Head adjusting structure of folding bed

Abstract

The utility model belongs to the technical field of folding beds, and particularly relates to a head adjusting structure of a folding bed, which comprises a foldable bed frame, a flexible bed surface is arranged on the bed frame, the bed frame comprises a mounting frame used for mounting the flexible bed surface, a connecting rod extending downwards is fixedly arranged on the mounting frame, a supporting rod is rotatably arranged on the bed frame, and the flexible bed surface is arranged on the supporting rod. The flexible bed surface comprises a main body part connected with the mounting frame and a headrest part connected with the supporting rod, one end of the supporting rod extends towards the upper part of the mounting frame and is connected with the headrest part, the other end of the supporting rod is provided with a first sliding sleeve, the first sliding sleeve is movably connected with the connecting rod, and the connecting rod is provided with a locking piece for controlling the first sliding sleeve and the connecting rod to be relatively fixed; the first sliding sleeve and the connecting rod are controlled to move relatively so that the supporting rod and the bed frame can rotate relatively, and therefore the inclination angle of the headrest part is adjusted, and the head adjusting structure of the folding bed is convenient to adjust and high in comfort.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of folding bed, especially relates to a head adjusting structure of folding bed. BACKGROUND

[0002] The folding bed is also called a lunch bed or a folding deck chair, and is a simple bed which can be folded and unfolded through various folding modes for the convenience and space saving by using the joint principle.

[0003] Some folding beds on the market do not have obvious headrest parts, and users need to use pillows when using. In order to facilitate the use of users, some folding beds are provided with adjustable headrest parts. For example, the folding deck chair bed with a mattress disclosed in Chinese utility model patent CN202222791175.1 includes a bed frame and a mattress. The bed frame includes a head frame, an intermediate frame and a foot rest frame. The two ends of the intermediate frame are hingedly connected with the head frame and the foot rest frame, respectively. The bottom of the intermediate frame and the foot rest frame is hingedly connected with a supporting leg. An angle adjusting mechanism is arranged between the head frame and the intermediate frame. The head frame and the foot rest frame can be folded and attached together with the intermediate frame. A connecting sleeve is arranged on the head frame, the intermediate frame and the foot rest frame. The connecting sleeve is connected to the bottom of the mattress. The connecting part of the connecting sleeve and the mattress deviates from the edge of the bottom of the mattress, so that the edge of the mattress forms a convex edge which can float upward relative to the bed frame. The angle adjusting mechanism includes an angle adjusting frame arranged on the head frame and a clamping piece arranged on the intermediate frame and matched with the angle adjusting frame. The angle adjusting frame can rotate relative to the head frame. A plurality of positions are arranged on the angle adjusting frame. The clamping piece is clamped in one of the positions, so that the head frame can be supported upward and form an angle with the intermediate frame.

[0004] In the above structure, the clamping piece is matched with different positions to adjust the inclination angle of the head frame. However, when the head frame is forced to turn upward, the clamping piece will be separated from the position. Then, the head frame will rotate freely with the intermediate frame and be accidentally turned downward, which can easily cause injury to the user. The user is not convenient to use. According to the lever principle, the inclination angle of the head frame is greatly different when the clamping piece is matched with the adjacent position. The user is difficult to adjust the head frame to the appropriate position, which affects the comfort of the folding bed when used. SUMMARY

[0005] In order to overcome the defects in the prior art, the purpose of the utility model is to provide a head adjusting structure of a folding bed which is convenient to adjust and has high comfort.

[0006] The utility model discloses a head adjusting structure of a folding bed which is convenient to adjust and has high comfort.

[0007] The head adjusting structure of the folding bed comprises a foldable bed frame, a flexible bed surface arranged on the bed frame, and a mounting frame for mounting the flexible bed surface, wherein a downward extending connecting rod is fixedly arranged on the mounting frame, a support rod is rotatably arranged on the bed frame, the flexible bed surface comprises a main body part connected with the mounting frame and a headrest part connected with the support rod, one end of the support rod extends upwards above the mounting frame and is connected with the headrest part, a first sliding sleeve is arranged on the other end of the support rod, the first sliding sleeve is movably connected with the connecting rod, and a locking piece for fixing the first sliding sleeve relative to the connecting rod is arranged on the connecting rod; relative movement of the first sliding sleeve relative to the connecting rod can make the support rod rotate relative to the bed frame, so as to adjust the inclination angle of the headrest part.

