Automatic unloading structure of building material transport vehicle

Abstract

The utility model discloses a building material transport vehicle automatic unloading structure, including hydraulic oil cylinder and the metal piston rod of plug -in in hydraulic oil cylinder, the hydraulic oil cylinder is close to bottom end outside and is provided with the oil reinforced bushing of going in and out, the hydraulic oil cylinder top end inner wall still is provided with dustproof ring, and dustproof ring is connected in the outside of metal piston rod, the metal piston rod can be in hydraulic oil cylinder and dustproof ring and carry out the up and down direction activity, through the additional novel comprehensive protection device, to the core vulnerable component of hydraulic lifting type carriage, namely hydraulic oil cylinder and metal piston rod, design double protection mechanism, adapt building material transport vehicle lifting hopper complete unloading's high frequency working condition, the combination design of semicircular metal protection cover A and semicircular metal protection cover B, can complete the wrapping of hydraulic oil cylinder, form rigid protective barrier, in the unloading operation, can block material splashing and hit cylinder body, prevent the scratch of cylinder body and so on, prolong the service life of oil cylinder.

Description

Technical Field

[0001] This utility model belongs to the technical field of construction transportation, specifically relating to an automatic unloading structure for a construction material transport vehicle. Background Technology

[0002] The automatic unloading structure of construction material transport vehicles (such as dump trucks and sand and gravel trucks) is the core system for achieving efficient unloading of bulk materials such as slag and sand. It mainly consists of hydraulic cylinders, metal piston rods, oil inlet and outlet components, connecting and fixing parts, and control units. Its working principle is that the metal piston rod is driven by hydraulic pressure to rise and fall along the cylinder axis, causing the cargo bucket to rotate around the hinge point. The material is unloaded by gravity, which greatly improves the operation efficiency compared to traditional manual unloading and is a key piece of equipment in modern construction transportation.

[0003] However, this structure operates under complex conditions with high dust levels and frequent material impacts on construction sites. The hydraulic cylinders and metal piston rods are prone to damage due to a lack of targeted protection. Specifically, in the existing structure, the hydraulic cylinders are mostly directly exposed. During unloading, flying sand and hard objects easily impact the cylinder body, causing surface scratches and dents. Simultaneously, construction dust and rainwater adhere to the cylinder body over time, easily causing corrosion, damaging the inner wall sealing surface, increasing the risk of hydraulic oil leakage, and raising maintenance costs. Furthermore, the piston rod lacks lateral support during lifting and lowering; when the material distribution in the hopper is uneven (e.g., one-sided stacking), it is easily bent and deformed by lateral forces. The exposed section of the piston rod is also easily scratched by material impacts, which accelerates the wear of the top dustproof ring, allowing dust to enter the cylinder and causing piston jamming, seal failure, and other malfunctions. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic unloading structure for building material transport vehicles, in order to solve the problems mentioned in the background art, such as the lack of lateral support when the piston rod is raised and lowered, the uneven distribution of materials in the hopper, the susceptibility to bending and deformation due to lateral forces, and the easy damage to the exposed section of the piston rod by the material. The damage will accelerate the wear of the top dustproof ring, causing dust to enter the oil cylinder and causing piston jamming, seal failure and other malfunctions.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic unloading structure for a building material transport vehicle, comprising a hydraulic cylinder and a metal piston rod inserted into the hydraulic cylinder. An oil inlet / outlet reinforcing sleeve is provided near the bottom of the hydraulic cylinder. A dustproof ring is also provided on the inner wall of the top of the hydraulic cylinder, and the dustproof ring is fitted onto the outside of the metal piston rod. The metal piston rod can move vertically between the hydraulic cylinder and the dustproof ring. A top fixing sleeve is welded and fixed to the outside of the top of the metal piston rod. A lifting mounting block is provided at the top of the top fixing sleeve. An mounting pin hole B is provided inside the lifting mounting block. A comprehensive protection device connects the top fixing sleeve to the outside of the hydraulic cylinder.

[0006] Preferably, the comprehensive protection device includes a semi-circular metal protective sleeve A and a semi-circular metal protective sleeve B. The semi-circular metal protective sleeve A is sleeved on the outside of the front half of the hydraulic cylinder, and the semi-circular metal protective sleeve B is sleeved on the outside of the rear half of the hydraulic cylinder. Both the semi-circular metal protective sleeve A and the semi-circular metal protective sleeve B are located at the top of the inlet and outlet oil reinforcement sleeve.

