A concrete quality sampling device

Abstract

The application belongs to the technical field of commodity concrete sampling, and specifically discloses a concrete quality sampling device, which comprises a cart, a vertical rod arranged at the front end of the cart, a front-extending U-shaped frame arranged on the vertical rod, a material collecting box elastically connected between the U-shaped frames, a triangular supporting bottom closely and slidably arranged in the material collecting box, a linkage sampling mechanism, a pressure releasing and discharging mechanism and a load bearing adjusting assembly, the linkage sampling mechanism comprises a folding rod rotationally connected with the material collecting box, a connecting rod connected with the folding rod and the triangular supporting bottom, and a material guide groove connected with the folding rod, the pressure releasing and discharging mechanism comprises a blocking strip and a trigger rod arranged at the bottom of the triangular supporting bottom, and the load bearing adjusting assembly comprises a positioning rod arranged on the vertical rod and adjustable in position. The device utilizes the self-weight accumulation of discharged concrete to trigger mechanical linkage, drives the material guide groove to instantaneously intercept concrete and automatically resets, and the whole process does not need external power, so that the device is reliable in structure and realizes unmanned intervention, interval quantitative sampling and cyclic sampling of commodity concrete.

Description

Technical Field

[0001] This invention belongs to the field of commercial concrete sampling inspection technology, specifically referring to a concrete quality sampling inspection device. Background Technology

[0002] Ready-mixed concrete, as the most widely used and fundamental structural material in modern construction projects, directly affects the structural safety, durability, and overall service life of buildings. From its production at the central mixing plant to its transportation to the construction site via concrete mixer trucks, the workability (such as slump) and homogeneity of ready-mixed concrete may change due to factors such as transportation time, road bumps, and variations in ambient temperature and humidity. Therefore, conducting random checks on key performance indicators at the construction site before concrete pouring is a crucial step in ensuring that the project quality meets design requirements and standards.

[0003] To standardize the construction quality of concrete, national or industry standards clearly stipulate the sampling and testing system for concrete. This typically requires sampling in "inspection batches." For example, after a certain amount of concrete is unloaded, a sample of the concrete is taken as an inspection batch, and test blocks are made from the sampled concrete to evaluate its mechanical properties. The purpose of this mandatory regulation is to establish a quality monitoring system covering the entire construction process.

[0004] However, in current engineering practice, the implementation of the above sampling specifications mainly relies on traditional manual operations. Specifically, on-site quality inspectors or construction workers typically use simple tools such as shovels, sampling spades, or sampling buckets to scoop or shovel a certain amount of concrete as a sample from the concrete flowing out of the concrete mixer truck during unloading. This long-standing sampling method has several inherent drawbacks that are difficult to overcome:

[0005] Ideally, sampling should be conducted during the unloading process, taking samples from each batch of concrete after a certain amount has been unloaded. However, manual, single-point, and arbitrary sampling cannot achieve precise quantitative control, and therefore cannot accurately reflect the inspection batches required by the specifications. This results in subsequent slump tests or test block strength assessments lacking representativeness, posing a serious hidden danger to project quality.

[0006] Manual sampling is not only labor-intensive and inefficient, but also poses significant safety risks when operating near large machinery. Furthermore, the timing, location, and frequency of sampling depend entirely on the operator's subjective judgment, lacking standardized quantification, resulting in substantial management loopholes in the quality control process.

[0007] Due to the lack of automated recording and constraint mechanisms, the manual sampling process is difficult to trace and supervise effectively. Violations such as "symbolic sampling" or "missed detection" are difficult to eliminate, resulting in a significant reduction in the actual implementation of national mandatory standards and failing to truly play the role of a quality "firewall". Summary of the Invention

[0008] In response to the above situation, the present invention provides a concrete quality sampling inspection device. It utilizes the cumulative weight of the unloaded concrete to trigger mechanical linkage, drive the guide chute to instantly intercept the concrete and automatically reset it. The entire process requires no external power source, the structure is reliable, and it realizes unmanned, interval quantitative, and cyclic sampling of commercial concrete, ensuring the representativeness and impartiality of the samples, and significantly improving the safety and efficiency of on-site operations.

[0009] The technical solution adopted by the present invention is as follows: The present invention proposes a concrete quality sampling inspection device, including a trolley, the front end of which is provided with a vertical pole, and the vertical pole is provided with a forward-extending C-shaped frame.

