Auxiliary positioning tool for civil air defense door hinged support welding

Abstract

The utility model provides an auxiliary positioning tool for civil defense door hinged support welding, which comprises a positioning base, a lug plate positioning mechanism and a bottom plate positioning mechanism, the lug plate positioning mechanism and the bottom plate positioning mechanism are arranged on the positioning base, the bottom plate positioning mechanism comprises a transverse stop piece and two lateral stop pieces, the transverse stop piece is transversely arranged on the upper end face of the positioning base, and the lateral stop pieces are arranged on the lower end face of the positioning base. The two lateral stopping pieces are symmetrically arranged at the two ends of the transverse stopping piece respectively and are perpendicular to the transverse stopping piece, a right-angled-U-shaped fence used for conducting auxiliary positioning on a hinged support bottom plate is formed on the upper end face of the positioning base, and the lug plate positioning mechanism is arranged over the right-angled-U-shaped fence formed by the transverse stopping piece and the lateral stopping pieces. The lug plate positioning mechanism is arranged on the positioning base, parallel to the positioning base and capable of freely ascending and descending up and down, and the lug plate positioning mechanism can descend to clamp the top ends of two to-be-welded hinged support lug plates placed on the hinged support bottom plate in the n-shaped fence so as to carry out auxiliary positioning on the two hinged support lug plates, so that positioning is convenient and rapid, and the welding efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil air defense door hinge welding, in particular to an auxiliary positioning tool for civil air defense door hinge welding. Background Art

[0002] Civil defense doors are doors at the entrances and exits of civil defense projects. They are mainly made of metal materials and have good sealing and impact resistance. They can effectively prevent harmful substances in the external environment from entering the interior of civil defense projects to ensure the safety of civil defense projects. Civil defense door hinges are installed at the entrances and exits of civil defense projects. They are used to install and support the main components of civil defense doors. Civil defense door hinges are mainly composed of welding of workpieces such as a base plate and two ear plates.

[0003] In the past, the welding method of civil air defense door hinges was mainly manual welding. During manual welding, the welding position of the ear plate was mainly measured and positioned by measuring tools. Manual measurement and positioning welding efficiency was low, and during the welding process, the ear plate was prone to displacement and positioning deviation, resulting in low welding quality.

[0004] In order to improve welding efficiency and quality, various positioning tools have been generally used in the prior art to assist in welding the hinge seats of civil air defense doors. For example, the authorization announcement number CN210997121U discloses a welding device for the hinge seats of civil air defense doors, which comprises a vertical panel arranged on the bottom panel, an upper horizontal panel and a lower horizontal panel arranged on the vertical panel, and a positioning circular tube arranged between the upper horizontal panel and the lower horizontal plate. The bottom panel is used to preliminarily position the lower surface of the bottom plate, and the vertical panel is used to position the horizontal position of the bottom plate. Positioning bolts are inserted through the positioning circular tubes, and the height positioning of the two hinge seat plates is completed by using the positioning bolts to pass through the circular through holes of the positioning circular tubes and the hinge seat plates. However, in actual use, this welding positioning device is not convenient enough because the positioning bolts are used to penetrate the ear plates for positioning, and the bottom plate position can only be preliminarily positioned, and the bottom plate cannot be offset to both sides. The offset of the bottom plate will cause the ear plate welding position to deviate. Therefore, the use effect is not ideal. Utility Model Content

[0005] In view of this, it is necessary to provide an auxiliary positioning tool for welding the hinge seat of a civil air defense door to solve the technical problems of inconvenient positioning and bottom plate offset in the prior art.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An auxiliary positioning tooling for welding a hinge seat of a civil air defense door, comprising a positioning base and an ear plate positioning mechanism and a bottom plate positioning mechanism arranged on the positioning base. The bottom plate positioning mechanism includes a transverse stopper and two lateral stoppers. The transverse stopper is horizontally arranged on the upper end surface of the positioning base. The two lateral stoppers are symmetrically arranged at both ends of the transverse stopper respectively, perpendicular to the transverse stopper, forming a U-shaped enclosure on the upper end surface of the positioning base for auxiliary positioning of the hinge seat bottom plate. The ear plate positioning mechanism is arranged directly above the U-shaped enclosure formed by the transverse stopper and the lateral stoppers, parallel to the positioning base, and can freely move up and down. When the ear plate positioning mechanism descends, it can hold the tops of the two hinge seat ear plates to be welded on the hinge seat bottom plate placed in the U-shaped enclosure, so as to perform auxiliary positioning on the two hinge seat ear plates.