[0008] The utility model further sets up: support rod is connected with mounting frame rotatably through hinged rod, and the support rod on one side of hinged rod is bent upwards and forms the support arm, and the support arm is connected with the headrest part.

[0009] The utility model further sets up: the first sliding sleeve is slidably arranged on the connecting rod, a pushing groove is arranged on the support rod, a pushing rod matched with the pushing groove is arranged on the first sliding sleeve, the first sliding sleeve is controlled to slide on the connecting rod, the pushing rod drives the support rod to swing through the pushing groove, and the inclination angle of the headrest part is adjusted.

[0010] The utility model further sets up: a guide hole matched with the connecting rod is arranged on the first sliding sleeve, the locking piece is a spring buckle movably arranged on the connecting rod, the spring buckle is abutted on the guide hole and makes the first sliding sleeve fixed relative to the connecting rod, under the action of external force, the spring buckle can move relative to the first sliding sleeve and makes the first sliding sleeve slide relative to the connecting rod.

[0011] The utility model further sets up: the guide hole is provided with inclined driving surfaces at upper and lower ends respectively, the driving surfaces can abut on the spring buckle and drive the spring buckle to displace, so that the spring buckle can be inserted into the guide hole.

[0012] The utility model further sets up: the locking piece is a clamping rod slidably arranged on the first sliding sleeve, and a spring piece for driving the clamping rod to cooperate with the connecting rod is arranged on the first sliding sleeve; under the action of external force, the clamping rod can move relative to the connecting rod and makes the first sliding sleeve slide relative to the connecting rod.

[0013] The utility model further sets up: the bed frame comprises a plurality of support legs for supporting the mounting frame, a support pad is arranged at the lower end of the connecting rod, the support pad can be flush with the lower end of the support leg, so that the connecting rod can support the mounting frame together with the support leg.

[0014] The utility model further sets up: the support leg includes two X shape linkage link, the installation frame includes a plurality of opposite folding side pole, be provided with connecting seat on the side pole, the link upper end is connected with connecting seat rotation respectively, the support leg is rotationally provided with the second sliding sleeve, the second sliding sleeve is connected with connecting rod sliding, and the connecting rod is provided with the limit block, control bed frame unfolding, the second sliding sleeve can abut on the limit block and make the sliding sleeve and connecting rod relative fixed.

[0015] The utility model further sets up: the headrest part is provided with the first slot, the support rod end is inserted in the first slot, the main part is provided with the second slot in the headrest part one end away, the installation frame is inserted in the second slot in the support rod one end away.

[0016] The utility model further sets up: the bed frame includes two installation frames connected with the main part two sides respectively, two installation frames all are provided with connecting rod and support rod, the support rod between two installation frames is provided with the foldable folding unit, the folding unit includes two X shape linkage link, two link upper side is connected with the installation frame or support rod respectively, the folding unit supports the support rod and avoids the support rod mutual close.

[0017] The utility model has the advantages compared with prior art:

[0018] 1, the utility model discloses a locking piece control first sliding sleeve fixed on the connecting rod different position in, thereby control the inclination angle of support rod, and then adjust the inclination angle of headrest part, simple structure, convenient for user to adjust control, and the structure in support rod and installation frame rotation connection, first sliding sleeve and headrest part are arranged on the upper and lower two sides of installation frame respectively, and this structure can reduce the swing amplitude of headrest part in the first sliding sleeve movement process, is favorable to user and adjusts headrest part to the appropriate position according to the need, is favorable to improve the comfort of folding bed.

[0019] 2, the utility model discloses that the support arm that bends upwards is favorable to headrest part always inclines upwards, thereby increases the maximum inclination angle of headrest part in the use process, convenient for user to use, and the structure of the push groove and the push rod is simple, and convenient for production and processing, and the horizontal displacement in the rotation process of support rod can be made up through the push groove, and the flexible movement of first sliding seat and support rod is convenient.