[0007] Preferably, the comprehensive protection device further includes thickened metal fixing strip A, thickened metal fixing strip B, and fixing screws. Thickened metal fixing strip A is provided at both ends of the opening of the semi-circular metal protective sleeve A, and thickened metal fixing strip B is provided at both ends of the opening of the semi-circular metal protective sleeve B. The two thickened metal fixing strips A and the two thickened metal fixing strips B are fixedly connected by multiple fixing screws, so that the semi-circular metal protective sleeve A and the semi-circular metal protective sleeve B are fitted and fixed to the outside of the hydraulic cylinder.

[0008] Preferably, the comprehensive protection device further includes a thickened metal fixing sleeve, a metal rod fixing block, and a lifting protection metal rod. The thickened metal fixing sleeve is welded to the outside of the top fixing sleeve. Metal rod fixing blocks are welded to both the front and rear ends of the thickened metal fixing sleeve. Lifting protection metal rods are vertically welded to the bottom ends of the two metal rod fixing blocks. The two lifting protection metal rods are arranged parallel to the metal piston rod.

[0009] Preferably, the comprehensive protection device further includes lifting holes and lifting protection blocks. Lifting protection blocks are vertically welded to the outer wall of the front end of the upper half of the semi-circular metal protective sleeve A and the outer wall of the rear end of the upper half of the semi-circular metal protective sleeve B. Lifting holes are provided inside the two lifting protection blocks, and the two lifting protection metal rods pass through the lifting holes corresponding to their positions.

[0010] Preferably, the lifting protective metal rod can move up and down in the lifting hole, and the metal piston rod will drive the two lifting protective metal rods to move up and down simultaneously during the up and down movement. The bottom end of the lifting protective metal rod is set as a hemisphere, and the length of the lifting protective metal rod is equal to the length of the metal piston rod.

[0011] Preferably, a base reinforcement sleeve is welded and fixed to the outside of the bottom end of the hydraulic cylinder, and the base reinforcement sleeve is located at the bottom of the inlet and outlet oil reinforcement sleeve. A mounting base is welded laterally to the bottom end of the base reinforcement sleeve.

[0012] Preferably, the mounting base has cylinder mounting blocks at both ends, and each of the two cylinder mounting blocks has a longitudinally penetrating mounting pin hole A at its center. The cylinder mounting blocks are solid metal mounting blocks.

[0013] Preferably, the left end of the oil inlet and outlet reinforcing sleeve is provided with an oil inlet, and the right end of the oil inlet and outlet reinforcing sleeve is provided with an oil outlet, and both the oil inlet and the oil outlet are connected to the inside of the hydraulic cylinder.

[0014] Compared with the prior art, this utility model provides an automatic unloading structure for building material transport vehicles, which has the following beneficial effects: This utility model adds a comprehensive protective device that connects to the top fixed sleeve at the top of the piston rod and the outside of the hydraulic cylinder. This device is designed with a dual protection mechanism for the core vulnerable components of the hydraulic lifting truck body, namely the hydraulic cylinder and the metal piston rod. It is suitable for the high-frequency working conditions of the lifting cargo box of building material transport vehicles for complete unloading. The device, through the combination design of semi-circular metal protective sleeve A and semi-circular metal protective sleeve B, can completely wrap the hydraulic cylinder to form a rigid protective barrier. During the unloading operation, it can prevent material from splashing and hitting the cylinder body, and at the same time prevent external hard objects from scratching the cylinder body when the vehicle is moving or the construction site is working, preventing the cylinder body from being scratched, dented or cracked, and extending the service life of the cylinder. Regarding the protection of the metal piston rod, when the metal piston rod moves up and down, it will simultaneously drive two lifting protection metal rods to slide along the lifting hole. This design can form double-sided lateral support for the piston rod, avoiding the piston rod from shifting due to the impact of material on one side of the hopper when the hopper is completely unloaded. This effectively prevents the piston rod from bending and deforming, ensuring stable lifting action. In addition, the cooperation between the lifting protection metal rod and the lifting hole can provide additional guidance for the up and down movement of the piston rod, preventing the piston rod from experiencing increased friction with the inner wall of the cylinder and the dust seal due to slight displacement after long-term use. This reduces piston rod jamming and wear problems, ensuring smooth extension and retraction of the piston rod during unloading, and preventing the hopper from failing to lift or sink normally due to jamming. Attached Figure Description

[0015] Figure 1 This is a front-view three-dimensional structural diagram of an automatic unloading structure for a building material transport vehicle according to the present invention.

