A retractable and adjustable material rack

Abstract

This invention discloses a telescopic and adjustable material rack, belonging to the field of logistics vehicle technology. It includes a telescopic base and a buffer plate disposed on the telescopic base. The telescopic base includes a middle base and front and rear bases movably disposed on both sides of the middle base. Both the front and rear bases are provided with perforated curved plates. Strips are movably disposed on the perforated curved plates. The strips are provided with limiting devices a and b, as well as a clamping device and a rotation limiting device. The middle base is provided with locks and locking devices for fixing the front and rear bases. The beneficial effects of this invention are: expanding the application range of the material rack, reducing transportation costs, and adapting to different vehicle sizes by adjusting the width of the material rack.

Description

Technical Field

[0001] This invention relates to a retractable and adjustable material rack, belonging to the field of logistics vehicle technology. Background Technology

[0002] The material rack uses its fixing devices to secure products during transportation. The existing material racks have fixed external dimensions and fixed fixing device positions. However, there are many product specifications, and each specification of product requires a corresponding material rack of a certain external size. This requires the use of a large number of material racks and fixing devices of different sizes, resulting in high transportation costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a retractable and adjustable material rack that is adaptable to the transportation of products of different specifications and sizes, thereby reducing costs.

[0004] The technical solution of the present invention is: a telescopic and adjustable material rack, including a telescopic base and a buffer plate disposed on the telescopic base. The telescopic base includes a middle base and a front base and a rear base that are movably disposed on both sides of the middle base. Both the front base and the rear base are provided with perforated curved plates. Strips are movably disposed on the perforated curved plates. The strips are provided with a limiting device a, a limiting device b, a pressing device and a rotation limiting device. The middle base is provided with a lock and a locking device for fixing the front base and the rear base.

[0005] The limiting device a includes a fixed bent plate a fixed on a strip, a limiting plate fixed in the middle of the fixed bent plate a, a column passing through the fixed bent plate a and the limiting plate, a mounting plate fixed at the bottom of the column, a plurality of plungers for passing through holes a and b provided at the bottom of the mounting plate, the plurality of holes a and b respectively provided on the strip and the perforated bent plate, a spring a sleeved on the column, the spring a located between the limiting plate and the mounting plate, a guide plate a provided on the column, a guide hole provided on the fixed bent plate a to cooperate with the guide plate a, and a handle pin a provided on the column.

[0006] The limiting device b includes a vertical limiting surface whose bottom is fixed on a strip, and an inclined guide slope connected to the top of the vertical limiting surface.

[0007] The rotation limiting device includes a telescopic limiting device fixed on a base plate. The base plate is set on a strip by a bolt assembly a. The base plate has an arc-shaped side end. The arc-shaped side end has a serration a. The serration a can mesh with the serration b on the toothed plate. The toothed plate is set on the strip by a bolt assembly b.

[0008] The telescopic limiting device includes a fixed curved plate b fixed to the base plate, an angle steel fixed to the open end of the fixed curved plate b, a sliding curved plate slidably connected to the fixed curved plate b, elongated holes on both sides of the sliding curved plate, a guide bolt passing through and connecting the elongated holes and the fixed curved plate b, a locking nut threaded to the end of the guide bolt, a sleeve with its open end passing through and fixed to the fixed curved plate b, the other end of the sleeve being fixed to the sliding curved plate, a screw threaded through the angle steel and threaded to the internal thread of the sleeve, a rotation drive mechanism at the end of the screw, a guide plate b with its top fixed to the sleeve, a guide plate b with its end fixed to the sliding curved plate, and a guide plate b passing through and movably connected to the fixed curved plate b.

[0009] The rotary drive mechanism is a manual rotary drive mechanism, including a wing nut threaded to the end of a screw, a limiting pin a passing through the wing nut and extending into the screw, the screw passing through washers a and b, washers a and b respectively fitting against the two sides of the angle steel, a stop pin on the screw contacting the surface of washer a, the side of washer b fitting against the limiting nut, and the screw passing through and threadedly connected to the limiting nut.

[0010] The central base includes square tubes with open ends and arranged in parallel. Adjacent square tubes are connected by a connecting rod a. The square tubes include a central square tube and side square tubes a and b symmetrically distributed on both sides of the central square tube. The two ends of the perforated bent plate are connected to the side tubes b and a, respectively.

