A combined type concrete quality detection rebound hammer

Abstract

The present application relates to a kind of test area combination formula concrete quality detection rebound hammer, including several parallelly arranged test units, for batch testing multiple points, test unit includes shell, slidingly arranged in shell pull rod, with pull rod fixed connection of impact lever, impact hammer and impact tension spring, shell is also provided with sealed tube.The back combination formula electromagnetic power concrete quality detection rebound hammer, can be carried by excavator this rebound hammer, replace the rebound hammer with excavator bucket, can quickly complete high altitude each test area multiple point impact test, and can realize continuous launch impact lever function, not completely rely on artificial, reduce the labor intensity of detection personnel, without high-altitude scaffold, and instrument operation positioning is flexible and accurate, good safety.

Description

Technical Field

[0001] This invention belongs to the field of concrete testing technology, specifically relating to a combined test area concrete quality testing rebound hammer. Background Technology

[0002] A concrete rebound hammer is a testing device suitable for testing the strength of general building components, bridges, and various concrete components (slabs, beams, columns, and cable trays). Its main technical indicators include impact capability; spring stiffness; hammer stroke; maximum static friction force of the pointer system; and the average value of the stiffness calibration. The working principle of the concrete rebound hammer is that a spring drives a hammer to strike the concrete surface via a striking rod. The resulting instantaneous elastic deformation and restoring force cause the hammer to bounce back, and the pointer indicates the rebound distance. The rebound value (the ratio of the rebound distance to the initial distance between the hammer and the striking rod, calculated as a percentage) is used as one of the indicators related to the compressive strength of concrete to estimate its compressive strength.

[0003] Existing rebound hammers are generally single-unit rebound hammers. Throughout the operation of the rebound hammer, attention should be paid to the posture of holding the rebound hammer. One hand should hold the middle part of the rebound hammer to help straighten it; the other hand should hold the tail of the instrument to apply pressure and also help straighten it. This testing method is prone to errors due to improper operation, and it is inefficient when a large number of rebound values ​​need to be tested. Summary of the Invention

[0004] The purpose of this invention is to provide a combined test area concrete quality rebound hammer to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A combined concrete quality testing rebound hammer for testing areas includes several test units connected in parallel, used for batch testing of multiple points within a test area. Each test unit includes a housing, a pull rod slidably disposed within the housing, a striking rod fixedly connected to the pull rod, a striking hammer, a striking spring, and a driving device for driving the pull rod and the striking hammer into the firing position. The surface of the rebound hammer is also provided with a connecting arm for connecting to a hoisting tool, so that the rebound hammer can be hoisted to a high altitude by the hoisting tool to test the concrete.

[0007] As a further optimization of the present invention, a central guide tube is provided inside the housing. The inner side of the central guide tube slides in cooperation with the pull rod. The impact rod is a cylindrical structure with a single open end. One end of the central guide tube slides into the interior of the impact rod. The impact hammer is sleeved on the outside of the central guide tube and is pushed by the impact rod to store force. The impact tension spring is connected between the impact hammer and the housing. The function of the central guide tube is to guide the pull rod and make the pull rod more stable when impacted.

[0008] As a further optimization of the present invention, a buffer spring is provided inside the impact rod, and the impact rod slides by a retaining ring provided at the opening of the housing. The buffer spring is used to delay the impact of the impact rod on the central guide tube when it is bounced back.

[0009] As a further optimization of the present invention, the rebound device further includes a sealing assembly, and a sealing tube is provided inside the housing. The sealing assembly is slidably disposed inside the sealing tube and connected to a pull rod for pulling the pull rod by negative pressure. The driving device is connected to the sealing tube and includes a negative pressure driving chamber. An electromagnet and a sealing plate driven by the electromagnet to change the air pressure are provided inside the negative pressure driving chamber. A guide rail is also provided inside the negative pressure driving chamber to limit the sliding of the sealing plate. An armature corresponding to the electromagnet is provided on the surface of the sealing plate. A return spring for driving the sealing plate to slide in the pressure increase direction is also provided inside the negative pressure driving chamber.

[0010] As a further optimization of the present invention, the negative pressure drive chamber is also provided with an air valve, which is used to eliminate the pressure difference between the inside and outside of the negative pressure drive chamber, so as to prevent the positive and negative pressures caused from affecting the ejection of the ejection rod.