[0016] Figure 2 This is a front view schematic diagram of an automatic unloading structure for a building material transport vehicle according to the present invention.

[0017] Figure 3 This is a right-side plan view of an automatic unloading structure for a building material transport vehicle according to the present invention.

[0018] Figure 4 This is a front-view three-dimensional structural diagram of the comprehensive protection device of this utility model.

[0019] In the diagram: 1. Cylinder mounting block; 2. Mounting base; 3. Base reinforcement sleeve; 4. Mounting pin hole A; 5. Oil inlet; 6. Oil outlet; 7. Oil inlet and outlet reinforcement sleeves; 8. Comprehensive protection device; 9. Hydraulic cylinder; 10. Dustproof ring; 11. Metal piston rod; 12. Top fixing sleeve; 13. Lifting mounting block; 14. Mounting pin hole B; 15. Thickened metal fixing strip A; 16. Thickened metal fixing strip B; 17. Fixing screw; 18. Semi-circular metal protective sleeve A; 19. Semi-circular metal protective sleeve B; 20. Thickened metal fixing sleeve; 21. Metal rod fixing block; 22. Lifting hole; 23. Lifting protection block; 24. Lifting protection metal rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides, for example Figure 1-4 The diagram illustrates an automatic unloading structure for a building material transport vehicle, comprising a hydraulic cylinder 9 and a metal piston rod 11 inserted into the hydraulic cylinder 9. An oil inlet / outlet reinforcing sleeve 7 is provided near the bottom of the hydraulic cylinder 9. A dustproof ring 10 is also provided on the inner wall of the top of the hydraulic cylinder 9, and the dustproof ring 10 is fitted over the metal piston rod 11. The metal piston rod 11 can move vertically between the hydraulic cylinder 9 and the dustproof ring 10. The hydraulic cylinder 9 is the core actuator, and its interior is a hollow cylinder. The metal piston rod 11 is inserted into it along the central axis of the cylinder and can move vertically between the hydraulic cylinder 9 and the dustproof ring 10 on the inner wall of the top. The dustproof ring 10 fits tightly against the outer wall of the piston rod, preventing construction dust and sand from entering the cylinder as the piston rod moves up and down, thus avoiding dust abrasion and scratches to the internal seals. The inner wall of the cylinder is a key protective design to ensure the sealing of the cylinder and extend the life of the hydraulic system. The bottom of the hydraulic cylinder 9 is welded and fixed with a base reinforcement sleeve 3, which is located at the bottom of the inlet and outlet oil reinforcement sleeve 7. The base reinforcement sleeve 3 is welded to strengthen the structure of the bottom of the cylinder to prevent the cylinder from deforming due to long-term stress. The bottom of the base reinforcement sleeve 3 is horizontally welded with a mounting base 2. The mounting base 2 is provided with cylinder mounting blocks 1 at both ends. The two cylinder mounting blocks 1 are solid metal mounting blocks with a longitudinally penetrating mounting pin hole A4 in the center. Compared with the hollow structure, the solid metal material can withstand greater vertical and lateral impact forces. The mounting pin hole A4 can firmly fix the cylinder to the vehicle chassis to ensure that the cylinder does not shift when it is working and avoid lifting deviation due to unstable fixing.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the hydraulic cylinder 9 has an inlet / outlet reinforcing sleeve 7 near its bottom. The inlet / outlet reinforcing sleeve 7 has an inlet 5 on its left end and an outlet 6 on its right end, both of which are connected to the interior of the hydraulic cylinder 9. The inlet / outlet reinforcing sleeve 7 is welded to the outer wall of the cylinder, strengthening the connection between the inlet / outlet 5, outlet 6, and the cylinder body (preventing cracking of the interface due to high-pressure oil impact) and protecting the oil port joint from material collision damage. Structurally, this reduces the risk of hydraulic oil leakage. The interior of the hydraulic cylinder 9, from top to bottom, consists of a cylinder bottom, piston, piston seal ring, piston rod, cylinder head, and piston rod seal ring. These components work together to achieve oil sealing and power transmission. The cylinder bottom is welded to the inner side of the base reinforcing sleeve 3. A sealing gasket is provided on the inner wall of the cylinder bottom to prevent oil leakage from the bottom of the cylinder and to provide a bottom support surface for the piston, ensuring the piston's downward... When lowering, it will not directly impact the bottom of the cylinder. The piston is welded and fixed to the bottom of the metal piston rod 11. The outer wall of the piston is tightly fitted to the inner wall of the cylinder. A piston sealing ring is fitted on the outside of the piston. This sealing ring can strictly isolate the high-pressure chamber and the low-pressure chamber inside the cylinder to prevent oil from flowing between them and causing pressure loss. This is the core sealing component that ensures lifting force. The cylinder head is located at the top of the cylinder and is fixed to the cylinder body with bolts. In addition to the dustproof ring 10 embedded in the inner wall of the cylinder head, a piston rod sealing ring is also provided. The double sealing structure can not only block the entry of external impurities, but also prevent the oil inside the cylinder from leaking from the gap between the piston rod and the cylinder head, further improving the sealing performance of the cylinder. The oil inlet 5 is directly connected to the lower chamber below the piston, i.e., the high-pressure chamber, and the oil outlet 6 is directly connected to the upper chamber above the piston, i.e., the low-pressure chamber. By controlling the oil flow direction of the oil inlet 5 and the oil outlet 6, the lifting direction of the piston can be precisely controlled.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a top fixing sleeve 12 is welded to the top of the metal piston rod 11. The welding process ensures the connection strength between the two and avoids loosening caused by long-term vibration compared to bolt connection. The top fixing sleeve 12 increases the contact area between the piston rod and the lifting mounting block 13, preventing the top of the piston rod from cracking due to excessive local stress and ensuring more uniform force transmission. The top of the top fixing sleeve 12 is integrally formed with the lifting mounting block 13, which has a mounting pin hole B14 inside. It is hinged to the connecting bracket at the bottom of the hopper through the mounting pin hole B14 (a wear-resistant bushing can be installed in the pin hole). The hinge structure allows the hopper to move flexibly around the pin hole as the piston rod rises and falls, avoiding damage to the hopper or piston rod caused by rigid connection. At the same time, the hopper and piston rod can be separated by simply removing the pin during later maintenance, which is convenient.