[0020] 3、The utility model discloses a guide hole's setting is convenient for the stable connection of first sliding sleeve and connecting rod, and the simple structure of elastic buckle is convenient for production and installation, and elastic buckle can be fixed relative to first sliding sleeve and connecting rod through friction or clamping structure, and the inclination angle of support rod is adjusted conveniently for the user, and the user is adjusted and controlled conveniently, and the setting of driving surface is convenient for elastic buckle to be worn into the guide hole, and the connection of elastic buckle and guide hole is matched, and the user is convenient to use, and the simple structure of clamping rod and elastic piece is convenient for production and installation, and clamping rod can be fixed relative to first sliding sleeve and connecting rod through friction or clamping structure, and the inclination angle of support rod is adjusted conveniently for the user, and the user is adjusted and controlled conveniently.

[0021] 4、The utility model discloses a connecting rod can be supported with support leg together to installation frame, which can not only reduce the stress of support leg, avoid the damage of support leg due to excessive stress, but also facilitate the stable installation of connecting rod, avoid the inclination of connecting rod due to excessive stress of support rod, and prolong the service life of folding bed, the setting of connecting seat is conducive to the stable installation of connecting rod and improves the structural strength of folding bed, and the setting of limiting block facilitates the relative positioning of second sliding sleeve and support leg during the unfolding of folding bed, which is conducive to supporting installation frame with connecting rod and support leg together and avoiding the excessive stress of connecting rod due to the suspension of support leg during use.

[0022] 5、The utility model discloses the simple structure of first slot and second slot is convenient for the disassembly and installation of flexible bed surface, and the structure is convenient for the stable installation of flexible bed surface, avoids the disengagement of flexible bed surface and headrest part and mounting hole during use, and the setting of folding unit is convenient for the stable unfolding of folding bed and avoids the traction of two installation frames and support rod by flexible bed surface during use. ACCURACY OF DRAWINGS

[0023] Figure 1 It is one of the use state diagrams of example one in the utility model;

[0024] Figure 2 It is the second use state diagram of example one in the utility model;

[0025] Figure 3 It is the explosion schematic view of bed frame in example one of the utility model;

[0026] Figure 4 It is the partial sectional view of example one in the utility model;

[0027] Figure 5 It is the structural schematic view of support leg in example one of the utility model;

[0028] Figure 6 It is the structural schematic view of installation frame in example one of the utility model;

[0029] Figure 7is a structural schematic view of the flexible bed surface in the embodiment one of the utility model;

[0030] Figure 8 is a structural schematic view two of the flexible bed surface in the embodiment one of the utility model;

[0031] Figure 9 is a structural schematic view of the connecting rod in the embodiment one of the utility model;

[0032] Figure 10 is a structural schematic view of the support rod in the embodiment one of the utility model;

[0033] Figure 11 is a structural schematic view of the first sliding sleeve in the embodiment one of the utility model;

[0034] Figure 12 is a partial sectional view of the embodiment two in the utility model;

[0035] Figure 13 is a structural schematic view of the first sliding sleeve in the embodiment two of the utility model.

[0036] The meaning of the reference numeral in the drawing: 1-bed frame;11-support leg;12-mounting frame;13-folding unit;14-second sliding sleeve;111-rod body;121-side rod;122-connection seat;2-flexible bed surface;21-main body part;22-headrest part;23-second slot;24-first slot;3-connecting rod;31-support pad;32-limiting block;33-snap buckle;34-positioning groove;4-support rod;41-driving part;42-support arm;43-hinge rod;44-pull slot;5-first sliding sleeve;51-guide hole;52-clamping slot;53-driving surface;54-pull rod;55-sliding slot;

[0037] 56-elastic member;57-clamping rod;521-tapered side wall;561-constricted opening. DETAILED DESCRIPTION

[0038] The utility model will be further described in conjunction with the specific embodiment with the accompanying drawings:

[0039] Referring to Figures 1 to 13As shown, a head adjusting structure of a folding bed, comprising a foldable bed frame 1, a flexible bed surface 2 is arranged on the bed frame 1, the bed frame 1 comprises a mounting frame 12 for mounting the flexible bed surface 2, a connecting rod 3 extending downward is fixedly arranged on the mounting frame 12, a support rod 4 is rotatably arranged on the bed frame 1, the flexible bed surface 2 comprises a main body part 21 connected with the mounting frame 12 and a headrest part 22 connected with the support rod 4, one end of the support rod 4 extends above the mounting frame 12 and is connected with the headrest part 22, a first sliding sleeve 5 is arranged on the other end of the support rod 4, the first sliding sleeve 5 is movably connected with the connecting rod 3, and a locking piece for fixing the first sliding sleeve 5 relative to the connecting rod 3 is arranged on the connecting rod 3; the relative movement of the first sliding sleeve 5 and the connecting rod 3 can make the support rod 4 rotate relative to the bed frame 1, so as to adjust the inclination angle of the headrest part 22, in the structure, the locking piece controls the first sliding sleeve 5 to be fixed at different positions on the connecting rod 3, so as to control the inclination of the support rod 4 to be large, and then adjust the inclination angle of the headrest part 22, the structure is simple, and it is convenient for users to adjust and control, and in the structure, the support rod 4 is rotatably connected with the mounting frame 12, the first sliding sleeve 5 and the headrest part 22 are arranged on the upper and lower sides of the mounting frame 12 respectively, the structure can reduce the swing amplitude of the headrest part 22 in the movement process of the first sliding sleeve 5, which is beneficial to adjusting the headrest part 22 to a suitable position according to the needs of users, and is beneficial to improving the comfort of the folding bed.

[0040] The locking piece can be fixed on the connecting rod 3 through a hoop structure, and the locking piece can also be directly fixed on the connecting rod 3 through a clamping structure or other fasteners, and the following two embodiments are shown in the utility model:

[0041] Embodiment one

[0042] In the embodiment, a guide hole 51 adapted to the connecting rod 3 is arranged on the first sliding sleeve 5, the locking piece is a spring buckle 33 movably arranged on the connecting rod 3, the spring buckle 33 abuts against the guide hole 51 and fixes the first sliding sleeve 5 relative to the connecting rod 3, under the action of external force, the spring buckle 33 can move relative to the first sliding sleeve 5 and make the first sliding sleeve 5 slide relative to the connecting rod 3, the arrangement of the guide hole 51 facilitates the stable connection of the first sliding sleeve 5 and the connecting rod 3, the structure of the spring buckle 33 is simple, convenient for production and installation, the spring buckle 33 can make the first sliding sleeve 5 fixed relative to the connecting rod 3 through friction or clamping structure, which is convenient for users to adjust the inclination angle of the support rod 4 and convenient for users to adjust and control.

[0043] Inclined driving surfaces 53 are arranged on the upper and lower ends of the guide hole 51 respectively, the driving surfaces 53 can abut against the spring buckle 33 and drive the spring buckle 33 to displace, so that the spring buckle 33 can penetrate into the guide hole 51, the arrangement of the driving surfaces 53 facilitates the penetration of the spring buckle 33 into the guide hole 51 and the connection and cooperation of the spring buckle 33 and the guide hole 51, in the process, the user does not need to control the displacement of the spring buckle 33, which is convenient for the user to use.

[0044] The elastic buckle 33 can directly abut against the guide hole 51, and the first sliding sleeve 5 is relatively fixed with the connecting rod 3 through the friction between the elastic buckle 33 and the guide hole 51. In the embodiment, preferably, at least two locking members are arranged in the extending direction of the connecting rod 3, the locking member is the elastic buckle 33 movably arranged on the connecting rod 3, and the first sliding sleeve 5 is provided with a clamping groove 52 matched with the elastic buckle 33. Under the action of an external force, the elastic buckle 33 can be separated from the clamping groove 52, so that the first sliding sleeve 5 can slide relative to the connecting rod 3. The elastic buckle 33 has a simple structure, is convenient to produce and install, and is convenient for the cooperation and separation of the first sliding sleeve 5 and the locking member, so as to be convenient for the user to adjust the inclination angle of the supporting rod 4 and be convenient for the user to adjust and control.