[0010] Furthermore, it includes a collection box that is flexibly connected between the C-shaped frames and a triangular support that is slidably installed inside the collection box, as well as a linkage sampling mechanism, a pressure relief and unloading mechanism, and a load-bearing adjustment component.

[0011] Furthermore, the linkage sampling mechanism includes a folding rod rotatably connected to the collection box, a connecting rod connecting the folding rod and the triangular support base, and a guide trough connected to the folding rod.

[0012] Furthermore, the pressure relief and unloading mechanism includes a stop bar and a trigger rod located at the bottom of the triangular support base. The stop bar is used to engage detachably with a locking frame located at the bottom of the collection box.

[0013] Furthermore, the load-bearing adjustment component includes a positioning rod that is mounted on the upright and is position-adjustable. The positioning rod is used to abut against the trigger rod when the material collection box sinks under load, thereby triggering the pressure relief and unloading mechanism.

[0014] Furthermore, the side wall of the collection box is provided with a first positioning shaft and a limiting member. The middle part of the folding rod is rotatably connected to the first positioning shaft. One end of the folding rod is rotatably connected to the upper end of the connecting rod and is blocked and limited by the limiting member. The bottom of the triangular support is provided with a second positioning shaft, and the lower end of the connecting rod is rotatably connected to the second positioning shaft.

[0015] Furthermore, the bottom of the triangular support is fixedly provided with a retaining rail, the stop bar is horizontally slidably disposed in the retaining rail, the inner end of the stop bar is provided with a fifth spring seat, a second tension spring is connected between the fifth spring seat and the retaining rail, and the trigger rod is fixedly connected to the fifth spring seat and extends toward the positioning rod.

[0016] Furthermore, the load-bearing adjustment assembly also includes a lifting sleeve sleeved on the upright and a positioning knob threaded through the lifting sleeve and abutting against the upright, wherein the lifting sleeve is fixedly connected to the positioning rod.

[0017] Furthermore, the shaped frame is provided with a first spring seat, the first spring seat is provided with a first slot, the side wall of the collection box is fixedly provided with a clip, the clip is vertically slidably engaged in the first slot, the lower end of the clip is provided with a second spring seat, and a first tension spring is connected between the first spring seat and the lower second spring seat.

[0018] Furthermore, a second slot is provided on the vertical surface of the triangular support base, a locking block is provided on the inner wall of the collection box to slide in the second slot, a third spring seat is provided on the outer wall of the collection box, a fourth spring seat is provided at the bottom of the triangular support base, and a pre-tension spring is connected between the third spring seat and the fourth spring seat.

[0019] Furthermore, the upper edge of the end of the stop bar facing the card frame is chamfered; when the triangular support rises and resets, the chamfer of the stop bar abuts against the lower edge of the card frame, thereby being guided to retract and finally locked into the card frame.

[0020] Furthermore, the side of the positioning rod facing the trigger rod has chamfers on both its upper and lower edges; the trigger rod can contact the upper chamfer of the positioning rod when it descends, and the trigger rod contacts the lower chamfer of the positioning rod when it rises from the bottom to reset.

[0021] Furthermore, the cross-section of the triangular support is an isosceles triangle, and its bottom is a horizontal plane; when the fourth spring seat is in close contact with the lower end of the collection box, the bottom surface of the triangular support is flush with the lower end of the collection box.

[0022] Furthermore, when the collection box is in its initial unloaded position, the guide chute is vertical and away from the top of the collection box; when the triangular support sinks relative to the collection box and drives the folding rod to rotate around the first positioning axis, the guide chute can swing to the top of the collection box and tilt away from the trolley.

[0023] The beneficial effects achieved by the present invention using the above structure are as follows:

[0024] (1) This invention realizes fully automatic cyclic sampling without human intervention. Its working principle is to cleverly use the self-weight of the concrete discharged into the aggregate box as the driving source. When the weight accumulates and the aggregate box sinks to the preset position, the trigger rod on it will make mechanical contact with the fixed positioning rod, automatically triggering the pressure relief unloading mechanism and the linkage sampling mechanism. The whole process does not require manual judgment or operation, completely abandoning the traditional manual sampling method. It not only liberates quality inspectors from heavy and dangerous physical labor and eliminates operational safety hazards, but also fundamentally solves the problems of subjective arbitrary sampling and missed detection caused by human factors.

