Camping car with stable structure

Abstract

The invention belongs to the technical field of camping cars, and particularly relates to a stable-structure camping car which comprises a car body and wheels, a bottom frame is arranged at the bottom of the car body, foldable end frames are arranged at the front end and the rear end of the car body, a pull rod is movably arranged on one end frame, vertical rods are arranged on the two sides of the end frame respectively, and the bottom frame comprises two first folding units. Each first folding unit comprises a connecting seat, two first supporting connecting rods and two second supporting connecting rods are arranged on the lower side of the connecting seat, the two first supporting connecting rods are rotationally connected with the vertical rod, pull rods are arranged on the two second supporting connecting rods, and the second supporting connecting rods on the two first folding units intersect with each other to form an X shape; pull rods connected with the first folding units are arranged on the side frames, guide sleeves are arranged on the pull rods in a sliding mode, the guide sleeves are rotationally connected with the second supporting connecting rods, and the side frames can pull the second supporting connecting rods through the pull rods and the guide sleeves.

Description

Technical Field

[0001] The invention belongs to the technical field of camping vehicles, and in particular relates to a camping vehicle with a stable structure. Background Art

[0002] A camper, also called a camping car, is a common means of transportation for people during outdoor activities. It has a simple structure and is easy to fold and store, so more and more people are using campers in outdoor activities.

[0003] Most campers on the market include a body, on which a pull rod and a wheel assembly are provided. In order to fully fold the body, the bottom and sides of the body can be folded, such as the fully foldable camper disclosed in Chinese invention patent CN 202220176947.8, which includes a pull rod, a frame, and wheels. The frame is divided into a base frame, a front and rear frame, and a side frame. The side frame includes: a vertical support rod, a first oblique beam, a folding beam, a second oblique beam, and a connecting rod. Two vertical support rods are used, and both vertical support rods are equipped with a fixed seat and a lifting seat. The fixed seat is fixed to the top of the vertical support rod, and the lifting seat is slidably mounted on the vertical support rod; the two first oblique beams are respectively rotatably mounted on the two lifting seats; the two ends of the folding beam are respectively rotatably connected to a first oblique beam; one end of the two second oblique beams is respectively rotatably mounted on the two fixed seats, and the two second oblique beams are rotated on the same base, and the second oblique beams are cross-rotatably connected to the first oblique beam; the ends of the connecting rod are respectively rotatably mounted on the second oblique beam and the folding beam; the base frame includes The invention comprises a central seat and a bottom rod, the end of the bottom rod is rotatably connected to the central seat so that the bottom rods are radially arranged with the central seat as the center, and the bottom rod is divided into a fixed rod and a telescopic rod, the two ends of the fixed rod are rotatably connected to the central seat and the bottom ends of the vertical support rods respectively, and the two ends of the telescopic rod are rotatably connected to the central seat and the base respectively; two central seats are adopted, and four fixed rods and four telescopic rods are adopted respectively, and two fixed rods and two telescopic rods are rotatably installed on each central seat respectively, and articles are carried by two central seats and the bottom rod, and the bottom rod is connected to the side frame through the base, which is beneficial to improve the stability of the base frame installation, and the structure can shorten the length of the bottom rod to avoid the bottom rod being too long and bent and damaged.

[0004] In the above structure, if the articles in the vehicle body are only placed on a central seat and a bottom bar connected to the central seat, the bottom frame is easily deformed, and the bottom bar is easily damaged by excessive force, which affects the service life of the camper. Summary of the invention

[0005] In order to overcome the defects in the prior art, an object of the present invention is to provide a camper with a long service life and a stable structure.

[0006] The object of the present invention is achieved in that:

[0007] A camping vehicle with a stable structure comprises a vehicle body and wheels, a bottom frame is arranged at the bottom of the vehicle body, foldable end frames are arranged at the front and rear ends of the vehicle body, a pull rod is movably arranged on one end frame, vertical poles are arranged on both sides of the end frame, foldable side frames are arranged on the left and right sides of the vehicle body, and the two ends of the side frames are respectively connected to the vertical poles on the two end frames, the bottom frame comprises two groups of first folding units, the two groups of first folding units are respectively connected to the two end frames, the first folding unit comprises a connecting seat, two first supporting links and two second supporting links are rotatably arranged on the lower side of the connecting seat, the two first supporting links are respectively rotatably connected to the vertical poles on both sides of the end frames, and the second supporting links on the two first folding units cross each other to form an X shape, so that one first folding unit can support another first folding unit;

[0008] The side frames are provided with pull rods respectively connected with the first folding units, the pull rods are slidably provided with guide sleeves, the guide sleeves are rotatably connected with the second supporting connecting rods, and the side frames can pull the second supporting connecting rods through the pull rods and the guide sleeves.

