mechanism is fixed to the front end of the rocker I; the reference plates are six, It includes a base IV, an articulated seat II, a rocker II, a locking column II, a locking pin II, a wrench II and a gauge plate; the shapes and structures of the base IV, the articulated seat II, the rocker II, the locking column II, the locking pin II and the wrench II are the same as the corresponding parts of the pressure head, and the assembly structure is also the same; the gauge plate is a T-shaped or L-shaped rigid metal strip with a rectangular cross-section, and is fixed to the front end of the rocker II, and a plurality of detection planes are arranged on the lower side of the metal strip; the go / no-go gauge includes a handle, a passing end and a blocking end; the handle is a polygonal column, and the two ends are divided into A passing end and a blocking end are respectively provided; the passing end is a bent round rod, the diameter of which is smaller than the detection gap and is the minimum size required by the design; the blocking end is a bent round rod, the diameter of which is larger than the detection gap and is the maximum size required by the design; wherein, after the fixing position and height of the reference column are placed in the side enclosure frame with the qualified quarter-backrest welding surface facing upward, the inner surfaces of the convex steps at the four corners and the middle of the long side of the quarter-backrest are in close contact with the upper surfaces of the corresponding reference column reference steps, and the upper surfaces of all reference steps are on the same plane. The fixing position and height of the positioning column shall be based on the condition that the inner surfaces of the convex steps at the four corners and the middle of the long side of the qualified quarter-backrest backboard are in close contact with the upper surfaces of the corresponding reference steps of the reference column, and the two through holes at the diagonal positions of the quarter-backrest backboard are respectively inserted on the positioning shaft; the fixing position and height of the pressure head shall be based on the condition that after the clamping mechanism is in the clamping state, the clamping surfaces of each clamping mechanism respectively coincide with and are in close contact with the upper surfaces of the corresponding reference steps; the fixing position and height of the reference plate shall be based on the welding surface of the qualified quarter-backrest backboard After it is placed upwards on the positioning column and the reference column and the clamping mechanism presses it on the reference column, the reference plate rocker II is rotated to a position perpendicular to the base IV and locked, and a set gap is left between the detection plane of the lower side of the gauge plate at the front end of the rocker II and the convex step surface of the corresponding four-part backrest backboard, and the detection planes of the lower sides of all gauge plates are on the same plane, and this plane is parallel to the plane formed by the upper surfaces of all reference steps; the set gap between the detection plane and the convex step surface of the corresponding four-part backrest backboard is the detection gap.

2. According to claim 1, the welding surface inspection fixture for the four-part backrest of the rear seat of the automobile is characterized in that: The clamping mechanism, The invention comprises a hollow screw, a fastening nut, a sliding rod, a wrench III, a connecting rod, a screw, a cylindrical pressure head, a spring and an adjusting nut; a hinged cap is extended at the upper end of the hollow screw, and the threaded section is inserted into the through hole of the front end of the rocker I; the fastening nut is screwed onto the hollow screw, thereby fixing the hollow screw to the front end of the rocker I; the sliding rod is sleeved into the through hole of the hollow screw; the front end of the wrench III is provided with a U-shaped opening with two parallel sides bent into an L shape, and the short end of the L-shaped bend The front end of the side narrows inward; and hinge holes are provided at the front and rear ends of the short side of the L-shape bend; the upper end of the sliding rod is hinged to the front end of the short side of the L-shape bend; the connecting rod is a parallel structure, one end of which is hinged to the rear end of the short side of the L-shape bend, and the other end is hinged to the upper end of the hollow screw; the screw is screwed on the lower end of the sliding rod; the spring is sleeved between the adjusting nut of the screw and the cylindrical pressure head; the spring is sleeved on the screw; the cylindrical pressure head is installed at the lower end of the screw.

3. According to claim 2, the welding surface inspection fixture for the four-part backrest of the rear seat of the automobile is characterized in that: The rod of the wrench III is covered with a plastic sleeve or a rubber sleeve.

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