[0025] (2) The present invention has precise quantitative adjustment capability. By rotating the positioning knob to adjust the height of the positioning rod on the upright in the load-bearing adjustment component, the concrete weight threshold required to trigger sampling can be easily set. This design enables the sampling operation to be carried out strictly in accordance with the "inspection batch" standard required by different projects and different specifications, ensuring that sampling is performed after unloading a certain amount of concrete, thereby ensuring the representativeness of the sample and the effectiveness of subsequent quality assessment, and solving the core defects of the background technology that the sampling amount cannot be controlled and is not representative.

[0026] (3) The present invention achieves the mandatory and high reliability of the sampling process. Once the device is deployed in the unloading process, its sampling action is physically bound to the unloading process of concrete. As long as concrete is unloaded into the aggregate box and reaches the set weight, the sampling action will inevitably occur. It cannot be skipped or interfered with by human. This is due to its pure mechanical structure design. The entire linkage process is driven only by levers, springs and gravity, without any power supply or electronic components. This design is not only reliable in principle and not prone to failure, but also perfectly adaptable to the harsh environment of the construction site with dust, humidity and vibration, ensuring that the quality monitoring specifications are implemented without compromise. Attached Figure Description

[0027] Figure 1 This is a first three-dimensional structural schematic diagram of a concrete quality sampling inspection device proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the second three-dimensional structure of a concrete quality sampling inspection device proposed in this invention.

[0029] Figure 3 This is a schematic diagram of the exploded structure of a concrete quality sampling inspection device proposed in this invention.

[0030] Figure 4 This is a schematic diagram of the aggregate box of a concrete quality sampling inspection device proposed in this invention.

[0031] Figure 5 This is a schematic diagram of the triangular support base of a concrete quality sampling inspection device proposed in this invention.

[0032] Figure 6 for Figure 5 Enlarged view of section A in the middle.

[0033] Figure 7 This is a structural schematic diagram of the load-bearing adjustment component of a concrete quality sampling inspection device proposed in this invention.

[0034] Figure 8 This is a structural schematic diagram showing the positional relationship between the trigger rod and the positioning rod of a concrete quality sampling inspection device proposed in this invention.

[0035] Figure 9 This is an initial state diagram of a concrete quality sampling inspection device proposed in this invention.

[0036] Figure 10 This is a motion trajectory diagram of a concrete quality sampling inspection device proposed in this invention.

[0037] The components include: 1. trolley; 11. upright; 12. C-shaped frame; 2. first spring seat; 21. first slot; 22. first tension spring; 3. collection box; 31. locking strip; 32. second spring seat; 33. third spring seat; 34. locking block; 35. first positioning shaft; 36. limiting component; 37. locking frame; 4. triangular support base; 41. second slot; 42. fourth spring seat; 43. pre-tension spring; 44. second positioning shaft; 5. linkage sampling mechanism; 51. folding rod; 52. connecting rod; 53. guide chute; 6. pressure relief and unloading mechanism; 61. rail; 62. stop bar; 63. fifth spring seat; 64. second tension spring; 65. trigger rod; 7. load-bearing adjustment assembly; 71. lifting sleeve; 72. positioning rod; 73. positioning knob.

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, the present invention proposes a concrete quality sampling inspection device, including a trolley 1 as a mobile platform. The trolley 1 is equipped with a counterweight in the middle to balance the center of gravity of the whole machine and ensure stability when the front core component is carrying concrete. Two vertical poles 11 are symmetrically arranged at the front end of the trolley 1. The upper end of the poles 11 is fixedly connected to a forward-extending C-shaped frame 12. The C-shaped frame 12 provides an installation base for the subsequent core sampling mechanism. In order to facilitate the placement of equipment such as the receiving hopper, no structure is set in the area near the ground below the C-shaped frame 12.

[0042] The core components of this invention include a collection box 3 that is elastically suspended between the C-shaped frames 12, a triangular support 4 that can slide and fit tightly inside the collection box 3, a linkage sampling mechanism 5 that is linked with the collection box 3 and the triangular support 4, a pressure relief and unloading mechanism 6 for releasing the triangular support 4, and a load-bearing adjustment component 7 for setting the trigger weight.

