Welding fixing tool for bed frame with longitudinal beams

Abstract

A longitudinal beam positioning mechanism comprises a longitudinal beam pressing assembly and a longitudinal beam supporting assembly, the longitudinal beam pressing assembly is provided with a longitudinal beam positioning block with lifting and rotating freedom degrees, and the longitudinal beam supporting assembly comprises a supporting seat, a supporting installation seat, a supporting block and a lifting block. The lower end of the tight-supporting mounting seat is arranged on the positioning frame, the upper end of the tight-supporting mounting seat is provided with a placing groove for placing the two longitudinal beams, the tight-supporting seat is arranged in the middle of the placing groove and located between the two longitudinal beams, telescopic tight-supporting blocks are arranged on the two sides of the tight-supporting seat, a lifting block is arranged in the tight-supporting seat, and a lifting slope is arranged on the lower side of the lifting block; the inner sides of the tight supporting blocks are provided with tight supporting slopes matched with the lifting slopes, tension spring connecting rods are arranged on the portions, on the two sides of the tight supporting base, of the tight supporting blocks, and the tension spring connecting rods on the same side are connected through tension springs. According to the utility model, the frame, the longitudinal beam, the cross beam and the middle beam assembly which form the bed frame can be accurately positioned during welding, so that the welding quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of welding tooling, and specifically to a welding fixing tooling for a bed frame with longitudinal beams. BACKGROUND

[0002] With the development of technology, some bed frame welding positioning toolings have appeared in the prior art, such as the bed frame welding positioning tooling disclosed in CN220659752U, which comprises a bottom plate and multiple sets of positioning assemblies, the bottom plate has multiple mounting positions arranged along the length direction, and the multiple sets of positioning assemblies are respectively mounted on each mounting position and can be detached relative to the mounting position. However, the positioning assembly of this tooling is mainly composed of a positioning seat and a mounting plate. When assembling the positioning assembly, the upper connecting hole of the mounting plate needs to be corresponded with the lower connecting hole on the bottom plate, and then a positioning pin or a bolt is inserted to position the positioning assembly on the corresponding mounting position and position the bed frame. When the size needs to be adjusted, the positioning pin or the bolt is simply detached to move the position of the positioning assembly.

[0003] CN210849011U discloses a flexible welding positioning tooling for medical bed frame welding, which comprises a base, left and right side beam positioning and clamping assemblies are respectively installed on the left and right sides of the base, a first intermediate beam positioning and clamping assembly and a rear end positioning and clamping assembly are installed at the rear end of the base, and a second intermediate beam positioning and clamping assembly is installed at the front end of the base. When the tooling is used, the left side beam, the right side beam, the first intermediate beam, the second intermediate beam and the rear end beam of the medical bed frame need to be clamped and positioned.

[0004] However, some special purpose bed frames, such as elderly care bed frames, have longitudinal beams arranged along the length direction of the bed frame in addition to the frame and the intermediate cross beams, and the spacing between adjacent two longitudinal beams also needs to be controlled in many cases, which requires further improvement of the existing bed frame welding fixing tooling. For example, CN221159062U discloses a welding positioning device, which is provided with a longitudinal beam limiting mechanism. The longitudinal beam limiting mechanism of the device comprises a support frame, and longitudinal beam fixing assemblies for clamping and limiting the longitudinal beams are arranged at the front and rear ends of the support frame. A clamping assembly for clamping and limiting the cross beams between the longitudinal beams is arranged between the longitudinal beam fixing assemblies. The longitudinal beam fixing assembly comprises a screw rod arranged on the support frame, a limiting seat connected to the screw rod, a slot opened on the opposite surface of the limiting seat, a guide column slidably connected to the upper side of the slot, a first pressing plate fixed to the lower end of the guide column, a spring sleeved on the outer diameter of the guide column above the first pressing plate, and a clamping plate fixed to the opposite end of the slide column. The clamping assembly comprises support plates fixed to the two sides of the support frame, a slide column slidably connected to the support plates, and a clamping plate fixed to the opposite end of the slide column. A spring is sleeved on the slide column between the clamping plate and the support plate. The structure of the longitudinal beam limiting mechanism is relatively complex. SUMMARY

[0005] The utility model discloses a kind of welding fixing tool for bed frame with longitudinal beam, it can guarantee that the frame, longitudinal beam, crossbeam and middle beam component of bed frame are positioned accurately when welding, to further guarantee welding quality.