[0011] Both the front base and the rear base include a connecting rod b and several perforated bent plates that are vertically connected to the connecting rod b. The connecting rod b has side tubes at both ends. The several perforated bent plates are respectively inserted into the middle square tube and the side square tube a, and the side tubes are inserted into the side tube b.

[0012] The lock includes a zigzag plate fixed on the side tube b, a limit plate fixed on the zigzag plate, a movable rod passing through and movably connecting the zigzag plate and the limit plate, the end of the movable rod being inserted into the insertion hole a on the side tube b and the insertion hole b on the side tube, a limit pin b fixed on the movable rod, a spring b sleeved on the movable rod, the spring b being located between the limit pin b and the limit plate, a baffle plate on the movable rod, a clearance hole on the zigzag plate, the baffle plate being detachably movably engaged with the clearance hole, and a handle pin b on the movable rod.

[0013] Several of the aforementioned sockets b are located on the same straight line. Socket a is a round hole, and socket b is an elongated hole. By moving them relative to each other, the center of socket a can be made coaxial with the center of any socket b and the movable plug rod.

[0014] The locking device includes a fixing nut located on the side tube b, a lifting eye bolt threadedly connected to the fixing nut passing through the side tube b, and a locking nut located above the fixing nut.

[0015] The buffer plate includes a fixed buffer support plate, a movable buffer support plate a, and a movable buffer support plate b that can be spliced ​​together. The fixed buffer support plate is fixed to the middle of the central base. The movable buffer support plates a are located on both sides of the central base. The movable buffer support plates b are fixed to the front base and the rear base respectively. The central base is provided with a slide rail, and the movable buffer support plate b is slidably connected to the slide rail. The central base is provided with perforated curved plates on both sides, and the strips connected to the movable buffer support plate a are movably disposed on the perforated curved plates.

[0016] The fixed buffer support plate, the movable buffer support plate a, and the movable buffer support plate b are all non-metallic plates with a double-layer structure.

[0017] Both ends of the front base and the rear base are provided with a retaining plate for limiting the riser. The bottom of the riser is rotatably connected to the retaining plate, the top of the riser is provided with a plug, and the bottom of the retaining plate is provided with a foot.

[0018] The beneficial effects of this invention are as follows: By changing the relative position of the bending plate and the strip through this adjustment device, the distance between the limiting devices on both sides of the material rack and the distance between the clamping devices are changed. By setting the clamping devices and different limiting devices on the material rack, the products to be transported are fixed from multiple positions, making the material rack adaptable to the transportation of products of different specifications and sizes, expanding the application range of the material rack and reducing the transportation costs required; the material rack is equipped with uprights around its perimeter, realizing the stacking of the material rack vertically, making more reasonable use of space; by adjusting the width of the material rack, it can be adapted to different vehicle sizes. Attached Figure Description

[0019] Figure 1 The structure of the present invention Figure 1 ;

[0020] Figure 2 The structure of the present invention Figure 2 ;

[0021] Figure 3 Working state diagram of the present invention;

[0022] Figure 4 Here is a structural diagram of the limiting device a;

[0023] Figure 5 This is the front view of the limiting device a;

[0024] Figure 6 This is a structural diagram of the limiting device b and the clamping device;

[0025] Figure 7 This is a structural diagram of the rotation limiting device;

[0026] Figure 8 This is a top view of the rotation limiting device;

[0027] Figure 9 A partial view of the rotation limiting device;

[0028] Figure 10 This is a diagram showing the working state of the rotation limit device;

[0029] Figure 11 This is a structural diagram of the central base.

[0030] Figure 12 This is a structural diagram of the front base;

[0031] Figure 13 For locking devices and lock structures Figure 1 ;

[0032] Figure 14 For locking devices and lock structures Figure 2 ;

[0033] Figure 15 Diagram showing the stacking and usage status of the material rack;

[0034] Figure 16 This is a diagram showing the stacked storage state of the material rack when it is not loaded with materials.