[0045] In the embodiment, the clamping groove 52 is arranged on the side wall of the guide hole 51, and the clamping groove 52 is provided with a tapered side wall 521 close to one end of the guide hole 51. The tapered side wall 521 can guide the elastic buckle 33 and make the elastic buckle 33 quickly cooperate with the clamping groove 52.

[0046] Embodiment two

[0047] The locking member is a clamping rod 57 movably arranged on the first sliding sleeve 5, and the first sliding sleeve 5 is provided with an elastic member 56 for driving the clamping rod 57 to cooperate with the connecting rod 3. Under the action of an external force, the clamping rod 57 can move relative to the connecting rod 3 and make the first sliding sleeve 5 slide relative to the connecting rod 3. The clamping rod 57 and the elastic member 56 have a simple structure, are convenient to produce and install, the clamping rod 57 can relatively fix the first sliding sleeve 5 and the connecting rod 3 through friction or clamping structure, and it is convenient for the user to adjust the inclination angle of the supporting rod 4 and be convenient for the user to adjust and control.

[0048] The clamping rod 57 can directly abut against the connecting rod 3, and the first sliding sleeve 5 is relatively fixed with the connecting rod 3 through the friction between the clamping rod 57 and the connecting rod 3. In the embodiment, preferably, at least two positioning grooves 34 are arranged in the extending direction of the connecting rod 3, the locking member is the clamping rod 57 movably arranged on the first sliding sleeve 5, and the first sliding sleeve 5 is provided with an elastic member 56 for driving the clamping rod 57 to cooperate with the positioning groove 34. The inclination angle of the clamping rod 57 and the headrest part 22 is different when the clamping rod 57 cooperates with different positioning grooves 34. Under the action of an external force, the clamping rod 57 can be separated from the positioning groove 34. The clamping rod 57 and the elastic member 56 have a simple structure, are convenient to produce and install, and the structure is conducive to reducing the number of locking members and facilitating assembly and production.

[0049] In the embodiment, the first sliding sleeve 5 is provided with a sliding groove 55, the clamping rod 57 is movably arranged in the sliding groove 55, one end of the sliding groove 55 is provided with a necked portion 561 communicated with the guide hole 51, the clamping rod 57 penetrates into the guide hole 51 from the necked portion 561 and cooperates with the positioning groove 34, and the necked portion 561 can avoid the clamping rod 57 from separating from the sliding groove 55 through the necked portion 561.

[0050] The two embodiments above are relatively fixed by the clamping structure of the connecting rod 3 and the first sliding sleeve 5, and the main difference is that the locking member is arranged on the connecting rod 3 or the first sliding sleeve 5.

[0051] The support rod 4 is rotatably connected with the mounting frame 12 through the hinge rod 43, the support rod 4 on one side of the hinge rod 43 is upwardly bent to form the support arm 42, and the support arm 42 is connected with the headrest part 22.

[0052] The first sliding sleeve 5 is slidably arranged on the connecting rod 3, the support rod 4 is provided with a pushing groove 44, the first sliding sleeve 5 is provided with a pushing rod 54 matched with the pushing groove 44, the first sliding sleeve 5 is controlled to slide on the connecting rod 3, the pushing rod 54 drives the support rod 4 to swing through the pushing groove 44, so that the inclination angle of the headrest part 22 is adjusted, the structure of the pushing groove 44 and the pushing rod 54 is simple, production and processing are facilitated, and the horizontal displacement of the support rod 4 during rotation can be compensated through the pushing groove 44, so that flexible movement of the first sliding seat and the support rod 4 is facilitated.

[0053] The support rod 4 is rotatably connected with the mounting frame 12 through the hinge rod 43, the support rod 4 on one side of the hinge rod 43 is upwardly bent to form the support arm 42, and the support arm 42 is connected with the headrest part 22.