[0024] like Figure 1 , Figure 2 and Figure 3As shown, the automatic unloading structure of this building material transport vehicle is based on Pascal's Law (in a closed liquid, pressure is uniformly transmitted in all directions) to achieve power transmission. The complete lifting and unloading process and principle are as follows: During the lifting preparation stage, the vehicle stops and the parking brake is activated, and the cargo bucket is in a horizontal reset state. At this time, the piston in the hydraulic cylinder 9 is located at the bottom of the cylinder body. The oil in the upper chamber of the cylinder body is connected to the hydraulic oil tank through the oil outlet 6. There is no high-pressure oil in the lower chamber, and the piston rod is completely retracted into the cylinder. During the lifting action stage, the hydraulic system is started, and the hydraulic pump pressurizes the hydraulic oil in the oil tank (the working pressure can reach 16-25MPa). The high-pressure oil is transported through the hydraulic pipeline to the oil inlet 5 of the oil inlet and outlet reinforcement sleeve 7. The high-pressure oil is injected into the lower chamber of the cylinder (below the piston) through the oil inlet 5. According to Pascal's Law, the high-pressure oil generates an upward thrust on the piston (thrust = pressure × piston force-bearing area; if the piston diameter is 120mm and the pressure is 20MPa, the thrust can reach 226kN, which is enough to lift a 50-ton cargo bucket). (The bucket and the material), the piston moves upward under the thrust, synchronously driving the metal piston rod 11 to extend upward along the central axis of the cylinder. At this time, the oil in the upper chamber of the cylinder (above the piston) is squeezed by the piston and flows back to the hydraulic oil tank through the oil outlet 6 (low-pressure return, no pressure loss), ensuring that the piston rod rises smoothly. The lifting mounting block 13 at the top of the piston rod drives the bucket to rotate around the hinge point, and the tilt angle of the bucket gradually increases until the material slides out completely under the action of gravity. At this time, the piston rod is fully extended (the cylinder is working at full stroke), and the lifting action is completed. After the unloading is completed, the reversing valve of the hydraulic system switches the direction of oil flow. High-pressure oil is injected into the upper chamber of the cylinder (above the piston) through the oil outlet 6. The high-pressure oil generates downward pressure on the piston, pushing the piston and driving the piston rod to retract downward. At this time, the oil in the lower chamber of the cylinder flows back to the hydraulic oil tank through the oil inlet 5. The piston rod gradually retracts into the cylinder, and the lifting mounting block 13 drives the bucket to descend synchronously until the bucket returns to a horizontal state. The piston returns to the bottom of the cylinder, completing one unloading cycle.