[0035] The reference numerals in the attached diagram are as follows: 1. Slat; 2. Limiting device a; 2.1. Handle pin a; 2.2. Fixed bend plate; 2.3. Guide hole; 2.4. Hole a; 2.5. Hole b; 2.6. Limiting plate; 2.7. Column; 2.8. Mounting plate; 2.9. Plunger; 2.10. Spring a; 2.11. Guide plate a; 3. Limiting device b; 3.1. Vertical limiting surface; 3.2. Guide slope; 4. Clamping device 5. Perforated bent plate; 6. Rotation limiting device; 6.1. Base plate; 6.2. Fixed bent plate b; 6.3. Angle steel; 6.4. Sliding bent plate; 6.5. Long slotted hole; 6.6. Guide bolt; 6.7. Sleeve; 6.8. Screw; 6.9. Limiting nut; 6.10. Stop pin; 6.11. Washer a; 6.12. Wing nut; 6.13. Guide plate b; 6.14. Washer b; 6.15. 6.16. Sawtooth a, Tooth plate, 7. Middle base, 7.1. Middle square tube, 7.2. Side square tube a, 7.3. Side square tube b, 7.4. Connecting rod a, 7.5. Insertion hole a, 7.6. Slide rail, 8. Front base, 8.1. Connecting rod b, 8.2. Side tube, 8.3. Insertion hole b, 9. Rear base, 10. Lock, 10.1. Baffle, 10.2. Clearance hole, 10.3. Z-shaped plate, 10.4. Limiting switch 10.5 Plate, 10.6 Handle pin b, 10.7 Spring b, 10.8 Movable insert rod, 10.9 Limit pin b, 11. Locking device, 11.1 Fixing nut, 11.2 Lifting eye bolt, 11.3 Locking nut, 12.1 Fixed buffer support plate, 12.2 Movable buffer support plate a, 12.3 Movable buffer support plate b, 13. Enclosure, 14. Riser, 15. Plug, 16. Foot. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-16 Further explanation of the present invention:

[0037] A telescopic and adjustable material rack includes a telescopic base and a buffer plate disposed on the telescopic base. The telescopic base includes a middle base 7 and a front base 8 and a rear base 9 movably disposed on both sides of the middle base 7. Both the front base 8 and the rear base 9 are provided with perforated bent plates 5. A strip 1 is movably disposed on the perforated bent plates 5. The strip 1 is provided with a limiting device a2, a limiting device b3, a pressing device 4, and a rotation limiting device 6. The middle base 7 is provided with a lock 10 for fixing the front base 8 and the rear base 9 and a locking device 11. The limiting device a2 includes a fixed bent plate a2.2 fixed to the plate 1. The fixed bent plate a2.2 has a U-shaped structure. The bottom two sides of the U-shaped structure are fixed to the plate 1 at both ends of the bent plate 5 by bolts. The plate 1 is movably and vertically arranged above both ends of the bent plate 5. A limiting plate 2.6 is fixed in the middle of the fixed bent plate a2.2. A column 2.7 passes through the fixed bent plate a2.2 and the limiting plate 2.6. A mounting plate 2.8 is fixed at the bottom of the column 2.7. The bottom of the mounting plate 2.8 is provided with several plungers 2.9 for through holes a2.4 and b2.5. Several holes a2.4 and b2.5 are respectively provided on the plate 1 and the bent plate 5. A spring is fitted on the outer sleeve of the column 2.7. Spring 2.10 is located between limiting plate 2.6 and mounting plate 2.8. A guide plate a2.11 is provided on column 2.7. A guide hole 2.3 is opened on fixed bending plate a2.2 to cooperate with guide plate a2.11. A handle pin a2.1 is provided on column 2.7. Through the guide cooperation, the downward-moving plunger 2.9 is aligned with hole a2.4, allowing plunger 2.9 to be smoothly inserted into hole a2.4. By adjusting the position of bending plate 5, when hole b2.5 is aligned with hole a2.4, because spring 2.10 is in a compressed state, plunger 2.9 can automatically pass through holes a2.4 and b2.5, achieving limiting and fixing of bending plate 5 and strip 1.

[0038] The limiting device b3 includes a vertical limiting surface 3.1 with its bottom fixed to the plate 1, and an inclined guide slope 3.2 connected to the top of the vertical limiting surface 3.1. When the product is placed, its two ends move down to the bottom of the vertical limiting surface 3.1 by the guide slope 3.2. The vertical positioning surface 3.1 is located on both sides of the product, which plays a positioning role for the product.

[0039] The clamping device 4 is a horizontal quick clamp. The two sides of the product are clamped by the horizontal quick clamp to prevent the product from moving up and down. The horizontal quick clamp is a commercially available product.