[0008] Preferably, the ear plate positioning mechanism includes a column and an ear plate positioning frame. The column is vertically arranged on the upper end of the positioning base and is located outside the bottom plate positioning mechanism. One end of the ear plate positioning frame is sleeved on the column, and the other end is an ear plate positioning end, which extends horizontally directly above the U-shaped enclosure formed by the transverse stopper and the lateral stoppers. On the lower end surface of the ear plate positioning end facing the U-shaped enclosure, two parallel and symmetric positioning grooves are vertically spaced. The opening direction of the positioning grooves is parallel to the transverse stopper or the lateral stopper, and matches the tops of the hinge seat ear plates to be welded. The ear plate positioning frame can freely slide up and down along the column. When the ear plate positioning frame descends, it can hold and press down the tops of the two hinge seat ear plates to be welded through the two positioning grooves respectively, so as to perform auxiliary positioning on the two hinge seat ear plates.

[0009] Preferably, the distance between the two positioning grooves is a preset distance.

[0010] Preferably, a groove is formed along the length direction of the column, and a protrusion matching the groove is arranged at one end of the ear plate positioning frame sleeved on the column. The protrusion is clamped in the groove to limit the ear plate positioning frame and prevent it from rotating left and right.

[0011] Preferably, the ear plate positioning mechanism further includes a counterweight pressing block, which is detachably sleeved on the column and presses on the upper end of the ear plate positioning frame.

[0012] Preferably, the distance between the two lateral stoppers is a preset distance.

[0013] Preferably, two parallel channels are respectively opened at both ends of the transverse stopper along its length direction. Transverse adjusting arms that can extend towards both ends of the transverse stopper are respectively inserted into the two channels. At the center of the transverse stopper, between the two channels, a rotatable gear is arranged. Rack teeth meshing with the gear are arranged on the opposite side walls of the two transverse adjusting arms. Two lateral stoppers are respectively arranged at the ends of the two transverse adjusting arms extending out of the transverse stopper. By pushing one of the lateral stoppers to move along the channel towards the center direction of the transverse stopper, the other lateral stopper can be made to move synchronously in the opposite direction to center the hinge base plate placed in the U-shaped enclosure.

[0014] Preferably, an adjusting groove is longitudinally opened on the positioning base. A longitudinal adjusting arm matching the adjusting groove is arranged on the back of the transverse stopper. The longitudinal adjusting arm is inserted into the adjusting groove and can drive the transverse stopper to move along the opening direction of the adjusting groove. A fixing bolt is vertically arranged at the upper end of the longitudinal adjusting arm. The lower end of the fixing bolt vertically passes through the longitudinal adjusting arm. A clamping block is arranged at the end of the fixing bolt passing through the longitudinal adjusting arm. The clamping block is located at the lower end of the adjusting groove and is threadedly配合连接 with the fixing bolt to clamp the longitudinal adjusting arm on the adjusting groove.

[0015] Preferably, a scale is arranged along the length direction on the edge of the adjusting groove.

[0016] As can be seen from the above technical solutions, the auxiliary positioning tooling for welding the hinge seat of a civil air defense door provided by this application includes a positioning base and an ear plate positioning mechanism and a bottom plate positioning mechanism arranged on the positioning base. The bottom plate positioning mechanism includes a transverse stopper and two lateral stoppers. The transverse stopper is horizontally arranged on the upper end surface of the positioning base. The two lateral stoppers are symmetrically arranged at both ends of the transverse stopper respectively, perpendicular to the transverse stopper, forming a U-shaped enclosure on the upper end surface of the positioning base for auxiliary positioning of the hinge base plate. The ear plate positioning mechanism is arranged directly above the U-shaped enclosure formed by the transverse stopper and the lateral stoppers, parallel to the positioning base, and can freely move up and down. When the ear plate positioning mechanism descends, it can clamp the tops of the two hinge ears to be welded on the hinge base plate placed in the U-shaped enclosure to perform auxiliary positioning on the two hinge ears. This auxiliary positioning tooling combines the ear plate positioning mechanism and the bottom plate positioning mechanism to synchronously position the hinge ears and the hinge base plate, uses the U-shaped enclosure to perform enclosure positioning on three directions of the hinge base plate to prevent the hinge base plate from shifting, so that the hinge base plate maintains a proper state on the upper end surface of the positioning base. Moreover, positioning the hinge ears by the method of pressing and clamping is convenient and fast, which can improve the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of this utility model.