[0009] The present invention is further configured as follows: the middle portion of the second support link is bent downward and a swing groove is formed on the upper side of the second support link; the second support link on another first folding unit passes through the swing groove and is connected to the pull rod; the swing groove can support the second support link.

[0010] The present invention is further configured as follows: the side frame includes two groups of second folding units, the second folding units include two second connecting rods hinged in an X shape, the two second connecting rods on the two groups of second folding units are rotatably connected respectively, a sliding sleeve is slidably provided on the pull rod, the pull rod is rotatably connected to a second connecting rod on the second folding unit, the sliding sleeve is rotatably connected to another second connecting rod on the second folding unit, and the two second connecting rods, the sliding sleeve and the pull rod are combined to form a four-bar slider mechanism.

[0011] The present invention is further configured as follows: a sliding hole adapted to the pull rod is provided in the sliding sleeve, a through hole and a countersunk hole are provided on the side wall of the sliding hole, the countersunk hole is provided in the extension direction of the through hole, the fastener can pass through the through hole and be installed in the countersunk hole, so that the fastener rotatably connects the sliding sleeve with the second connecting rod.

[0012] The present invention is further configured as follows: the sliding sleeve comprises two sleeves which are spaced apart from each other, the two sleeves are fixedly connected via a fixing rod, and the sleeves are respectively slidably connected to the pull rods.

[0013] The present invention is further configured such that: the pull rod is arranged vertically, and the two second connecting rods on the second folding unit and the pull rod are distributed in an isosceles triangle, thereby preventing the pull rod from swinging to both sides during the unfolding or folding process of the two second connecting rods on the second folding unit.

[0014] The present invention is further configured as follows: the end frame includes a third folding unit arranged between the vertical poles, a sliding sleeve is slidably arranged on the vertical poles, the third folding unit includes two third connecting rods hinged in an X shape, one third connecting rod is rotatably connected to the vertical pole, the other third connecting rod is rotatably connected to the sliding sleeve, and a second connecting rod in the second folding unit is rotatably connected to the vertical pole, the sliding sleeve can drive the other second connecting rod in the second folding unit to move, so that the second folding unit and the third folding unit can be folded synchronously.

[0015] The present invention is further configured as follows: the end frame includes two groups of third folding units, the two third connecting rods on the two groups of third folding units are rotatably connected respectively, the two vertical poles are provided with a first hinge groove, the sliding sleeve is provided with a second hinge groove adapted to the second connecting rod, and the two third connecting rods on one group of third folding units are bent relative to each other, so that the first hinge grooves on the two vertical poles are arranged relative to each other, and the second hinge grooves on the sliding sleeves on the two vertical poles are arranged relative to each other.

[0016] The present invention is further configured as follows: two auxiliary connecting rods are rotatably provided on the sliding sleeve, and the two auxiliary connecting rods are rotatably connected to the two second connecting rods in the second folding unit respectively to form a four-bar mechanism.

[0017] The present invention is further configured as follows: a receiving groove is provided in the connecting seat, and a traction portion is provided in the receiving groove, and the connecting seat can be pulled to move upward by the traction portion, so that the first folding unit is relatively folded.

[0018] The advantages of the present invention compared with the prior art are:

[0019] 1. In the present invention, since the second supporting links on the two first folding units cross each other to form an X shape, when a heavy object is placed on the chassis, the second supporting links on the two groups of first folding units can enable the two first folding units to support each other, which is beneficial to improving the stability of the chassis structure and avoiding the mass of the heavy object being concentrated on one first folding unit during use, which may cause damage to the first folding unit. In addition, the second supporting links that cross each other in the structure can cause force to be applied to the middle part of the second supporting links, which can avoid bending and damage of the second supporting links due to excessive length, which is beneficial to extending the service life of the camper. The pull rods arranged on the side frames can respectively pull and support the two groups of first folding units, which is beneficial to dispersing the force on the side frames. In addition, the structure disperses the supporting points of the chassis, which is beneficial to improving the stability of the chassis installation. The arrangement of the guide sleeve facilitates the flexible connection between the chassis and the pull rod, which is convenient for the unfolding and folding of the camper and convenient for users to use.