[0006] The utility model discloses a kind of welding fixing tool for bed frame with longitudinal beam, it can guarantee that the frame, longitudinal beam, crossbeam and middle beam component of bed frame are positioned accurately when welding, to further guarantee welding quality.

[0007] A kind of welding fixing tool for bed frame with longitudinal beam, including positioning frame and the frame positioning assembly, crossbeam positioning assembly, middle beam positioning assembly and longitudinal beam positioning mechanism on the positioning frame, wherein the longitudinal beam positioning mechanism includes longitudinal beam pressing assembly and longitudinal beam bracing assembly, the longitudinal beam pressing assembly is equipped with longitudinal beam positioning block with lifting and rotating freedom, the longitudinal beam bracing assembly includes bracing seat, bracing mounting seat, bracing block and lifting block, wherein bracing mounting seat lower end is on the positioning frame, upper end is equipped with the placement slot of placing two longitudinal beams, bracing seat is in the middle part of the placement slot and between two longitudinal beams, the bracing block of the bracing seat both sides is equipped with telescopic, the bracing seat inside is equipped with lifting block, and the lower side of the lifting block is equipped with lifting inclined plane, the bracing block inboard is equipped with bracing inclined plane matched with the lifting inclined plane, bracing block on the bracing seat both sides is equipped with tension spring connecting rod, and same side tension spring connecting rod is connected by tension spring.

[0008] Bracing cylinder is equipped on the bracing mounting seat, and the lifting block is driven lifting by the bracing cylinder.

[0009] The longitudinal beam pressing assembly includes pressing mounting seat and longitudinal beam positioning drive device, wherein pressing mounting seat is mounted on the positioning frame, longitudinal beam positioning drive device is on the pressing mounting seat, longitudinal beam positioning block is on the longitudinal beam positioning drive device.

[0010] The frame positioning assembly and crossbeam positioning assembly are same structure, and both include positioning mounting seat on the positioning frame, and the positioning mounting seat is equipped with pressing block drive device, limit block and jacking cylinder, the positioning pressing block with lifting and rotating freedom is equipped on the pressing block drive device.

[0011] The middle beam positioning assembly includes middle beam positioning seat on the positioning frame, and the middle beam positioning seat is equipped with first positioning cylinder, second positioning cylinder, first limit seat, second limit seat, first pressing drive device and second pressing drive device, wherein the first pressing drive device has the first positioning block with lifting and rotating freedom, the second pressing drive device is equipped with the second positioning block with lifting and rotating freedom.

[0012] The middle beam assembly in the middle part of the bed frame comprises a first middle beam and a second middle beam, and the first middle beam is limited in horizontal direction displacement by the first positioning cylinder and the first limiting seat and in vertical direction displacement by the first positioning block pressing, and the second middle beam is limited in horizontal direction displacement by the second positioning cylinder and the second limiting seat and in vertical direction displacement by the second positioning block pressing.

[0013] The positioning frame is driven to rotate by a turnover mechanism, the turnover mechanism comprises a base and turnover support seats arranged at two ends of the base, one of the turnover support seats is provided with a turnover motor, the other turnover support seat is provided with a turnover bearing seat, both ends of the positioning frame are provided with turnover connecting plates, one end of the turnover connecting plate of the positioning frame is connected with a power shaft of the turnover motor, and the other end of the turnover connecting plate is provided with a rotating shaft installed in the turnover bearing seat.