[0040] The rotation limiting device 6 includes a telescopic limiting device fixed on a base plate 6.1. The base plate 6.1 is mounted on the strip 1 by a bolt assembly a. The base plate 6.1 has an arc-shaped side end, and the arc-shaped side end has a serration a6.15. The serration a6.15 can mesh with the serration b on the toothed plate 6.16. The toothed plate 6.16 is mounted on the strip 1 by a bolt assembly b.

[0041] The telescopic limiting device includes a fixed curved plate b6.2 fixed on a base plate 6.1, an angle steel 6.3 fixed to the open end of the fixed curved plate b6.2, a sliding curved plate 6.4 slidably connected to the fixed curved plate b6.2, and a polyurethane stop block fixed to the end of the sliding curved plate 6.4, which limits contact with the product. The sliding curved plate 6.4 has elongated holes 6.5 on both sides, and guide bolts 6.6 pass through the elongated holes 6.5 and the fixed curved plate b6.2. The sliding curved plate 6.4 is slidably connected to the fixed curved plate 6.2 via the guide bolts 6.6. The guide bolt 6.6 is threaded to a locking nut at its end. The open end of the sleeve 6.7 passes through and is fixed to the fixed bending plate b6.2. The other end of the sleeve 6.7 is fixed to the sliding bending plate 6.4. The screw 6.8 passing through the angle steel 6.3 is threaded to the internal thread of the sleeve 6.7. The end of the screw 6.8 is provided with a rotation drive mechanism. The top of the guide plate b6.13 is fixed to the sleeve 6.7. The end of the guide plate b6.13 is fixed to the sliding bending plate 6.4. The guide plate b6.13 passes through and is movably connected to the fixed bending plate b6.2.

[0042] The rotary drive mechanism is a manual rotary drive mechanism, comprising a wing nut 6.12 threaded to the end of the screw 6.8, a limiting pin passing through the wing nut 6.12 and extending into the screw 6.8, the screw 6.8 passing through washers a6.11 and b6.14, the washers a6.11 and b6.14 respectively fitting against both sides of the angle steel 6.3, a stop pin 6.10 on the screw 6.8 contacting the surface of washer a6.11, the side of washer b6.14 fitting against the limiting nut 6.9, the screw 6.8 passing through and threadedly connected to the limiting nut 6.9, the limiting nut 6.9 and the stop pin 6.10 cooperating to restrict the screw 6.8 from axial movement, the rotation of the screw 6.8 within the sleeve 6.7 is converted into the axial movement of the sliding bending plate 6.4 driven by the sleeve 6.7.

[0043] The specific operation of the rotary limiting device 6 is as follows: rotate the wing nut 6.12 to move the sliding bend plate 6.4 towards the placed product, so that the polyurethane stop block is placed against the outside of the product to limit and fix it. When vibration or collision occurs during transportation, the screw 6.8 is subjected to axial force, making the structure more stable and able to more reliably perform the limiting and fixing function. The polyurethane stop block at the end of the sliding bend plate 6.4 can play a role in shock absorption and increase friction, increasing the stability of the limiting and fixing, and protecting the product from damage caused by vibration or collision during transportation.

[0044] The central base 7 includes square tubes open at both ends and arranged in parallel. Adjacent square tubes are connected by a connecting rod a7.4. Each square tube includes a central square tube 7.1 and side square tubes a7.2 and b7.3 symmetrically distributed on both sides of the central square tube 7.1. Perforated bent plates 5 are connected to the side square tubes b7.3 and a7.2 at both ends. The front base 8 and the rear base 9 both include a connecting rod b8.1 and several perforated bent plates 5 vertically connected to the connecting rod b8.1. Side tubes 8.2 are provided at both ends of the connecting rod b8.1. The perforated bent plates 5 are respectively inserted into the central square tube 7.1 and the side square tubes a7.2. The side tubes 8.2 are inserted into the side square tubes b7.3, so that the front base 8 and the rear base 9 can be adjusted in position along the extension direction of the central square tube 7.1 to change the size of the material rack.