[0025] like Figure 1 and Figure 4As shown, the top fixing sleeve 12 is externally connected to the hydraulic cylinder 9 by a comprehensive protection device 8. The comprehensive protection device 8 includes a semi-circular metal protective sleeve A18 and a semi-circular metal protective sleeve B19. The semi-circular metal protective sleeve A18 is fitted onto the outside of the front half of the hydraulic cylinder 9, and the semi-circular metal protective sleeve B19 is fitted onto the outside of the rear half of the hydraulic cylinder 9. Both are located on top of the inlet / outlet reinforcing sleeve 7. Through the half-splitting design, installation can be completed without disassembling the cylinder. The protective sleeve is made of 3 mm thick Q235 steel plate, which can directly block hard objects such as sand, gravel and steel bars from impacting the cylinder body, avoiding scratches and dents on the cylinder body, while also isolating rainwater from the cylinder body. To reduce the risk of rust and extend the service life of the hydraulic cylinder, thickened metal fixing strips A15 are provided at both ends of the opening of the semi-circular metal protective sleeve A18, and thickened metal fixing strips B16 are provided at both ends of the opening of the semi-circular metal protective sleeve B19. The two thickened metal fixing strips A15 and B16 are fixedly connected by multiple fixing screws 17. The thickened metal fixing strips (thickness can be greater than eight mm) can enhance the splicing strength of the protective sleeve and prevent the protective sleeve from deforming when impacted. Multiple fixing screws 17 (evenly distributed along the fixing strips) ensure that the protective sleeve fits tightly with the outer wall of the hydraulic cylinder and prevents the protective sleeve from shaking and generating noise when the vehicle is running.

[0026] like Figure 1 and Figure 4 As shown, a thickened metal fixing sleeve 20 is welded to the outside of the top fixing sleeve 12. Metal rod fixing blocks 21 are welded to both the front and rear ends of the thickened metal fixing sleeve 20. A lifting protection metal rod 24 is vertically welded to the bottom of each of the two metal rod fixing blocks 21. The thickened metal fixing sleeve 20 strengthens the structural strength of the top fixing sleeve 12, preventing deformation of the top fixing sleeve 12 during the welding of the metal rod fixing blocks 21. The lifting protection metal rod 24 is parallel to the metal piston rod 11 and has the same length as the piston rod, ensuring that the protection rod moves synchronously when the piston rod rises and falls. Lifting protection blocks 23 are vertically welded to the outer wall of the front end of the upper half of the semi-circular metal protective sleeve A18 and the outer wall of the rear end of the upper half of the semi-circular metal protective sleeve B19. Both lifting protection blocks 23 are equipped with... There is a lifting hole 22, and two lifting protective metal rods 24 pass through the lifting hole 22 corresponding to their positions. The inner wall of the lifting hole 22 is polished to reduce the frictional resistance when the protective rod is raised and lowered. The protective rod can move up and down in the lifting hole 22 and move synchronously with the metal piston rod 11. The principle is that the lifting action of the piston rod is transmitted to the protective rod through the linkage of the top fixing sleeve 12, realizing the protection logic of synchronous movement of the piston rod and the protective rod. The bottom end of the lifting protective metal rod 24 is set as a hemisphere. The hemisphere structure can avoid the bottom end from hard collision with the base reinforcement sleeve 3 when the protective rod is fully retracted (reducing impact noise and damage). At the same time, the hemisphere is not easy to accumulate dust (dust can slide naturally along the spherical surface), preventing dust from clogging the lifting hole 22 and causing the protective rod to jam.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic unloading structure for a building material transport vehicle, comprising a hydraulic cylinder (9) and a metal piston rod (11) inserted into the hydraulic cylinder (9), wherein an oil inlet / outlet reinforcing sleeve (7) is provided on the outside of the hydraulic cylinder (9) near its bottom end, and a dustproof ring (10) is also provided on the inner wall of the top of the hydraulic cylinder (9), and the dustproof ring (10) is sleeved on the outside of the metal piston rod (11), wherein the metal piston rod (11) can move up and down in the hydraulic cylinder (9) and the dustproof ring (10), and a top fixing sleeve (12) is welded and fixed on the outside of the top of the metal piston rod (11), and a lifting mounting block (13) is provided on the top of the top fixing sleeve (12), wherein a mounting pin hole B (14) is provided inside the lifting mounting block (13), characterized in that: The top fixing sleeve (12) is externally connected to the hydraulic cylinder (9) with a comprehensive protection device (8). The comprehensive protection device (8) includes a semi-circular metal protective sleeve A (18) and a semi-circular metal protective sleeve B (19). The semi-circular metal protective sleeve A (18) is sleeved on the outside of the front half of the hydraulic cylinder (9), and the semi-circular metal protective sleeve B (19) is sleeved on the outside of the rear half of the hydraulic cylinder (9). Both the semi-circular metal protective sleeve A (18) and the semi-circular metal protective sleeve B (19) are located on the top of the inlet and outlet oil reinforcement sleeve (7).