[0018] Figure 2 This is a schematic structural diagram of the utility model from another angle.

[0019] Figure 3 It is a schematic diagram of the assembly structure of the ear plate positioning mechanism.

[0020] Figure 4 It is a structural schematic diagram of the bottom plate positioning mechanism.

[0021] Figure 5 It is a schematic diagram of the meshing structure between the lateral adjustment arm and the gear.

[0022] Figure 6 Schematic diagram of the hinge structure for civil defense doors.

[0023] Figure 7 The utility model is a schematic diagram of the positioning state of the hinge seat bottom plate and the hinge seat ear plate.

[0024] In the figure: positioning base 1, adjustment groove 11, scale 12, ear plate positioning mechanism 2, column 21, ear plate positioning frame 22, positioning groove 23, groove 24, protrusion 25, counterweight block 26, bottom plate positioning mechanism 3, transverse stop 31, lateral stop 32, channel 33, transverse adjustment arm 34, gear 35, rack 36, longitudinal adjustment arm 37, fixing bolt 38, clamping block 39, locking bolt 40, hinge seat bottom plate 51, hinge seat ear plate 52. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Please see Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7, an embodiment of the present utility model provides an auxiliary positioning tooling for welding a hinge seat of a civil air defense door, which includes a positioning base 1, an ear plate positioning mechanism 2 and a bottom plate positioning mechanism 3 arranged on the positioning base 1. The positioning base 1 is a steel plate arranged in parallel, and the upper end surface of the positioning base 1 is a bearing surface for placing the bottom plate of the hinge seat of the civil air defense door. The bottom plate positioning mechanism 3 includes a transverse stopper 31 and two lateral stoppers 32. The transverse stopper 31 is horizontally arranged on the upper end surface of the positioning base 1, and the two lateral stoppers 32 are vertically arranged on the upper end surface of the positioning base 1 and are symmetrically arranged at both ends of the transverse stopper 31 respectively, perpendicular to the transverse stopper 31. The two lateral stoppers 32 and the transverse stopper 31 form a U-shaped enclosure structure on the upper end surface of the positioning base 1. The U-shaped enclosure is used to place the hinge seat bottom plate 51. The distance between the two lateral stoppers 32 is a preset distance, which matches the length of the hinge seat bottom plate 51 to be placed. The hinge seat bottom plate 51 is limited or positioned by the U-shaped enclosure. When positioning the hinge seat bottom plate 51, the hinge seat bottom plate 51 is placed parallel in the U-shaped enclosure, and the two lateral stoppers 32 are used to enclose and limit the two ends of the hinge seat bottom plate 51 in the length direction, and one side of the hinge seat bottom plate 51 is abutted against the transverse stopper 31. The transverse stopper 31 and the two lateral stoppers 32 are used to enclose and position the hinge seat bottom plate 51 in three directions to prevent the hinge seat bottom plate 51 from moving and keep the hinge seat bottom plate 51 in a proper state on the upper end surface of the positioning base 1. The ear plate positioning mechanism 2 is arranged directly above the U-shaped enclosure formed by the transverse stopper 31 and the lateral stoppers 32, is parallel to the positioning base 1, and can freely move up and down. When positioning the hinge seat ear plate 52, after lifting the ear plate positioning mechanism 2, the two hinge seat ear plates 52 to be welded are vertically placed on the hinge seat bottom plate 51 in the U-shaped enclosure, and the ear plate positioning mechanism 2 is lowered to simultaneously clamp the tops of the two hinge seat ear plates 52 to be welded, so as to assist in positioning the two hinge seat ear plates 52 at the same time.