[0011] As a further optimization of the present invention, the sealing assembly includes a first limiting plate and a second limiting plate disposed at the end of the pull rod. A two-section groove of different sizes is provided between the first limiting plate and the second limiting plate. An elastic sealing ring is sleeved in the groove. By setting the two-section groove, the groove is gourd-shaped. When the elastic sealing ring enters the groove section with a larger radius, it is squeezed and pressed against the inner wall of the sealing tube. Under the action of negative pressure, a piston with sealing function is formed between it and the second limiting plate. When the elastic sealing ring enters the groove section with a smaller radius, the elastic sealing ring retracts and does not contact the inner wall of the sealing tube, which helps to prevent friction from affecting the pull rod when it is pushed out.

[0012] As a further optimization of the present invention, a locking mechanism for locking the impact hammer is provided inside the housing. The locking mechanism includes a hinge seat disposed on the surface of the sealing tube and a hinge rod disposed on the hinge seat. One end of the hinge rod is provided with a one-way hook, and the other end is restricted by a toothed rod slidably disposed on the outer surface of the sealing tube. The one-way hook corresponds to a pawl disposed on the surface of the impact hammer to fix the impact hammer. The toothed rod is driven by a transmission structure when the sealing plate is reset to release the restriction of the hinge rod. By providing this locking mechanism, the sealing plate releases the restriction on the hinge rod when it is reset. After the one-way hook is pulled by the impact hammer, it drives the hinge rod to rotate, thereby causing the one-way hook to disengage from the pawl and achieving the effect of automatically releasing the impact hammer.

[0013] As a further optimization of the present invention, the transmission structure includes a slide rod that slides through the housing and the negative pressure drive chamber. A limit ring is provided on the surface of the slide rod to form a one-way valve plate. A rack is provided at one end of the slide rod that enters the housing. The rack and the rack are meshed with the same gear. This transmission structure is driven by the sealing plate when it enters the negative pressure drive chamber, which solves the problem that independent driving is more complicated.

[0014] As a further optimization of the present invention, the surface of the sealing plate is provided with a guide member extending into the sealing tube and a pressing rod provided on the surface of the guide member. The surface of the second limiting plate is provided with a through hole so that the pressing rod enters the through hole and presses the elastic sealing ring into the other end of the slot. This solution switches the elastic sealing ring by moving the sealing plate so that the elastic sealing ring releases its sealing effect and reduces friction after it is separated from the sealing tube, thereby reducing the impact on the pull rod when it is knocked out.

[0015] As a further optimization of the present invention, an indication mechanism is also provided inside the housing. The indication mechanism includes a pointer shaft, a measuring slider and a spring plate. The indication mechanism is a prior art technology, which is used to drive the measuring slider to slide by the rebound of the hammer, thereby measuring the rebound value.

[0016] The beneficial effects of this invention are as follows:

[0017] (1) The combined electromagnetic power concrete quality test rebound hammer of the present invention can be mounted on an excavator. By replacing the excavator bucket with the rebound hammer, it can quickly complete the impact test of multiple points in each test area at high altitude and realize the function of continuous launch of impact rod. It does not rely entirely on manual labor, which reduces the labor intensity of the test personnel, eliminates the need to build scaffolding at high altitude, and the instrument operation and positioning are flexible and accurate with good safety.

[0018] (2) Multiple rods can be moved by negative pressure through a single electromagnet, and the pneumatic drive structure makes up for the short stroke of the electromagnetic drive, resulting in a large pulling stroke of the rods, which is more conducive to measuring the springback value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the test unit of the present invention;

[0021] Figure 3 This is the invention Figure 2 Enlarged view of the structure of section A in the middle;

[0022] Figure 4 This is the invention Figure 2 Enlarged view of the structure of section B;

[0023] Figure 5 This is the invention Figure 2 Enlarged view of the structure of section C;

[0024] Figure 6 This is the invention Figure 4 DD-direction view;

[0025] Figure 7 This is the invention Figure 4 EE direction view;

[0026] Figure 8 This is a schematic diagram illustrating how the present invention is used;

[0027] In the diagram: 1. Test unit; 11. Housing; 12. Sealing tube; 13. Central guide tube; 14. Pull rod; 15. Strike hammer; 16. Claw; 17. Strike rod; 18. Strike spring; 19. Snap ring; 110. Buffer spring; 2. Drive device; 21. Negative pressure drive chamber; 22. Sealing plate; 23. Electromagnet; 24. Armature; 25. Guide rail; 26. Return spring; 27. Air valve; 28. Guide component; 29. ​​Pressing rod; 3. Locking mechanism; 31. Slide 32. Limiting ring; 33. Sealing ring; 34. Rack; 35. Gear; 36. Pinion; 37. Hinge seat; 38. Hinge rod; 39. One-way hook; 4. Sealing assembly; 41. First limiting plate; 42. Second limiting plate; 43. Through hole; 44. Slot; 45. Elastic sealing ring; 46. Protrusion; 5. Indication mechanism; 51. Pointer shaft; 52. Measuring slider; 53. Spring plate; 6. Junction box; 7. Connecting arm; 8. Excavator; 9. Hydraulic arm. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] like Figure 1-8 As shown, a combined concrete quality testing rebound hammer for testing areas includes...