[0020] 2. The production error and installation error in the present invention may easily lead to uneven expansion and contraction of the base frame and the side frame. If the second supporting link is directly connected to the pull rod for rotation, it may easily cause the camper to get stuck during expansion and contraction during use. The setting of the guide sleeve facilitates the flexible connection between the base frame and the pull rod, facilitates the expansion and folding of the camper, and is convenient for users to use. The structure that bends downward to form a swing groove facilitates the production and processing of the second supporting link, and the setting of the swing groove is conducive to reducing the height difference between the upper ends of the two first folding units, thereby improving the flatness of the bottom of the vehicle body, facilitating the stable placement of items in the vehicle body, and making it convenient for users to use.

[0021] 3. The through holes and countersunk holes on the side walls of the sliding hole in the present invention make it easy for the manufacturer to rotatably connect the sliding sleeve and the second connecting rod through fasteners, which is convenient for the stable installation of the sliding sleeve and the second connecting rod and convenient for the assembly and production of the camper; the two sleeves arranged at intervals are convenient for the stable connection between the sliding sleeve and the pull rod, reducing deflection or shaking during use, which is conducive to the stable sliding of the sliding sleeve on the pull rod; because the two second connecting rods and the pull rod are distributed in an isosceles triangle, the pull rod is prevented from being deflected during the unfolding or folding of the camper, which affects the unfolding or folding of the camper, and facilitates the unfolding and folding of the camper and the use of the user.

[0022] 4. The arrangement of the sliding sleeve in the present invention facilitates the synchronous folding of the second folding unit and the third folding unit, facilitates the unfolding and folding of the camper, and is convenient for users; the relatively bent third connecting rod facilitates the relative arrangement of the first hinge groove and the second hinge groove on both sides of the end frame, respectively, which is convenient for manufacturers to assemble the camper, and this structure is beneficial to reducing the types of parts of the camper, and is beneficial to reducing the types of molds for the camper, thereby reducing the production cost of the camper; the arrangement of the two auxiliary connecting rods facilitates the flexible unfolding and folding of the second folding unit, reduces the jamming of the second folding unit during use, facilitates the unfolding and folding of the camper, and is convenient for users.

[0023] 5. The setting of the traction part in the present invention facilitates the user to quickly control the folding of the chassis, which is convenient for the user to use, and the setting of the storage groove facilitates the hidden storage of the traction part, avoiding the traction part protruding from the top of the chassis to affect the user's placement of items in the camper. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 It is a folded state diagram of the present invention;

[0026] Figure 3 is an exploded schematic diagram of a vehicle body in the present invention;

[0027] Figure 4 is a schematic structural diagram of the first folding unit in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the connecting seat in the present invention;

[0029] Figure 6 It is a structural schematic diagram of the guide sleeve in the present invention;

[0030] Figure 7 is a schematic structural diagram of the second folding unit in the present invention;

[0031] Figure 8 It is a structural schematic diagram of the end frame of the present invention;

[0032] Fig. 9 is a schematic structural diagram of the third folding unit in the present invention;

[0033] Fig.10 It is a structural schematic diagram of the pull rod in the present invention;

[0034] Fig.11 It is a cross-sectional view of the sliding sleeve in the present invention.