[0045] The lock 10 includes a U-shaped plate 10.3 fixed to the side tube b7.3, a limit plate 10.4 fixed on the U-shaped plate 10.3, a movable rod 10.7 passing through and movably connecting the U-shaped plate 10.3 and the limit plate 10.4, the end of the movable rod 10.7 being inserted into a hole a7.5 on the side tube b7.3 and a hole b8.3 on the side tube 8.2, a limit pin b10.8 fixed on the movable rod 10.7, and a spring b10.6 sleeved on the movable rod 10.7. 10.6 is located between the limiting pin b10.8 and the limiting plate 10.4. The movable insert rod 10.7 is provided with a baffle 10.1, and the U-shaped plate 10.3 has a clearance hole 10.2. The baffle 10.1 is detachably and movably engaged with the clearance hole 10.2. The movable insert rod 10.7 is provided with a handle pin b10.5. The handle pin b10.8 is provided to facilitate manual pulling and rotating of the movable insert rod 10.7. When it is necessary to insert the movable insert rod 10.7 into the insertion hole a7.5 and the insertion hole b8.3, the movable insert rod 10.7 is rotated. 0.7. Align the baffle 10.1 with the clearance hole 10.2. The baffle 10.1 moves along the clearance hole 10.2. The movable insert rod 10.7 moves towards the insertion hole under the action of the spring b10.6 and inserts into the insertion holes a7.5 and b8.3. The limiting pin b10.8 limits the movement of the movable insert rod 10.7 to prevent it from overtraveling. After it moves into place, rotate the movable insert rod 10.7 so that the end of the baffle 10.1 rotates a certain angle and separates from the clearance hole 10.2, preventing the movable insert rod 10.7 from overtraveling. 7. Accidental Disengagement from the Socket: When it is necessary to pull out the movable plug 10.7, first rotate the movable plug 10.7 so that the end of the baffle 10.1 is aligned with the clearance hole 10.2, then pull the movable plug 10.7 to separate its end from the socket. After the baffle 10.1 is completely away from the clearance hole 10.2, rotate the movable plug 10.7 and then release the movable plug 10.7. Under the action of the spring b10.6, the end of the baffle 5.1 rests against the Z-shaped plate 3, restricting the axial movement of the movable plug 5.7 and preventing its end from automatically entering the socket.

[0046] Several of the aforementioned sockets b8.3 are located on the same straight line. Socket a7.5 is a round hole, and socket b8.3 is an elongated hole. By relative movement, the center of socket a7.5 can be made coaxial with the center of any socket b8.3 and the movable plug 10.7.

[0047] The locking device 11 includes a fixing nut 11.1 located on the side tube b7.3, a lifting eye bolt 11.2 threadedly connected to the fixing nut 11.1, and a locking nut 11.3 located above the fixing nut 11.1. After the side tube 8.2 extends outward from the side tube b7.3, the front and rear bases bear the weight, inevitably causing a slight tilt of the side tube 8.2. To avoid this, the lifting eye bolt 11.2 and the fixing nut 11.1 are provided. The lifting eye bolt 11.2 presses the side tube 8.2 extending into the side tube b7.3, preventing relative movement between the side tube 8.2 and the side tube b7.3. This prevents the side tube 8.2 from tilting, resulting in a more stable structure.

[0048] The buffer plate includes a fixed buffer support plate 12.1, a movable buffer support plate a12.2, and a movable buffer support plate b12.3 that can be spliced ​​together. The fixed buffer support plate 12.1 is fixed to the middle of the central base 7. The movable buffer support plates a12.2 are located on both sides of the central base 7. The movable buffer support plates b12.3 are fixed to the front base 8 and the rear base 9 respectively. The central base 7 is provided with a slide rail 7.6, and the movable buffer support plates b12.3 are slidably connected to the slide rail 7.6. The central base 7 is provided with perforated curved plates 5 on both sides, and the strips 1 connected to the movable buffer support plates a12.2 are movably disposed on the perforated curved plates 5.

[0049] The fixed buffer support plate 12.1, the movable buffer support plate a12.2, and the movable buffer support plate b12.3 are all non-metallic plates with a double-layer structure. The upper and lower non-metallic plates are EVA foam board and PVC foam board, respectively. The foam board has a certain degree of flexibility to avoid direct and rigid contact between the carrier base and the transported product. When bumps occur, rigid contact is avoided to prevent damage to the product, thus providing a buffering and protection function for the product.