[0014] The bed frame to be welded comprises a frame, the middle part of the frame is provided with a middle beam assembly, both sides of the front part of the frame are provided with two groups of longitudinal beams, and the rear part of the frame is internally provided with a cross beam, wherein the frame is fixed by the frame positioning assembly, the cross beam is fixed by the cross beam positioning assembly, the middle beam assembly is fixed by the middle beam positioning assembly, and the longitudinal beam is positioned by the longitudinal beam positioning mechanism.

[0015] The bed frame to be welded comprises a frame, the middle part of the frame is provided with a middle beam assembly, both sides of the front part of the frame are provided with two groups of longitudinal beams, and the rear part of the frame is internally provided with a cross beam, wherein the frame is fixed by the frame positioning assembly, the cross beam is fixed by the cross beam positioning assembly, the middle beam assembly is fixed by the middle beam positioning assembly, and the longitudinal beam is positioned by the longitudinal beam positioning mechanism.

[0016] 1. The longitudinal beam positioning mechanism of the bed frame is provided with a longitudinal beam pressing assembly and a longitudinal beam straining assembly, two longitudinal beams are first placed in the placing groove at the upper end of the corresponding side longitudinal beam straining assembly to realize preliminary positioning, then the lifting block in the longitudinal beam straining assembly is lowered and drives the straining blocks on both sides of the straining seat to move outward by the cooperation of the lower end lifting inclined surface and the straining inclined surface to complete the positioning in the horizontal direction, and the above structure can ensure accurate positioning of the longitudinal beam and has simple and compact structure.

[0017] 2. The frame positioning assembly and the cross beam positioning assembly have the same structure, so that the number of positioning assembly modules can be reduced, and the cost is reduced.

[0018] 3. The positioning frame can be driven to turn over by the turnover mechanism to meet the multi-angle welding needs of the welding robot. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model,

[0020] Figure 2 It is an enlarged view of A in Figure 1 ​

[0021] Figure 3 for Figure 2 the frame positioning assembly in FIG.

[0022] Figure 4 for Figure 1 the enlarged view at B in FIG.

[0023] Figure 5 for Figure 4 the intermediate beam positioning assembly in FIG.

[0024] Figure 6 for Figure 1 the enlarged view at C in FIG.

[0025] Figure 7 for Figure 6 the longitudinal beam tensioning assembly in FIG.

[0026] Figure 8 for Figure 7 the H-H view in FIG.

[0027] Figure 9 for Figure 1 the sectional view of the utility model in FIG.

[0028] Figure 10 for Figure 1 the bed frame structure schematic diagram in FIG.

[0029] Wherein, 1 is the bed frame, 101 is the frame, 102 is the longitudinal beam, 103 is the intermediate beam assembly, 1031 is the first intermediate beam, 1032 is the second intermediate beam, 104 is the cross beam, 2 is the frame positioning assembly, 201 is the tensioning cylinder, 202 is the positioning block, 203 is the block driving device, 204 is the positioning mounting seat, 205 is the limiting block, 3 is the cross beam positioning assembly, 4 is the intermediate beam positioning assembly, 401 is the first positioning block, 402 is the second positioning cylinder, 403 is the first compression driving device, 404 is the first positioning cylinder, 405 is the intermediate beam positioning seat, 406 is the second compression driving device, 407 is the second positioning block, 5 is the longitudinal beam positioning mechanism, 501 is the longitudinal beam tensioning assembly, 5011 is the longitudinal beam positioning block, 5012 is the longitudinal beam positioning driving device, 5013 is the compression mounting seat, 502 is the longitudinal beam tensioning assembly, 5021 is the tensioning seat, 5022 is the tensioning cylinder, 5023 is the tensioning mounting seat, 50231 is the placing groove, 5024 is the tensioning block, 50241 is the tensioning inclined surface, 5025 is the tension spring connecting rod, 5026 is the tension spring, 5027 is the lifting block, 6 is the turnover mechanism, 601 is the positioning frame, 6011 is the turnover connecting plate, 602 is the turnover motor, 603 is the turnover bearing seat, 604 is the turnover support seat, 605 is the base, 7 is the frame compression assembly. DETAILED DESCRIPTION

[0030] The utility model will be further described in detail below with reference to the drawings.