[0035] Meanings of the reference numerals in the figure: 1- bottom frame; 11- first folding unit; 111- connecting seat; 112- first supporting link; 113- second supporting link; 114- swinging groove; 115- traction part; 116- guide sleeve; 117- guide hole; 118- supporting wall; 119- storage groove; 1111- movable groove; 1112- abutting wall; 2- side frame;

[0036] 21-second folding unit; 211-second connecting rod; 212-auxiliary connecting rod; 213-first hinge hole;

[0037] 214-second hinge hole; 3-end frame; 31-third folding unit; 32-vertical pole; 33-sliding sleeve;

[0038] 311 - third connecting rod; 321 - upper connecting end; 322 - first hinge groove; 323 - third hinge groove;

[0039] 324-lower connecting end; 325-connecting groove; 331-second hinge groove; 332-fourth hinge groove; 4-pull rod; 41-rod body; 42-limiting sleeve; 43-third hinge hole; 5-sliding sleeve; 51-sleeve; 52-fixing rod; 53-sliding hole; 54-through hole; 55-countersunk hole. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to specific embodiments of the present invention:

[0041] See also Figures 1 to 11As shown, a camping vehicle with a stable structure includes a vehicle body and wheels, a base frame 1 is arranged at the bottom of the vehicle body, foldable end frames 3 are arranged at the front and rear ends of the vehicle body, a pull rod is movably arranged on one end frame 3, vertical poles 32 are respectively arranged on both sides of the end frame 3, and foldable side frames 2 are respectively arranged on the left and right sides of the vehicle body, and the two ends of the side frames 2 are respectively connected to the vertical poles 32 on the two end frames 3. The base frame 1 includes two groups of first folding units 11, and the two groups of first folding units 11 are respectively connected to the two end frames 3. The first folding unit 11 includes a connecting seat 111, and two first supporting links 112 and two second supporting links 113 are rotatably arranged on the lower side of the connecting seat 111. The two first supporting links 112 are respectively rotatably connected to the vertical poles 32 on both sides of the end frames 3, and the two second supporting links 113 are respectively movably arranged with pull rods 4, and the second supporting links 113 on the two first folding units 11 cross each other to form an X shape, so that one first folding unit 11 can support another first folding unit 11;

[0042] The side frame 2 includes two groups of second folding units 21, and the second folding units 21 include two second connecting rods 211 hinged in an X shape. The two second connecting rods 211 on the two groups of second folding units 21 are rotatably connected respectively. A sliding sleeve 5 is slidably provided on the pull rod 4. The pull rod 4 is rotatably connected to a second connecting rod 211 on the second folding unit 21, and the sliding sleeve 5 is rotatably connected to another second connecting rod 211 on the second folding unit 21. The two second connecting rods 211, the sliding sleeve 5 and the pull rod 4 are combined to form a four-bar slider mechanism.

[0043] In the above structure, since the second supporting links 113 on the two first folding units 11 cross each other to form an X shape, when a heavy object is placed on the base frame 1, the second supporting links 113 on the two groups of first folding units 11 can make the two first folding units 11 support each other, which is beneficial to improving the stability of the base frame 1 structure and avoiding the mass of the heavy object being concentrated on one first folding unit 11 during use, which may cause damage to the first folding unit 11. In addition, the cross-crossed second supporting links 113 in the structure can cause the middle part of the second supporting links 113 to be stressed, avoiding the second supporting links 113 being bent and damaged due to excessive length, which is beneficial to extending the service life of the camper.

[0044] In the present invention, the middle part of the second support link 113 is bent downward and a swing groove 114 is formed on the upper side of the second support link 113. The second support link 113 on the other first folding unit passes through the swing groove 114 and is connected to the pull rod 4. The swing groove 114 can support the second support link 113. The structure of bending downward to form the swing groove 114 is convenient for the production and processing of the second support link 113, and the setting of the swing groove 114 is conducive to reducing the height difference between the upper ends of the two first folding units 11, thereby improving the flatness of the bottom of the vehicle body, facilitating the stable placement of items in the vehicle body, and facilitating use by users.

[0045] In this embodiment, a swing groove 114 is provided on the upper side of another second support link 113 located below the second support link 113. During actual assembly and production, the two second support links 113 on the same first folding unit 11 may be provided with the swing groove 114, or a second support link 113 with a swing groove 114 may be provided on each of the two first folding units 11. In the drawings of the specification of the present invention, the two second support links 113 on the same first folding unit 11 are provided with the swing groove 114.