[0027] Specifically, the earplate positioning mechanism 2 includes a vertical column 21 and an earplate positioning frame 22. The vertical column 21 is vertically arranged on the upper end surface of the positioning base 1 and is located outside the bottom plate positioning mechanism 3, preferably outside the transverse stop 31. One end of the earplate positioning frame 22 is fixedly provided with a sliding sleeve, which is sleeved on the vertical column 21, and the other end is the earplate positioning end. The earplate positioning frame 22 is horizontally arranged, and the earplate positioning end of the earplate positioning frame 22 extends parallel to directly above the U-shaped enclosure formed by the transverse stop 31 and the lateral stop 32. On the lower end surface of the earplate positioning end facing the U-shaped enclosure, two parallel and symmetric positioning grooves 23 are vertically spaced apart. The opening directions of the two positioning grooves 23 are parallel to the lateral stop 32 and match the top of the hinge seat earplate 52 to be welded. The distance between the two positioning grooves 23 is a preset distance, which is opened according to the distance between the two hinge seat earplates 52. The earplate positioning frame 22 can freely slide up and down along the vertical column 21. When positioning the hinge seat earplate 52, the earplate positioning frame 22 can be manually lifted to slide upward along the vertical column 21. The two hinge seat earplates 52 to be welded are vertically placed on the hinge seat bottom plate 51 in the U-shaped enclosure. Then, the earplate positioning frame 22 is lowered, and the two positioning grooves 23 on the earplate positioning frame 22 are respectively stuck on the tops of the two hinge seat earplates 52 to be welded to assist in positioning the two hinge seat earplates 52. And the self-weight of the earplate positioning frame 22 is used to press on the two hinge seat earplates 52, so that the two hinge seat earplates 52 are stably erected on the hinge seat bottom plate 51. Also, during welding, a downward pressure can be applied to the earplate positioning frame 22 by hand to increase the downward pressure to ensure stability during the welding process. After welding is completed, the earplate positioning frame 22 is manually lifted upward to separate the earplate positioning frame 22 from the two hinge seat earplates 52, and then the welded civil air defense door hinge seat can be taken out.

[0028] In the above embodiment, the installation positions or positioning methods of the earplate positioning mechanism 2 and the bottom plate positioning mechanism 3 can be changed according to usage habits or usage conditions. For example, the two lateral stops 32 can be used to enclose and limit the two sides in the width direction of the hinge seat bottom plate 51, and one end in the length direction of the hinge seat bottom plate 51 is closely abutted against the transverse stop 31 to limit the hinge seat bottom plate 51; the vertical column 21 is arranged outside one of the lateral stops 32, and the earplate positioning end of the earplate positioning frame 22 extends along the lateral stop 32 to directly above the U-shaped enclosure. The opening directions of the two positioning grooves 23 on the earplate positioning end are perpendicular to the lateral stop 32 to assist in positioning the hinge seat earplate 52. The positioning method is the same as that in the above embodiment.

[0029] Please refer to Figure 3, Further, the column 21 is a cylinder, and a groove 24 is provided along the length direction of the column 21. A protrusion 25 matching the groove 24 is provided on the inner wall of the sliding sleeve at the end of the ear plate positioning frame 22. The protrusion 25 is clamped in the groove 24 to limit the ear plate positioning frame 22 and prevent the ear plate positioning frame 22 from rotating left and right.

[0030] Further, in order to increase the downward pressure of the ear plate positioning frame 22 and enable the ear plate positioning frame 22 to press more stably on the two hinge seat ear plates 52, a counterweight block 26 is sleeved on the column 21. The counterweight block 26 can slide up and down along the column 21 and is detachable. When positioning the hinge seat ear plate 52, the counterweight block 26 is sleeved on the column 21 and pressed on the upper end of the ear plate positioning frame 22 to increase the weight of the ear plate positioning frame 22.