[0031] As Figures 1-10 shown, the utility model discloses positioning frame 601 and be located frame positioning assembly 2, crossbeam positioning assembly 3, middle beam positioning assembly 4 and longitudinal beam positioning mechanism 5 on positioning frame 601, wherein as Figure 10 shown, the bed frame 1 of the utility model includes frame 101, and the middle part of frame 101 is provided with middle beam assembly 103, and the front part of frame 101 is provided with two groups of longitudinal beams 102, and the interval of two longitudinal beams 102 in each group is equal and needs to meet the design requirement, and the rear part of frame 101 is provided with crossbeam 104. When the utility model works, frame 101 is fixed through frame positioning assembly 2, crossbeam 104 is fixed through crossbeam positioning assembly 3, middle beam assembly 103 is fixed through middle beam positioning assembly 4, and longitudinal beam 102 is positioned through longitudinal beam positioning mechanism 5.

[0032] As Figures 6-8 shown, in the embodiment, longitudinal beam positioning mechanism 5 includes longitudinal beam pressing assembly 501 and longitudinal beam strutting assembly 502, wherein longitudinal beam pressing assembly 501 is provided with longitudinal beam positioning block 5011 with lifting and rotating degrees of freedom, longitudinal beam strutting assembly 502 includes strutting seat 5021, strutting mounting seat 5023, strutting block 5024 and lifting block 5027, wherein the lower end of strutting mounting seat 5023 is arranged on positioning frame 601, the upper end is provided with placing groove 50231 for placing two longitudinal beams 102, strutting seat 5021 is arranged in the middle part of placing groove 50231 and is located between two longitudinal beams 102, the both sides of strutting seat 5021 are provided with telescopic strutting block 5024, the inside of strutting seat 5021 is provided with lifting block 5027, and as Figure 8 shown, the lower side of lifting block 5027 is provided with lifting inclined plane, the inside of strutting block 5024 is provided with strutting inclined plane 50241 matched with lifting inclined plane, as Figure 7 shown, the strutting block 5024 on the both sides of strutting seat 5021 is provided with pull spring connecting rod 5025, and the pull spring connecting rod 5025 on the same side is connected through pull spring 5026. When the utility model works, two longitudinal beams 102 are placed in placing groove 50231 on the upper end of corresponding side longitudinal beam strutting assembly 502 to realize preliminary positioning, then as Figure 8As shown, the lifting block 5027 is lowered and drives the support blocks 5024 on both sides of the support seat 5021 to move outward by the cooperation of the lower end lifting slope and the support slope 50241, and is respectively pressed against the corresponding side of the longitudinal beam 102 to complete the horizontal positioning, while the longitudinal beam positioning block 5011 in the longitudinal beam pressing assembly 501 is lowered to press the corresponding side of the longitudinal beam 102 to complete the vertical positioning, after the processing is completed, the longitudinal beam positioning block 5011 is raised and rotated by 90° to ensure that the bed frame 1 can be taken out, and the lifting block 5027 is raised to make the support blocks 5024 on both sides move inward under the action of the tension spring 5026 and no longer support the longitudinal beam 102.

[0033] As shown in the drawings, Figures 6-8 In the embodiment, the support mounting seat 5023 is provided with a support cylinder 5022, and the lifting block 5027 is driven to lift by the support cylinder 5022.