[0046] Production errors and installation errors can easily lead to uneven extension and retraction of the base frame 1 and the side frame 2. If the second supporting link 113 is directly rotatably connected to the pull rod 4, it may easily cause the camper to get stuck during expansion and contraction during use. Preferably, a guide sleeve 116 is slidably provided on the pull rod 4, and the guide sleeve 116 is adapted to a guide hole 117 of the side frame 2. The guide sleeve 116 is rotatably connected to the second supporting link 113, and a supporting wall 118 for supporting the second supporting link 113 is provided on the guide sleeve 116. The provision of the guide sleeve 116 facilitates the flexible connection between the base frame 1 and the pull rod 4, facilitates the expansion and folding of the camper, and is convenient for users.

[0047] The pull rod 4 in this embodiment includes a rod body 41, a guide sleeve 116 is slidably arranged on the rod body 41, and a limiting sleeve 42 is fixedly arranged at the lower end of the rod body 41. The limiting sleeve 42 can prevent the guide sleeve 116 from detaching from the rod body 41, and the limiting sleeve 42 can support the guide sleeve 116.

[0048] The sliding sleeve 5 is provided with a sliding hole 53 adapted to the pull rod 4, and the side wall of the sliding hole 53 is provided with a through hole 54 and a countersunk hole 55. The countersunk hole 55 is arranged in the extension direction of the through hole 54. The fastener can pass through the through hole 54 and be installed in the countersunk hole 55, so that the fastener can rotatably connect the sliding sleeve 5 with the second connecting rod 211. The through hole 54 and the countersunk hole 55 on the side wall of the sliding hole 53 are convenient for the manufacturer to rotatably connect the sliding sleeve 5 with the second connecting rod 211 through the fastener, which is convenient for the stable installation of the sliding sleeve 5 and the second connecting rod 211 and the assembly and production of the camper.

[0049] The sliding sleeve 5 described in the present invention includes two sleeves 51 arranged at intervals, and the two sleeves 51 are fixedly connected by a fixing rod 52. The sleeves 51 are respectively slidably connected to the pull rod 4. The two sleeves 51 arranged at intervals facilitate the stable connection between the sliding sleeve 5 and the pull rod 4, reduce deflection or shaking during use, and are conducive to the stable sliding of the sliding sleeve 5 on the pull rod 4.

[0050] The pull rod 4 described in this embodiment is arranged vertically, and the two second connecting rods 211 on the second folding unit 21 are distributed in an isosceles triangle with the pull rod 4, thereby preventing the pull rod 4 from swinging to both sides during the unfolding or folding of the two second connecting rods 211 on the second folding unit 21. This structure can prevent the pull rod 4 from being deflected during the unfolding or folding of the camper and affecting the unfolding or folding of the camper, thereby facilitating the unfolding and folding of the camper and making it easier for users to use.

[0051] A third hinge hole 43 is provided on the upper part of the rod body 41, a first hinge hole 213 is provided on a second connecting rod 211, and a second hinge hole 214 is provided on the other second connecting rod 211. The first hinge hole 213 and the second hinge hole 214 are vertically distributed, and the second hinge hole 214 is provided between the first hinge hole 213 and the limiting sleeve 42. The fastener passes through the first hinge hole 213 and the third hinge hole 43 and rotationally connects the pull rod 4 with the second connecting rod 211. The fastener passes through the countersunk hole 55 and the second hinge hole 214 and rotationally connects the sliding sleeve 5 with the other second connecting rod 211.

[0052] The end frame 3 includes a third folding unit 31 arranged between the vertical poles 32, and a sliding sleeve 33 is slidably arranged on the vertical poles 32. The third folding unit 31 includes two third connecting rods 311 hinged in an X shape, one third connecting rod 311 is rotatably connected to the vertical pole 32, and the other third connecting rod 311 is rotatably connected to the sliding sleeve 33. Moreover, a second connecting rod 211 in the second folding unit 21 is rotatably connected to the vertical pole 32. The sliding sleeve 33 can drive the other second connecting rod 211 in the second folding unit 21 to move, so that the second folding unit 21 and the third folding unit 31 can be folded synchronously. The setting of the sliding sleeve 33 facilitates the synchronous folding of the second folding unit 21 and the third folding unit 31, facilitates the unfolding and folding of the camper, and is convenient for users to use.