[0031] Please refer to Figure 1 、 Figure 4 and Figure 5 , Further, in a preferred embodiment, in order to improve the applicability of the bottom plate positioning mechanism 3 and enable the bottom plate positioning mechanism 3 to perform centering positioning on hinge seat bottom plates 51 of different length specifications, two parallel channels 33 are respectively provided at both ends of the transverse stop 31 along its length direction. A transverse adjusting arm 34 is inserted in each of the two channels 33. The transverse adjusting arm 34 can telescopically move along the channel 33 towards both ends of the transverse stop 31. The two channels 33 communicate with each other at the center of the transverse stop 31. A rotatable gear 35 is provided at the center of the transverse stop 31 between the two channels 33. Rack teeth 36 meshing with the gear 35 are provided on the opposite side walls of the two transverse adjusting arms 34. The two lateral stops 32 are respectively provided at the ends of the two transverse adjusting arms 34 extending out of the transverse stop 31. The gear 35 is used to interconnect the two transverse adjusting arms 34. When one of the lateral stops 32 is pushed or pulled to move along the channel 33, under the action of the gear 35, the other lateral stop 32 can move synchronously towards or away from each other to adjust the distance between the two lateral stops 32. When positioning the hinge seat bottom plate 51, the two lateral stops 32 can be first pulled away from each other, and the hinge seat bottom plate 51 is placed in the U-shaped enclosure and one side of it is made to closely abut against the transverse stop 31, and then the two lateral stops 32 are pushed towards each other. The two lateral stops 32 move synchronously towards the center direction of the transverse stop 31 along the channel 33 under the action of the gear 35, and finally both of the two lateral stops 32 abut against both ends of the hinge seat bottom plate 51. In this way, the hinge seat bottom plate 51 can be centered and positioned, preventing the hinge seat bottom plate 51 from shifting to one side of the transverse stop 31.

[0032] Please continue to refer to Figure 1In order to prevent the lateral stopper 32 from moving outward during welding, a locking bolt 40 is provided on the back of one of the channels 33. The locking bolt 40 is threadedly connected to the channel 33 and can penetrate the inner wall of the channel 33 and abut against the lateral adjustment arm 34 in the channel 33 to lock the position of the lateral adjustment arm 34 and prevent the lateral stopper 32 from moving.

[0033] Please continue to see Figure 1 and Figure 4 Furthermore, in order to enable the base plate positioning mechanism 3 to adapt to the positioning of the hinge base plates 51 of different width specifications, an adjustment slot 11 is longitudinally opened on the positioning base 1, and a longitudinal adjustment arm 37 matching the adjustment slot 11 is provided on the back of the transverse stopper 31. The longitudinal adjustment arm 37 is inserted in the adjustment slot 11 and can drive the transverse stopper 31 to move along the opening direction of the adjustment slot 11. A fixing bolt 38 is vertically arranged on the upper end of the longitudinal adjustment arm 37, and the lower end of the fixing bolt 38 vertically passes through the longitudinal adjustment arm 37. A clamping block 39 is arranged at the end of the fixing bolt 38 passing through the longitudinal adjustment arm 37. The clamping block 39 is located at the lower end of the adjustment slot 11 and is threadedly connected with the fixing bolt 38 to clamp the longitudinal adjustment arm 37 on the adjustment slot 11. A scale 12 is arranged on the edge of the adjustment slot 11 along its length direction. When positioning the hinge base plate 51, the transverse stopper 31 can be longitudinally displaced according to the specifications of the positioned hinge base plate 51 to realize the forward or backward positioning adjustment of the hinge base plate 51. The displacement adjustment method of the transverse stopper 31 is: after manually loosening the fixing bolt 38, the transverse stopper 31 is pushed to move along the adjustment groove 11. During the movement, the scale 12 can be used for positioning. After the displacement is completed, it is locked again by the fixing bolt 38.

[0034] In the above embodiment, the ear plate positioning frame 22 is a replaceable part, and a plurality of replacement parts matching it can be prefabricated according to the manufacturing size of the civil defense door hinge or the specifications of the hinge ear plate 52. During specific use, it can be replaced according to different production needs.