[0034] As shown in the drawings, Figures 6-8 In the embodiment, the longitudinal beam pressing assembly 501 comprises a pressing mounting seat 5013 and a longitudinal beam positioning driving device 5012, wherein the pressing mounting seat 5013 is mounted on the positioning frame 601, the longitudinal beam positioning driving device 5012 is arranged on the pressing mounting seat 5013, and the longitudinal beam positioning block 5011 is arranged on the longitudinal beam positioning driving device 5012. In the embodiment, the longitudinal beam positioning driving device 5012 comprises a cylinder and a motor connected in sequence, and the longitudinal beam positioning block 5011 is mounted on the motor, the motor is driven to lift together with the longitudinal beam positioning block 5011 by the cylinder, and the longitudinal beam positioning block 5011 is driven to rotate by the motor to ensure that the bed frame 1 can be put in or taken out.

[0035] As shown in the drawings, Figures 1-3 In the embodiment, the frame positioning assembly 2 and the cross beam positioning assembly 3 are the same in structure, and both comprise a positioning mounting seat 204 arranged on the positioning frame 601, and the positioning mounting seat 204 is provided with a pressing block driving device 203, a limiting block 205 and a jacking cylinder 201, and the pressing block driving device 203 is provided with a positioning pressing block 202 with lifting and rotating degrees of freedom. During the working of the utility model, the limiting block 205 and the jacking cylinder 201 cooperate to fix the corresponding side beam of the frame 101 or the corresponding cross beam 104 along the horizontal direction, and the positioning pressing block 202 presses and fixes the corresponding side beam of the frame 101 or the corresponding cross beam 104 along the vertical direction. In the embodiment, the pressing block driving device 203 and the longitudinal beam positioning driving device 5012 are the same in structure, and both comprise a motor and a cylinder, so that the positioning pressing block 202 can be rotated by 90° to ensure that the bed frame 1 can be put in and taken out.

[0036] In addition, as shown in the drawings, Figures 1-2As shown, the utility model also can set up frame compression assembly 7 only on the outer side of any side beam of frame 101 according to need to realize auxiliary compression, frame compression assembly 7 only includes the abovementioned pressing block drive device 203 and positioning pressing block 202.

[0037] As Figures 4-5 As shown, in the embodiment, the middle beam assembly 103 of the bed frame 1 includes a first middle beam 1031 and a second middle beam 1032, the middle beam positioning assembly 4 includes a middle beam positioning seat 405 provided on the positioning frame 601, and the middle beam positioning seat 405 is provided with a first positioning cylinder 404, a second positioning cylinder 402, a first limiting seat, a second limiting seat, a first compression driving device 403 and a second compression driving device 406, wherein the first compression driving device 403 is provided with a first positioning block 401 having lifting and rotating degrees of freedom, and the second compression driving device 406 is provided with a second positioning block 407 having lifting and rotating degrees of freedom. During operation of the utility model, the first middle beam 1031 is limited in horizontal direction displacement by cooperation of the first positioning cylinder 404 and the first limiting seat, and is limited in vertical direction displacement by compression of the first positioning block 401, the second middle beam 1032 is limited in horizontal direction displacement by cooperation of the second positioning cylinder 402 and the second limiting seat, and is limited in vertical direction displacement by compression of the second positioning block 407, the first compression driving device 403 and the second compression driving device 406 are the same in structure as the longitudinal beam positioning driving device 5012, and both include a motor and a cylinder, so that the first positioning block 401 and the second positioning block 407 can be rotated by 90° to ensure that the bed frame 1 is put in or taken out.

[0038] The positioning mounting seat 204, the middle beam positioning seat 405, the compression mounting seat 5013 and the tension mounting seat 5023 can be fixed structures, or can be sliding structures that can be adjusted according to actual needs, such as the lower end of each seat body being provided with a sliding groove and the corresponding beam body of the positioning frame 601 being slidingly matched, and each seat body being provided with a locking bolt or other locking element to ensure locking positioning, or the sliding connection structure in the CN210849011U patent can be used, which is a publicly known technology in the field.