[0053] In this embodiment, the upper and lower ends of the vertical rod 32 are respectively fixed with an upper connecting end 321 and a lower connecting end 324, the upper connecting end 321 is provided with a first hinge groove 322 adapted to the third connecting rod 311 and a third hinge groove 323 adapted to the second connecting rod 211, the sliding sleeve 33 is provided with a second hinge groove 331 adapted to another third connecting rod 311 on the third folding unit 31, and the lower connecting end 324 is provided with a connecting groove 325 adapted to the first supporting connecting rod 112.

[0054] Preferably, the end frame 3 includes two groups of third folding units 31, the two third connecting rods 311 on the two groups of third folding units 31 are respectively rotatably connected, the two vertical rods 32 are each provided with a first hinge groove 322, the sliding sleeve 33 is provided with a second hinge groove 331 adapted to the second connecting rod 211, and the two third connecting rods 311 on one group of third folding units 31 are relatively bent, so that the first hinge grooves 322 on the two vertical rods 32 are relatively arranged, and the second hinge grooves on the sliding sleeves 33 on the two vertical rods 32 are relatively arranged. 331 are arranged relatively to each other, and the relatively bent third connecting rod 311 facilitates the first hinge groove 322 and the second hinge groove 331 on both sides of the end frame 3 to be arranged relatively to each other, which is convenient for the manufacturer to assemble the camper, and the structure is beneficial to reducing the types of parts of the camper, and is beneficial to reducing the types of molds of the camper, thereby reducing the production cost of the camper. In the present invention, a bending portion 312 is provided on the third connecting rod 311, and the bending portion 312 on the third connecting rod 311 on the same third folding unit 31 is bent toward the other third connecting rod 311.

[0055] In this embodiment, two auxiliary connecting rods 212 are rotatably provided on the sliding sleeve 33, and a fourth hinge groove 332 adapted to the auxiliary connecting rod 212 is provided on the sliding sleeve 33. The two auxiliary connecting rods 212 are respectively rotatably connected with the two second connecting rods 211 in the second folding unit 21 to form a four-bar mechanism. The arrangement of the two auxiliary connecting rods 212 facilitates the flexible unfolding and folding of the second folding unit 21, reduces the jamming of the second folding unit 21 during use, facilitates the unfolding and folding of the camper, and is convenient for users.

[0056] The connecting seat 111 is provided with a storage groove 119, and the storage groove 119 is provided with a traction portion 115. The connecting seat 111 can be pulled upward by the traction portion 115, so that the first folding unit 11 is relatively folded. The setting of the traction portion 115 in this structure is convenient for the user to quickly control the folding of the base frame 1, which is convenient for the user to use, and the setting of the storage groove 119 is convenient for the hidden storage of the traction portion 115, so as to prevent the traction portion 115 from protruding from above the base frame 1 and affecting the user's placement of items in the camper.

[0057] In this embodiment, four movable grooves 1111 are arranged on the lower side of the connecting seat 111, one end of the first supporting link 112 and the second supporting link 113 are respectively rotatably arranged in a movable groove 1111, and a clamping wall 1112 is arranged on the upper side of the movable groove 1111. When the base frame 1 is unfolded, the first supporting link 112 and the second supporting link 113 are respectively clamped on the clamping wall 1112.

[0058] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A camping vehicle with a stable structure, comprising a vehicle body and wheels, wherein a base frame (1) is arranged at the bottom of the vehicle body, foldable end frames (3) are arranged at the front and rear ends of the vehicle body, a pull rod is movably arranged on one end frame (3), vertical poles (32) are arranged on both sides of the end frame (3), foldable side frames (2) are arranged on the left and right sides of the vehicle body, and the two ends of the side frames (2) are connected to the vertical poles (32) on the two end frames (3), characterized in that: The base frame (1) comprises two groups of first folding units (11), the two groups of first folding units (11) are respectively connected to the two end frames (3), the first folding units (11) comprise a connecting seat (111), two first supporting links (112) and two second supporting links (113) are rotatably arranged on the lower side of the connecting seat (111), the two first supporting links (112) are respectively rotatably connected to the vertical rods (32) on both sides of the end frame (3), and the second supporting links (113) on the two first folding units (11) cross each other to form an X shape, so that one first folding unit (11) can support another first folding unit (11); The side frame (2) is provided with a pull rod (4) respectively connected to the first folding unit (11), and a guide sleeve (116) is slidably provided on the pull rod (4), and the guide sleeve (116) is rotatably connected to the second supporting connecting rod (113). The side frame (2) can pull the second supporting connecting rod (113) through the pull rod (4) and the guide sleeve (116).