[0054] The bed frame 1 comprises a plurality of support legs 11 for supporting the mounting frame 12, the lower end of the connecting rod 3 is provided with a support pad 31, the support pad 31 is flush with the lower end of the support leg 11, so that the connecting rod 3 can support the mounting frame 12 together with the support leg 11, since the connecting rod 3 can support the mounting frame 12 together with the support leg 11, the stress on the support leg 11 can be reduced, damage of the support leg 11 due to excessive stress can be avoided, the structure is conducive to stable installation of the connecting rod 3, excessive stress on the support rod 4 does not cause the connecting rod 3 to tilt, and the service life of the folding bed is prolonged.

[0055] The utility model discloses a support leg 11 includes two articulated X-shaped rod body 111, the installation frame 12 includes a plurality of opposite folding side pole 121, is provided with the connecting seat 122 on the side pole 121, the upper end of rod body 111 is rotatedly connected with connecting seat 122, the second sliding sleeve 14 is rotationally arranged on the support leg 11, and the second sliding sleeve 14 is slidably connected with connecting rod 3, and the connecting rod 3 is provided with the limiting block 32, the control bed frame 1 is unfolded, and the second sliding sleeve 14 can abut on the limiting block 32 and make the sliding sleeve and connecting rod 3 relative fixation, and the setting of connecting seat 122 is favorable to the stable installation of connecting rod 3, and the structural strength of folding bed is improved, and the setting of limiting block 32 is convenient for the relative positioning of second sliding sleeve 14 and support leg 11 in the unfolding process of folding bed, and it is favorable to make connecting rod 3 and support leg 11 support installation frame 12 together, avoid that support leg 11 is suspended in the use process and causes the excessive force of connecting rod 3.

[0056] The headrest part 22 is provided with the first slot 24, the support rod 4 end is inserted in the first slot 24, the main body part 21 is provided with the second slot 23 away from the headrest part 22 one end, and the installation frame 12 is inserted in the second slot 23 away from the support rod 4 one end, and the first slot 24 and the second slot 23 are simple in structure, convenient for the disassembly and installation of flexible bed surface 2, and the structure is convenient for the stable installation of flexible bed surface 2, avoids that flexible bed surface 2 is separated from the headrest part 22 and the mounting hole in the use process.

[0057] The utility model discloses a bed frame 1 includes two installation frames 12 connected with the both sides of main body part 21 respectively, and the connecting rod 3 and the support rod 4 are all set up on the two installation frames 12, and the folding unit 13 that can be folded is set up between the support rod 4 of two installation frames 12, and the folding unit 13 includes two articulated X-shaped connecting rods, and the upper side of two connecting rods is connected with installation frame 12 or support rod 4 respectively, and the folding unit 13 supports support rod 4 and avoids that support rod 4 is close to each other, and the setting of folding unit 13 is convenient for the stable unfolding of folding bed, avoids that flexible bed surface 2 is close to each other with two installation frames 12 and support rod 4 in the use process, and a plurality of connecting rods 3 are set up between two installation frames 12, and the connecting rod 3 is spaced and avoids that the various parts of installation frame 12 are close to each other.

[0058] The above embodiment is only the preferable embodiment of the utility model, and does not limit the protection scope of the utility model, so: all equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A head adjusting structure of a folding bed, comprising a foldable bed frame (1) provided with a flexible bed surface (2), characterized in that: The bedstead (1) comprises a mounting frame (12) for mounting a flexible bed surface (2), a connecting rod (3) downwardly extending is fixedly arranged on the mounting frame (12), a support rod (4) is rotatably arranged on the bedstead (1), the flexible bed surface (2) comprises a main body (21) connected with the mounting frame (12) and a headrest (22) connected with the support rod (4), one end of the support rod (4) extends upwards of the mounting frame (12) and is connected with the headrest (22), the other end of the support rod (4) is provided with a first sliding sleeve (5), the first sliding sleeve (5) is movably connected with the connecting rod (3), and the connecting rod (3) or the first sliding sleeve (5) is provided with a locking piece for controlling the relative fixing of the first sliding sleeve (5) and the connecting rod (3); the relative movement of the first sliding sleeve (5) and the connecting rod (3) can make the support rod (4) relatively rotate with the bedstead (1), so as to adjust the inclination angle of the headrest (22).