[0039] As Figure 1 And Figure 9As shown, in the embodiment, the positioning frame 601 is driven to rotate by a turnover mechanism 6, the turnover mechanism 6 comprises a base 605 and turnover support seats 604 arranged at two ends of the base 605, one of the turnover support seats 604 is provided with a turnover motor 602, the other turnover support seat 604 is provided with a turnover bearing seat 603, both ends of the positioning frame 601 are provided with turnover connecting plates 6011, the turnover connecting plate 6011 at one end of the positioning frame 601 is connected with a power shaft of the turnover motor 602, and the turnover connecting plate 6011 at the other end is provided with a rotating shaft installed in the turnover bearing seat 603.

[0040] The working principle of the utility model is as follows:

[0041] During working, the frame 101, the longitudinal beam 102, the intermediate beam assembly 103 and the cross beam 104 constituting the bed frame 1 are placed on the corresponding positions on the positioning frame 601 by a mechanical hand or manually, then the frame positioning assembly 2, the cross beam positioning assembly 3, the intermediate beam positioning assembly 4 and the longitudinal beam positioning mechanism 5 are started to complete the positioning of the above-mentioned components in the horizontal and vertical directions respectively, after the positioning is completed, the welding mechanical arm is started to weld each part according to the set degree, after the welding is completed, the positioning blocks in each positioning assembly are first lifted and then rotated by 90° to avoid blocking the bed frame 1, and then the bed frame 1 after the welding is completed is taken down by the mechanical hand or manually.

[0042] As shown, Figure 10 The longitudinal beam positioning mechanism 5 of the utility model is provided with a longitudinal beam pressing assembly 501 and a longitudinal beam strutting assembly 502, wherein during working, the two longitudinal beams 102 are first placed in the placing grooves 50231 on the upper ends of the corresponding side longitudinal beam strutting assemblies 502 to realize preliminary positioning, then as shown, Figure 8 The lifting blocks 5027 are lowered and driven to move the strutting blocks 5024 on both sides of the strutting seat 5021 outward by the cooperation of the lower end lifting inclined surface and the strutting inclined surface 50241 to abut against the corresponding side longitudinal beams 102 respectively to complete the horizontal positioning, and the longitudinal beam positioning blocks 5011 in the longitudinal beam pressing assembly 501 are lowered to press the corresponding side longitudinal beams 102 to complete the vertical positioning, the above-mentioned positioning can fully ensure that the positioning of each group of longitudinal beams 102 is accurate, thereby ensuring that the subsequent welding position is accurate.

Claims

1. A welding fixture for a bed frame with longitudinal beams, characterized in that: The positioning frame (601) is provided with a frame positioning assembly (2), a cross beam positioning assembly (3), an intermediate beam positioning assembly (4) and a longitudinal beam positioning mechanism (5), wherein the longitudinal beam positioning mechanism (5) comprises a longitudinal beam pressing assembly (501) and a longitudinal beam strutting assembly (502), the longitudinal beam pressing assembly (501) is provided with a longitudinal beam positioning block (5011) having lifting and rotating degrees of freedom, the longitudinal beam strutting assembly (502) comprises a strutting seat (5021), a strutting mounting seat (5023), a strutting block (5024) and a lifting block (5027), the lower end of the strutting mounting seat (5023) is arranged on the positioning frame (601), the upper end is provided with a placing groove (50231) for placing two longitudinal beams (102), the strutting seat (5021) is arranged in the middle of the placing groove (50231) and between the two longitudinal beams (102), the two sides of the strutting seat (5021) are provided with telescopic strutting blocks (5024), the inside of the strutting seat (5021) is provided with a lifting block (5027), the lower side of the lifting block (5027) is provided with a lifting inclined surface, the inside of the strutting block (5024) is provided with a strutting inclined surface (50241) matched with the lifting inclined surface, the strutting blocks (5024) on the two sides of the strutting seat (5021) are both provided with a tension spring connecting rod (5025), and the tension spring connecting rods (5025) on the same side are connected through a tension spring (5026).