[0050] Both ends of the front base 8 and the rear base 9 are provided with retaining plates 13 for limiting the position of the upright pipe 14. The bottom of the upright pipe 14 is rotatably connected to the retaining plates 13. The top of the upright pipe 14 is provided with a plug 15, and the bottom of the retaining plates 13 is provided with feet 16. When the material racks are stacked up and down, the plug 15 of the bottom material rack and the feet 16 of the top material rack are inserted and engaged. Figure 15 As shown, this design effectively utilizes the space above the material rack. The end cap 15 and the base 16 are detachably plugged in, allowing the top material rack to be separated from the bottom material rack. When the material rack is not in use, it can also be stacked for storage, such as... Figure 16As shown, when storing, the riser 14 can be rotated to a horizontal position and placed on the front base 8 and the rear base 9. The bottom of the top material rack enclosure 13 is placed on top of the bottom material rack enclosure 13, thereby reducing the height of the material rack and improving space utilization.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A telescopic and adjustable material rack, characterized in that, The device includes a telescopic base and a buffer plate disposed on the telescopic base. The telescopic base includes a middle base (7) and a front base (8) and a rear base (9) that are movably disposed on both sides of the middle base (7). The front base (8) and the rear base (9) are each provided with a perforated bent plate (5). A strip (1) is movably disposed on the perforated bent plate (5). The strip (1) is provided with a limiting device a (2), a limiting device b (3), a pressing device (4), and a rotation limiting device (6). The middle base (7) is provided with a lock (10) for fixing the front base (8) and the rear base (9) and a locking device (11). The limiting device a (2) includes a fixed bent plate a (2.2) fixed on a strip (1), a limiting plate (2.6) fixed in the middle of the fixed bent plate a (2.2), a column (2.7) passing through the fixed bent plate a (2.2) and the limiting plate (2.6), a mounting plate (2.8) fixed at the bottom of the column (2.7), and a plurality of plungers (2.9) for passing through holes a (2.4) and holes b (2.5) at the bottom of the mounting plate (2.8). Hole b (2.5) is respectively set on the strip (1) and the perforated bent plate (5). Spring a (2.10) is sleeved on the column (2.7). Spring a (2.10) is located between the limiting plate (2.6) and the mounting plate (2.8). Guide plate a (2.11) is provided on the column (2.7). Guide hole (2.3) that cooperates with guide plate a (2.11) is opened on the fixed bent plate a (2.2). Handle pin a (2.1) is provided on the column (2.7). The rotation limiting device (6) includes a telescopic limiting device fixed on a base plate (6.1). The base plate (6.1) is mounted on a strip (1) by a bolt assembly a. The base plate (6.1) has an arc-shaped side end, and the arc-shaped side end has a serration a (6.15). The serration a (6.15) can mesh with the serration b on the toothed plate (6.16). The toothed plate (6.16) is mounted on the strip (1) by a bolt assembly b. The telescopic limiting device includes a fixed curved plate b (6.2) fixed on a base plate (6.1), an angle steel (6.3) fixed to the open end of the fixed curved plate b (6.2), a sliding curved plate (6.4) slidably connected to the fixed curved plate b (6.2), elongated holes (6.5) on both sides of the sliding curved plate (6.4), a guide bolt (6.6) passing through the elongated holes (6.5) and the fixed curved plate b (6.2), a locking nut threaded to the end of the guide bolt (6.6), and an open end of the sleeve (6.7). The sleeve (6.7) is fixed to the fixed bending plate b (6.2) through and fixed at the other end, and the sleeve (6.7) is fixed to the sliding bending plate (6.4). The screw (6.8) that passes through the angle steel (6.3) is threaded to the internal thread of the sleeve (6.7). The end of the screw (6.8) is provided with a rotation drive mechanism. The top of the guide plate b (6.13) is fixed to the sleeve (6.7), and the end of the guide plate b (6.13) is fixed to the sliding bending plate (6.4). The guide plate b (6.13) passes through and is movably connected to the fixed bending plate b (6.2).

2. The telescopic and adjustable material carrier according to claim 1, characterized in that, The limiting device b (3) includes a vertical limiting surface (3.1) with its bottom fixed on the strip (1), and an inclined guide slope (3.2) connected to the top of the vertical limiting surface (3.1).