2. The head adjustment structure of a folding bed according to claim 1, wherein: The support rod (4) is rotatably connected with the mounting frame (12) through a hinge rod (43), one side of the hinge rod (43) is bent upwards to form a support arm (42), and the support arm (42) is connected with the headrest (22).

3. The head adjustment structure of a folding bed according to claim 1, wherein: The first sliding sleeve (5) is slidably arranged on the connecting rod (3), the support rod (4) is provided with a pushing groove (44), the first sliding sleeve (5) is provided with a pushing rod (54) matched with the pushing groove (44), the sliding of the first sliding sleeve (5) on the connecting rod (3) is controlled, the pushing rod (54) drives the support rod (4) to swing through the pushing groove (44), and the inclination angle of the headrest (22) is adjusted.

4. The head adjustment structure of a foldable bed according to claim 1, wherein: The first sliding sleeve (5) is provided with a guide hole (51) matched with the connecting rod (3), and the locking piece is a spring buckle (33) movably arranged on the connecting rod (3); the spring buckle (33) abuts against the guide hole (51) and relatively fixes the first sliding sleeve (5) and the connecting rod (3); under the action of an external force, the spring buckle (33) can relatively move with the first sliding sleeve (5) and relatively slide the first sliding sleeve (5) and the connecting rod (3).

5. The head adjustment structure of a folding bed according to claim 4, wherein: The guide hole (51) is provided with inclined driving surfaces (53) at the upper end and the lower end respectively, the driving surfaces (53) can abut against the spring buckle (33) and drive the spring buckle (33) to displace, so that the spring buckle (33) can be inserted into the guide hole (51).

6. The head adjustment structure of a foldable bed according to claim 1, wherein: The locking piece is a clamping rod (57) slidably arranged on the first sliding sleeve (5), and the first sliding sleeve (5) is provided with an elastic piece (56) for driving the clamping rod (57) to cooperate with the connecting rod (3); under the action of an external force, the clamping rod (57) can relatively move with the connecting rod (3) and relatively slide the first sliding sleeve (5) and the connecting rod (3).

7. The head adjustment structure of a folding bed according to claim 1, wherein: The bedstead (1) comprises a plurality of support legs (11) for supporting the mounting frame (12), the lower end of the connecting rod (3) is provided with a support pad (31), the support pad (31) can be flush with the lower end of the support leg (11), so that the connecting rod (3) can support the mounting frame (12) together with the support leg (11).

8. The head adjustment structure of a folding bed according to claim 7, wherein: The support leg (11) comprises two X-shaped hinged rods (111), the mounting frame (12) comprises a plurality of foldable side rods (121), the side rods (121) are provided with connecting seats (122), the upper ends of the rods (111) are rotatably connected with the connecting seats (122), the support leg (11) is rotatably provided with a second sliding sleeve (14), the second sliding sleeve (14) is slidably connected with the connecting rod (3), and the connecting rod (3) is provided with a limiting block (32); when the control bed frame (1) is unfolded, the second sliding sleeve (14) can abut against the limiting block (32) and make the sliding sleeve and the connecting rod (3) relatively fixed.

9. The head adjustment structure of a foldable bed according to claim 1, wherein: The headrest part (22) is provided with a first insertion groove (24), the support rod (4) is inserted into the first insertion groove (24), the main body part (21) is provided with a second insertion groove (23) at an end away from the headrest part (22), and the mounting frame (12) is inserted into the second insertion groove (23) at an end away from the support rod (4).

10. The head adjustment structure of a folding bed according to claim 1, wherein: The bed frame (1) comprises two mounting frames (12) connected with two sides of the main body part (21) respectively, the mounting frames (12) are provided with the connecting rod (3) and the support rod (4), the support rods (4) on the two mounting frames (12) are provided with a foldable folding unit (13) between the two support rods (4), the folding unit (13) comprises two X-shaped hinged connecting rods, the upper sides of the two connecting rods are connected with the mounting frames (12) or the support rods (4) respectively, and the folding unit (13) supports the support rods (4) and avoids the support rods (4) from approaching each other.

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