[0043] Specifically, in order to achieve the elastic suspension and vertical lifting of the collection box 3, a first spring seat 2 is provided at the end of the C-shaped frame 12. A vertical first slot 21 is opened on the first spring seat 2. A corresponding locking strip 31 is fixed on the side wall of the collection box 3. The locking strip 31 slides vertically in the first slot 21, thereby constraining the collection box 3 between the C-shaped frame 12 to perform purely vertical movement. A second spring seat 32 is provided at the lower end of the locking strip 31. The second spring seat 32 is located below the first spring seat 2. A first tension spring 22 is connected between the first spring seat 2 and the second spring seat 32. In the initial state, the elastic force of the first tension spring 22 lifts the collection box 3 upward as a whole.

[0044] The aggregate box 3 is a box structure with open top and bottom ends. The triangular support base 4 has an isosceles triangle cross section to prevent residue from being generated during concrete unloading. Its bottom is horizontal and serves as the movable bottom of the aggregate box 3. To ensure that the triangular support base 4 can be stably raised and lowered vertically within the aggregate box 3, a second slot 41 is provided on the vertical surface of the triangular support base 4. The inner wall of the aggregate box 3 is provided with a locking block 34 that slides with the second slot 41. To achieve automatic reset of the triangular support base 4, a third spring seat 33 is provided on the outer wall of the aggregate box 3, and a fourth spring seat 42 is provided at the bottom of the triangular support base 4. A pre-tension spring 43 is connected between the third spring seat 33 and the fourth spring seat 42. The pre-tension spring 43 has a certain pre-tension force at its initial length, which can lift the triangular support base 4 upward so that its bottom surface is flush with the lower opening of the aggregate box 3 and is locked and limited by the structure of the fourth spring seat 42.

[0045] The linkage sampling mechanism 5 includes a folding rod 51, a connecting rod 52, and a guide trough 53. Two opposite side walls of the collection box 3 are provided with a first positioning shaft 35 and a limiting member 36. The middle part of the folding rod 51 is rotatably connected to the first positioning shaft 35. One end of the folding rod 51 is rotatably connected to the upper end of the connecting rod 52. When this end rotates, it will be blocked by the limiting member 36 below, thereby limiting its rotation range and preventing the triangular support base 4 from detaching from the collection box 3. The bottom of the triangular support base 4 is provided with a second positioning shaft 44. The lower end of the connecting rod 52 is rotatably connected to the second positioning shaft 44. The other end of the folding rod 51 is fixedly connected to the guide trough 53.

[0046] The pressure relief and unloading mechanism 6 is located at the bottom of the triangular support base 4. The bottom of the triangular support base 4 is fixedly provided with a retaining rail 61. A stop bar 62 is horizontally slidably provided inside the retaining rail 61. A fifth spring seat 63 is fixed at the inner end of the stop bar 62. A second tension spring 64 is connected between the fifth spring seat 63 and the retaining rail 61. This spring causes the stop bar 62 to tend to extend outward in the normal state. A trigger rod 65 extending outward is also fixed on the fifth spring seat 63. The lower end of the collection box 3 is provided with a retaining frame 37 that cooperates with the stop bar 62. In the initial state, the stop bar 62 extends outward under the action of the second tension spring 64 and is locked into the retaining frame 37, thereby locking the triangular support base 4 at the bottom of the collection box 3. In order to facilitate reset, the upper edge of the end of the stop bar 62 facing the retaining frame 37 is chamfered.

[0047] The load-bearing adjustment component 7 is used to set the threshold of the concrete unloading weight that triggers sampling. The component includes a lifting sleeve 71 sleeved on the upright 11 and a positioning knob 73 threaded through the lifting sleeve 71 and able to press against the upright 11. By loosening or tightening the positioning knob 73, the height of the lifting sleeve 71 on the upright 11 can be adjusted and locked. A positioning rod 72 is fixedly connected to the lifting sleeve 71. In order to ensure the smoothness of the triggering and resetting process, the upper and lower edges of the side of the positioning rod 72 facing the trigger rod 65 are chamfered.

[0048] The specific work process is as follows:

[0049] Step 1, Initial State and Preparation: Move the trolley 1 to below the discharge port of the concrete mixer truck. Place the receiving hoppers for construction below the two inclined surfaces of the triangular support base 4. Place the collection component for sampling below the inclined flow direction of the guide chute 53. In the initial state, the aggregate box 3 is empty of concrete and is at its lightest weight. The first tension spring 22 is in a contracted state, lifting the aggregate box 3 to its highest position. At the same time, the pre-tension spring 43 also lifts the triangular support base 4 relative to the aggregate box 3 to its highest position, making its bottom surface flush with the bottom opening of the aggregate box 3. At this time, the stop bar 62 of the pressure relief unloading mechanism 6, under the action of the second tension spring 64, is locked into the retaining frame 37 at the bottom of the aggregate box 3, firmly locking the triangular support base 4. The guide chute 53 of the linkage sampling mechanism 5 is naturally vertical due to its connection position, away from the discharge port, and does not affect the normal concrete unloading.