3. The telescopic and adjustable material carrier according to claim 1, characterized in that, The rotary drive mechanism is a manual rotary drive mechanism, including a wing nut (6.12) threaded to the end of the screw (6.8), a limiting pin a passing through the wing nut (6.12) and extending into the screw (6.8), the screw (6.8) passing through a washer a (6.11) and a washer b (6.14), the washer a (6.11) and the washer b (6.14) respectively fitting against both sides of the angle steel (6.3), a stop pin (6.10) on the screw (6.8) contacting the surface of the washer a (6.11), the side of the washer b (6.14) fitting against the limiting nut (6.9), and the screw (6.8) passing through and threadedly connected to the limiting nut (6.9).

4. The telescopic and adjustable material carrier according to claim 1, characterized in that, The central base (7) includes a square tube with open ends and arranged in parallel. Adjacent square tubes are connected by a connecting rod a (7.4). The square tube includes a central square tube (7.1) and side square tubes a (7.2) and b (7.3) symmetrically distributed on both sides of the central square tube (7.1). The two ends of the perforated bent plate (5) are connected to the side square tubes b (7.3) and a (7.2) respectively. Both the front base (8) and the rear base (9) include a connecting rod b (8.1) and several perforated bent plates (5) that are vertically connected to the connecting rod b (8.1). The connecting rod b (8.1) has side tubes (8.2) at both ends. The several perforated bent plates (5) are respectively inserted into the middle square tube (7.1) and the side square tube a (7.2). The side tube (8.2) is inserted into the side square tube b (7.3).

5. The telescopic and adjustable material carrier according to claim 4, characterized in that, The lock (10) includes a zigzag plate (10.3) fixed on the side tube b (7.3), a limit plate (10.4) fixed on the zigzag plate (10.3), a movable insert rod (10.7) passing through and movably connecting the zigzag plate (10.3) and the limit plate (10.4), the end of the movable insert rod (10.7) being inserted into the insertion hole a (7.5) on the side tube b (7.3) and the insertion hole b (8.3) on the side tube (8.2), and the movable insert rod (10.7) being fixed on the side tube b (7.3). A limiting pin b (10.8) is fixed, and a spring b (10.6) is sleeved on the movable insert rod (10.7). The spring b (10.6) is located between the limiting pin b (10.8) and the limiting plate (10.4). A baffle (10.1) is provided on the movable insert rod (10.7), and a clearance hole (10.2) is opened on the zigzag plate (10.3). The baffle (10.1) can be detachably engaged with the clearance hole (10.2). A handle pin b (10.5) is provided on the movable insert rod (10.7). Several of the aforementioned sockets b (8.3) are located on the same straight line. Socket a (7.5) is a round hole, and socket b (8.3) is an elongated hole. By relative movement, the center of socket a (7.5) can be made coaxial with the center of any socket b (8.3) and the movable plug (10.7).

6. The telescopic and adjustable material carrier according to claim 4, characterized in that, The locking device (11) includes a fixing nut (11.1) located on the side tube b (7.3), a lifting eye bolt (11.2) threadedly connected to the fixing nut (11.1) passing through the side tube b (7.3), and the lifting eye bolt (11.2) threadedly connected to a locking nut (11.3) located above the fixing nut (11.1).

7. The telescopic and adjustable material carrier according to claim 1, characterized in that, The buffer plate includes a fixed buffer support plate (12.1), a movable buffer support plate a (12.2), and a movable buffer support plate b (12.3) that can be spliced ​​together. The fixed buffer support plate (12.1) is fixed in the middle of the middle base (7). The movable buffer support plate a (12.2) is located on both sides of the middle base (7). The movable buffer support plate b (12.3) is fixed on the front base (8) and the rear base (9) respectively. The middle base (7) is provided with a slide rail (7.6). The movable buffer support plate b (12.3) is slidably connected to the slide rail (7.6). The middle base (7) is provided with perforated curved plates (5) on both sides. The strip (1) connected to the movable buffer support plate a (12.2) is movably disposed on the perforated curved plate (5). The fixed buffer support plate (12.1), the movable buffer support plate a (12.2), and the movable buffer support plate b (12.3) are all non-metallic plates with a double-layer structure.

8. The retractable and adjustable material carrier according to claim 1, characterized in that, Both ends of the front base (8) and the rear base (9) are provided with a retaining plate (13) for limiting the riser (14). The bottom of the riser (14) is rotatably connected to the retaining plate (13), the top of the riser (14) is provided with a plug (15), and the bottom of the retaining plate (13) is provided with a foot (16).

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