2. The welding fixture for a stringer bed frame of claim 1, wherein: The strutting mounting seat (5023) is provided with a strutting cylinder (5022), and the lifting block (5027) is driven to lift through the strutting cylinder (5022).

3. The welding fixture for a stringer bed frame of claim 1, wherein: The longitudinal beam pressing assembly (501) comprises a pressing mounting seat (5013) and a longitudinal beam positioning driving device (5012), wherein the pressing mounting seat (5013) is arranged on the positioning frame (601), the longitudinal beam positioning driving device (5012) is arranged on the pressing mounting seat (5013), and the longitudinal beam positioning block (5011) is arranged on the longitudinal beam positioning driving device (5012).

4. The welding fixture for a stringer bed frame of claim 1, wherein: The frame positioning assembly (2) and the cross beam positioning assembly (3) are the same in structure, both comprising a positioning mounting seat (204) arranged on the positioning frame (601), and the positioning mounting seat (204) is provided with a pressing block driving device (203), a limiting block (205) and a jacking cylinder (201), the pressing block driving device (203) is provided with a positioning pressing block (202) having lifting and rotating degrees of freedom.

5. The welding fixture for stringer bed frames of claim 1, wherein: The intermediate beam positioning assembly (4) comprises an intermediate beam positioning seat (405) arranged on the positioning frame (601), and the intermediate beam positioning seat (405) is provided with a first positioning cylinder (404), a second positioning cylinder (402), a first limiting seat, a second limiting seat, a first pressing driving device (403) and a second pressing driving device (406), wherein the first pressing driving device (403) is provided with a first positioning block (401) having lifting and rotating degrees of freedom, and the second pressing driving device (406) is provided with a second positioning block (407) having lifting and rotating degrees of freedom.

6. The welding fixture for a stringer bed frame of claim 5, wherein: The intermediate beam assembly (103) in the middle of the bed frame (1) comprises a first intermediate beam (1031) and a second intermediate beam (1032), and the first intermediate beam (1031) is limited in horizontal direction displacement by cooperation of the first positioning cylinder (404) and the first limiting seat, and is limited in vertical direction displacement by pressing of the first positioning block (401), and the second intermediate beam (1032) is limited in horizontal direction displacement by cooperation of the second positioning cylinder (402) and the second limiting seat, and is limited in vertical direction displacement by pressing of the second positioning block (407).

7. The welding fixture for stringer bed frames of claim 1, wherein: The positioning frame (601) is driven to rotate by a turnover mechanism (6), the turnover mechanism (6) comprises a base (605) and turnover support seats (604) arranged at both ends of the base (605), one of the turnover support seats (604) is provided with a turnover motor (602), and the other turnover support seat (604) is provided with a turnover bearing seat (603), both ends of the positioning frame (601) are provided with turnover connecting plates (6011), one end of the turnover connecting plate (6011) of the positioning frame (601) is connected with a power shaft of the turnover motor (602), and the other end of the turnover connecting plate (6011) is provided with a rotating shaft installed in the turnover bearing seat (603).

8. The welding fixture for stringer bed frames of claim 1, wherein: The bed frame (1) to be welded comprises a frame (101), and the middle of the frame (101) is provided with an intermediate beam assembly (103), both sides of the front of the frame (101) are provided with two groups of longitudinal beams (102), and the rear of the frame (101) is provided with a cross beam (104) inside, wherein the frame (101) is fixed by the frame positioning assembly (2), the cross beam (104) is fixed by the cross beam positioning assembly (3), the intermediate beam assembly (103) is fixed by the intermediate beam positioning assembly (4), and the longitudinal beam (102) is positioned by the longitudinal beam positioning mechanism (5).

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