2. A camper with a stable structure according to claim 1, characterized in that: The middle part of the second supporting link (113) is bent downward and a swing groove (114) is formed on the upper side of the second supporting link (113); the second supporting link (113) on another first folding unit (11) passes through the swing groove (114) and is connected to the pull rod (4); the swing groove (114) can support the second supporting link (113).

3. A camper with a stable structure according to claim 1, characterized in that: The side frame (2) comprises two groups of second folding units (21), the second folding units (21) comprise two second connecting rods (211) hinged in an X shape, the two second connecting rods (211) on the two groups of second folding units (21) are rotatably connected respectively, a sliding sleeve (5) is slidably arranged on the pull rod (4), the pull rod (4) is rotatably connected to a second connecting rod (211) on the second folding unit (21), the sliding sleeve (5) is rotatably connected to another second connecting rod (211) on the second folding unit (21), and the two second connecting rods (211), the sliding sleeve (5) and the pull rod (4) are combined to form a four-bar slider mechanism.

4. A structurally stable camper according to claim 3, characterized in that: The sliding sleeve (5) is provided with a sliding hole (53) adapted to the pull rod (4), and a through hole (54) and a countersunk hole (55) are provided on the side wall of the sliding hole (53). The countersunk hole (55) is arranged in the extension direction of the through hole (54). The fastener can pass through the through hole (54) and be installed in the countersunk hole (55), so that the fastener can rotatably connect the sliding sleeve (5) with the second connecting rod (211).

5. A camper with a stable structure according to claim 4, characterized in that: The sliding sleeve (5) comprises two sleeves (51) arranged at an interval, the two sleeves (51) are fixedly connected via a fixing rod (52), and the sleeves (51) are respectively slidably connected to the pull rod (4).

6. A structurally stable camper according to claim 3, characterized in that: The pull rod (4) is arranged vertically, and the two second connecting rods (211) on the second folding unit (21) and the pull rod (4) are distributed in an isosceles triangle, thereby preventing the pull rod (4) from swinging to the sides during the unfolding or folding of the two second connecting rods (211) on the second folding unit (21).

7. A camper with a stable structure according to claim 3, characterized in that: The end frame (3) comprises a third folding unit (31) arranged between the vertical rods (32), a sliding sleeve (5) is slidably arranged on the vertical rods (32), the third folding unit (31) comprises two third connecting rods (311) hinged in an X shape, one third connecting rod (311) is rotatably connected to the vertical rod (32), the other third connecting rod (311) is rotatably connected to the sliding sleeve (5), and a second connecting rod (211) in the second folding unit (21) is rotatably connected to the vertical rod (32), and the sliding sleeve (5) can drive the other second connecting rod (211) in the second folding unit (21) to move, so that the second folding unit (21) and the third folding unit (31) can be folded synchronously.

8. A structurally stable camper according to claim 7, characterized in that: The end frame (3) comprises two groups of third folding units (31), the two third connecting rods (311) on the two groups of third folding units (31) are respectively rotatably connected, the two vertical rods (32) are each provided with a first hinge groove (322), the sliding sleeve (5) is provided with a second hinge groove (331) adapted to the second connecting rod (211), and the two third connecting rods (311) on one group of third folding units (31) are bent relative to each other, so that the first hinge grooves (322) on the two vertical rods (32) are arranged relative to each other, and the second hinge grooves (331) on the sliding sleeves (5) on the two vertical rods (32) are arranged relative to each other.

9. A structurally stable camper according to claim 8, characterized in that: Two auxiliary connecting rods (212) are rotatably arranged on the sliding sleeve (5), and the two auxiliary connecting rods (212) are rotatably connected to the two second connecting rods (211) in the second folding unit (21) respectively to form a four-bar mechanism.

10. A camper with a stable structure according to claim 1, characterized in that: The connection seat (111) is provided with a receiving groove (119), and the receiving groove (119) is provided with a traction portion (115), and the connection seat (111) can be pulled to move upward by the traction portion (115), so that the first folding unit (11) is relatively folded.

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