2. The automatic unloading structure for a building material transport vehicle according to claim 1, characterized in that: The comprehensive protection device (8) also includes thickened metal fixing strip A (15), thickened metal fixing strip B (16) and fixing screws (17). Thickened metal fixing strip A (15) is provided at both ends of the opening of the semi-circular metal protective sleeve A (18), and thickened metal fixing strip B (16) is provided at both ends of the opening of the semi-circular metal protective sleeve B (19). The two thickened metal fixing strips A (15) and the two thickened metal fixing strips B (16) are fixedly connected by multiple fixing screws (17) so that the semi-circular metal protective sleeve A (18) and the semi-circular metal protective sleeve B (19) are fitted and fixed on the outside of the hydraulic cylinder (9).

3. The automatic unloading structure for a building material transport vehicle according to claim 2, characterized in that: The comprehensive protection device (8) also includes a thickened metal fixing sleeve (20), a metal rod fixing block (21), and a lifting protection metal rod (24). The thickened metal fixing sleeve (20) is welded to the outside of the top fixing sleeve (12). The thickened metal fixing sleeve (20) is welded to both the front and rear ends of the thickened metal fixing sleeve (20). The bottom ends of the two metal rod fixing blocks (21) are vertically welded to the lifting protection metal rod (24). The two lifting protection metal rods (24) are arranged parallel to the metal piston rod (11).

4. The automatic unloading structure for a building material transport vehicle according to claim 3, characterized in that: The comprehensive protection device (8) also includes a lifting hole (22) and a lifting protection block (23). The upper half of the semi-circular metal protective sleeve A (18) and the upper half of the rear end of the semi-circular metal protective sleeve B (19) are vertically welded with lifting protection blocks (23). The two lifting protection blocks (23) are provided with lifting holes (22) inside. The two lifting protection metal rods (24) pass through the lifting holes (22) corresponding to their positions.

5. The automatic unloading structure for a building material transport vehicle according to claim 4, characterized in that: The lifting protection metal rod (24) can move up and down in the lifting hole (22), and the metal piston rod (11) will drive the two lifting protection metal rods (24) to move up and down simultaneously during the up and down movement. The bottom end of the lifting protection metal rod (24) is set as a hemisphere, and the length of the lifting protection metal rod (24) is equal to the length of the metal piston rod (11).

6. The automatic unloading structure for a building material transport vehicle according to claim 1, characterized in that: The bottom end of the hydraulic cylinder (9) is welded and fixed with a base reinforcement sleeve (3), and the base reinforcement sleeve (3) is located at the bottom of the inlet and outlet oil reinforcement sleeve (7). The bottom end of the base reinforcement sleeve (3) is horizontally welded with an installation base (2).

7. The automatic unloading structure for a building material transport vehicle according to claim 6, characterized in that: The mounting base (2) is provided with cylinder mounting blocks (1) at both ends. The two cylinder mounting blocks (1) have longitudinally penetrating mounting pin holes A (4) at their center. The cylinder mounting blocks (1) are solid metal mounting blocks.

8. The automatic unloading structure for a building material transport vehicle according to claim 7, characterized in that: The left end of the oil inlet and outlet reinforcement sleeve (7) is provided with an oil inlet (5), and the right end of the oil inlet and outlet reinforcement sleeve (7) is provided with an oil outlet (6). Both the oil inlet (5) and the oil outlet (6) are connected to the inside of the hydraulic cylinder (9).

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