[0035] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. An auxiliary positioning tool for welding a hinge seat of a civil air defense door, characterized in that: It includes a positioning base, an ear plate positioning mechanism and a bottom plate positioning mechanism arranged on the positioning base. The bottom plate positioning mechanism includes a transverse stopper and two lateral stoppers. The transverse stopper is horizontally arranged on the upper end surface of the positioning base. The two lateral stoppers are symmetrically arranged at both ends of the transverse stopper respectively, perpendicular to the transverse stopper, and form a U-shaped enclosure on the upper end surface of the positioning base for auxiliary positioning of the hinge base bottom plate. The ear plate positioning mechanism is arranged directly above the U-shaped enclosure formed by the transverse stopper and the lateral stoppers, parallel to the positioning base, and can freely move up and down. When the ear plate positioning mechanism descends, it can clamp the tops of the two hinge ears to be welded on the hinge base bottom plate placed in the U-shaped enclosure to assist in positioning the two hinge ears.

2. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 1, characterized in that: The ear plate positioning mechanism includes a column and an ear plate positioning frame. The column is vertically arranged on the upper end of the positioning base and is located outside the bottom plate positioning mechanism. One end of the ear plate positioning frame is sleeved on the column, and the other end is the ear plate positioning end. This ear plate positioning end extends parallel to directly above the U-shaped enclosure formed by the transverse stopper and the lateral stoppers. On the lower end surface of the ear plate positioning end facing the U-shaped enclosure, two parallel and symmetric positioning grooves are vertically spaced. The opening direction of the positioning grooves is parallel to the transverse stopper or the lateral stopper, and is matched with the tops of the hinge ears to be welded. The ear plate positioning frame can freely slide up and down along the column. When the ear plate positioning frame descends, it can clamp and press down the tops of the two hinge ears to be welded through the two positioning grooves respectively to assist in positioning the two hinge ears.

3. The auxiliary positioning tool for welding the hinge seat of a civil air defense door as claimed in claim 2, characterized in that: The distance between the two positioning grooves is a preset distance.

4. The auxiliary positioning tool for welding the hinge seat of a civil air defense door as claimed in claim 3, characterized in that: A groove is provided along the length direction of the column. A protrusion matching the groove is provided at the end of the ear plate positioning frame sleeved on the column. The protrusion is clamped in the groove to limit the ear plate positioning frame and prevent it from rotating left and right.

5. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 4, characterized in that: The ear plate positioning mechanism further includes a counterweight block. The counterweight block is detachably sleeved on the column and presses on the upper end of the ear plate positioning frame.

6. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 1 or 5, characterized in that: The distance between the two lateral stoppers is a preset distance.

7. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 1 or 5, characterized in that: Two parallel channels are respectively provided at both ends of the transverse stopper along its length direction. Transverse adjusting arms that can extend towards both ends of the transverse stopper are respectively inserted into the two channels. At the center of the transverse stopper, between the two channels, a rotatable gear is provided. Rack teeth meshing with the gear are provided on the opposite side walls of the two transverse adjusting arms. The two lateral stoppers are respectively arranged at the ends of the two transverse adjusting arms extending out of the transverse stopper. By pushing one of the lateral stoppers to move towards the center of the transverse stopper along the channel, the other lateral stopper can be made to move synchronously in the opposite direction to center the hinge base bottom plate placed in the U-shaped enclosure.

8. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 7, characterized in that: An adjustment slot is longitudinally provided on the positioning base, and a longitudinal adjustment arm matching the adjustment slot is provided on the back of the transverse stop member. The longitudinal adjustment arm is inserted in the adjustment slot and can drive the transverse stop member to move along the opening direction of the adjustment slot. A fixing bolt is vertically provided on the upper end of the longitudinal adjustment arm, and the lower end of the fixing bolt vertically passes through the longitudinal adjustment arm. A clamping block is provided at the end of the fixing bolt passing through the longitudinal adjustment arm, and the clamping block is located at the lower end of the adjustment slot and is threadedly connected with the fixing bolt to clamp the longitudinal adjustment arm on the adjustment slot.

9. The auxiliary positioning tool for welding the hinge seat of a civil air defense door according to claim 8, characterized in that: A scale is arranged on the edge of the adjusting groove along its length direction.

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