[0050] Step 2, Load-bearing sinking and triggering: Unloading begins, and concrete enters the aggregate box 3 from the unloading port. As the amount of concrete increases, the total weight of the aggregate box 3 and the triangular support 4 gradually increases. This gravity overcomes the tension of the first tension spring 22, causing the entire aggregate box 3, along with its internal components, to sink vertically along the direction of the upright 11. During this process, since the triangular support 4 and the aggregate box 3 are locked by the stop bar 62, their relative positions remain unchanged. Therefore, the components of the linkage sampling mechanism 5 (bending rod 51, connecting rod 52, and guide chute 53) do not rotate relative to each other. When the aggregate box 3 sinks to the preset depth, the front end of the trigger rod 65 contacts the upper chamfered slope of the positioning rod 72 in the load-bearing adjustment component 7. As the sinking continues, the slope of the positioning rod 72 will exert an inward squeezing force on the trigger rod 65. This force drives the fifth spring seat 63 to move inward against the tension of the second tension spring 64, thereby causing the stop bar 62 to disengage from the clip frame 37.

[0051] Step 3, Instant Unloading and Sampling: The instant the stop bar 62 disengages from the frame 37, the lock between the triangular support base 4 and the aggregate box 3 is released. At this moment, the enormous weight of the concrete on the triangular support base 4 causes it to accelerate downwards instantly, and the trigger rod 65 also descends below the positioning rod 72. This process produces two linkage effects: First, after the triangular support base 4 falls, most of the concrete on its two isosceles triangular inclined surfaces slides rapidly down the inclined surfaces and enters the two pre-set construction receiving hoppers below; second, the triangular support... The rapid descent of the base 4 causes the connecting rod 52 to move downward via the second positioning shaft 44. The downward movement of the connecting rod 52 pulls the folding rod 51 to rotate around the first positioning shaft 35. The rotation of the folding rod 51 causes the guide trough 53 at its other end to swing rapidly to below the discharge port and be in an inclined state. At this time, the concrete flowing out of the discharge port of the mixer truck is intercepted by the guide trough 53 and guided along its inclined bottom to the sampling and collection component on the side. The rotation of the folding rod 51 will eventually be blocked by the limiting component 36, thereby limiting the descent stroke of the triangular support base 4.

[0052] Step 4, Automatic Reset: As the concrete on the triangular support base 4 is rapidly emptied, and the guide chute 53 cuts off new concrete from entering the aggregate box 3, the total weight of the entire moving part decreases sharply. At this time, the elastic force of the first tension spring 22 is greater than the remaining weight, lifting the aggregate box 3 upwards as a whole. Simultaneously, the pre-tension spring 43 also begins to act, pulling the triangular support base 4 upwards relative to the aggregate box 3. During the upward reset process, the trigger rod 65 will encounter the lower chamfered slope of the positioning rod 72. This slope guides the trigger rod 65 to... The triangular support 4 retracts inward, smoothly passing over the positioning rod 72 and returning to its upper position. When the triangular support 4 is about to return to its initial position, the upper chamfer of its stop bar 62 will contact the lower edge of the frame 37 and be guided to retract inward. After passing over the frame 37, it will automatically pop out under the action of the second tension spring 64 and re-lock into the frame 37. At the same time, as the triangular support 4 rises, the connecting rod 52 pushes the bending rod 51 to rotate in the opposite direction, driving the guide chute 53 away from the discharge port and returning to its initial vertical state.

[0053] At this point, a complete cycle of "unloading a specific amount of concrete - triggering - sampling - resetting" is completed. The device automatically returns to its initial state and begins the next round of concrete loading, thus achieving periodic automatic sampling.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0056] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A concrete quality sampling inspection device, comprising a trolley (1), wherein a vertical pole (11) is provided at the front end of the trolley (1), and a forward-extending U-shaped frame (12) is provided on the vertical pole (11), characterized in that: It includes a collection box (3) that is flexibly connected between the C-shaped frame (12) and a triangular support (4) that is tightly slidably disposed in the collection box (3), as well as a linkage sampling mechanism (5), a pressure relief and unloading mechanism (6) and a load-bearing adjustment component (7). The linkage sampling mechanism (5) includes a folding rod (51) rotatably connected to the collection box (3), a connecting rod (52) connecting the folding rod (51) and the triangular support (4), and a guide trough (53) connected to the folding rod (51). The pressure relief and unloading mechanism (6) includes a stop bar (62) and a trigger rod (65) located at the bottom of the triangular support (4). The stop bar (62) is used to engage with the clip frame (37) located at the bottom of the collection box (3) in a disengaged manner. The load-bearing adjustment component (7) includes a positioning rod (72) mounted on the upright (11) and whose position is adjustable. The positioning rod (72) is used to abut against the trigger rod (65) when the aggregate box (3) sinks under the load, thereby triggering the pressure relief and unloading mechanism (6). The bottom of the triangular support (4) is fixedly provided with a rail (61), the baffle (62) is horizontally slidably provided in the rail (61), the inner end of the baffle (62) is provided with a fifth spring seat (63), a second tension spring (64) is connected between the fifth spring seat (63) and the rail (61), and the trigger rod (65) is fixed to the fifth spring seat (63) and extends toward the positioning rod (72); The shaped frame (12) is provided with a first spring seat (2), and a first slot (21) is provided on the first spring seat (2). A clip (31) is fixed on the side wall of the collection box (3). The clip (31) is vertically slidably fitted in the first slot (21). A second spring seat (32) is provided at the lower end of the clip (31). A first tension spring (22) is connected between the first spring seat (2) and the lower second spring seat (32).

2. The concrete quality sampling inspection device according to claim 1, characterized in that: The side wall of the collection box (3) is provided with a first positioning shaft (35) and a limiting member (36). The middle part of the folding rod (51) is rotatably connected to the first positioning shaft (35). One end of the folding rod (51) is rotatably connected to the upper end of the connecting rod (52) and blocked and limited by the limiting member (36). The bottom of the triangular support (4) is provided with a second positioning shaft (44). The lower end of the connecting rod (52) is rotatably connected to the second positioning shaft (44).

3. The concrete quality sampling inspection device according to claim 2, characterized in that: The load-bearing adjustment assembly (7) also includes a lifting sleeve (71) sleeved on the upright (11) and a positioning knob (73) threaded through the lifting sleeve (71) and abutting against the upright (11). The lifting sleeve (71) is fixedly connected to the positioning rod (72).

4. The concrete quality sampling inspection device according to claim 3, characterized in that: A second slot (41) is provided on the vertical surface of the triangular support (4), a locking block (34) is provided on the inner wall of the collection box (3) to slide with the second slot (41), a third spring seat (33) is provided on the outer wall of the collection box (3), a fourth spring seat (42) is provided at the bottom of the triangular support (4), and a pre-tension spring (43) is connected between the third spring seat (33) and the fourth spring seat (42).

5. A concrete quality sampling inspection device according to claim 4, characterized in that: The upper edge of the end of the baffle (62) facing the card frame (37) is chamfered; when the triangular support (4) rises and resets, the chamfer of the baffle (62) abuts against the lower edge of the card frame (37), thereby being guided to shrink and finally inserted into the card frame (37).

6. A concrete quality sampling inspection device according to claim 5, characterized in that: The positioning rod (72) facing the trigger rod (65) has chamfers on both its upper and lower edges; the trigger rod (65) can contact the upper chamfer of the positioning rod (72) when it descends, and the trigger rod (65) contacts the lower chamfer of the positioning rod (72) when it rises from the bottom to reset.

7. A concrete quality sampling inspection device according to claim 6, characterized in that: The cross section of the triangular support (4) is an isosceles triangle, and its bottom is a horizontal plane; when the fourth spring seat (42) is in close contact with the lower end of the collection box (3), the bottom surface of the triangular support (4) is level with the lower end of the collection box (3).

8. A concrete quality sampling inspection device according to claim 7, characterized in that: When the collection box (3) is in the initial unloaded position, the guide chute (53) is vertical and away from the upper end of the collection box (3); when the triangular support (4) sinks relative to the collection box (3) and drives the folding rod (51) to rotate around the first positioning axis (35), the guide chute (53) can swing to the top of the collection box (3) and tilt away from the trolley (1).

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