[0031] Several test units 1 are arranged in parallel for batch testing of multiple points. The surface of the rebound hammer is also provided with a connecting arm 7, which is used to connect with the hoisting tool so that the rebound hammer can be sent to the air by the hoisting tool to test the concrete. The test unit 1 includes a housing 11, a tie rod 14 slidably provided in the housing 11, a spring rod 17 fixedly connected to the tie rod 14, a spring hammer 15 and a spring tension spring 18. A sealing tube 12 is also provided in the housing 11.

[0032] The sealing assembly 4 is slidably disposed inside the sealing tube 12 and connected to the pull rod 14, and is used to pull the pull rod 14 by negative pressure.

[0033] The driving device 2, which is connected to the sealing tube 12, includes a negative pressure driving chamber 21, in which an electromagnet 23 is provided and a sealing plate 22 driven by the electromagnet 23 to change the air pressure.

[0034] This solution uses a multi-parallel test unit 1, which can be used by an excavator 8 for batch operations. By using a hybrid electromagnetic and pneumatic drive method, the hammer 15 and the rod 17 are brought into the firing position. Multiple rods 14 can be moved by a single electromagnet 23 through negative pressure. Furthermore, the pneumatic drive structure compensates for the short stroke of the electromagnetic drive, resulting in a large pulling stroke of the rods 14, which is more conducive to measuring the rebound value.

[0035] A central conduit 13 extends coaxially from the sealing tube 12. The inner side of the central conduit 13 slides in conjunction with the pull rod 14. The impact rod 17 is a single-end open cylindrical structure. One end of the central conduit 13 slides into the interior of the impact rod 17. The impact hammer 15 is sleeved on the outside of the central conduit 13 and is pushed by the impact rod 17 to store force. The impact tension spring 18 is connected between the impact hammer 15 and the housing 11. The function of the central conduit 13 is to guide the pull rod 14, making the pull rod 14 more stable during impact. Specifically, as shown... Figure 2 As shown and Figure 5 As shown, the bottom of the pull rod 14 is fixedly connected to the impact rod 17. When the pull rod 14 moves upward, it pulls the impact rod 17 upward, and the upper edge of the impact rod 17 pushes the impact hammer 15 to slide upward, while the central guide tube 13 enters the interior of the impact rod 17 to slide.

[0036] The ejector rod 17 is equipped with a buffer spring 110. The ejector rod 17 is limited to slide by a retaining ring 19 located at the opening of the housing 11. The buffer spring 110 is used to delay the impact of the ejector rod 17 on the central guide tube 13 when it is bounced back.

[0037] The negative pressure drive chamber 21 is also equipped with a guide rail 25 to limit the sliding of the sealing plate 22. The surface of the sealing plate 22 is provided with an armature 24 corresponding to the electromagnet 23. The negative pressure drive chamber 21 is also equipped with a reset spring 26 for driving the sealing plate 22 to slide in the pressurization direction. This solution makes the sliding of the sealing plate 22 more stable by setting the guide rail 25 in the negative pressure drive chamber 21, and resets it by using the reset spring 26 so that the sealing plate 22 can return to the initial position when the electromagnet 23 loses its attraction.

[0038] The negative pressure drive chamber 21 is also equipped with an air valve 27, which is used to eliminate the pressure difference between the inside and outside of the negative pressure drive chamber 21 to prevent the positive and negative pressures from affecting the ejection of the ejection rod 17.

[0039] The sealing assembly 4 includes a first limiting plate 41 and a second limiting plate 42 disposed at the end of the pull rod 14. A two-section groove 44 of varying sizes is provided between the first limiting plate 41 and the second limiting plate 42. An elastic sealing ring 45 is fitted inside the groove 44. By providing the two-section groove 44, such as... Figure 4 As shown, the slot 44 is gourd-shaped. When the elastic sealing ring 45 enters the slot section with a larger radius, the elastic sealing ring 45 is squeezed and pressed against the inner wall of the sealing tube 12. Under the action of negative pressure, a piston with sealing function is formed between it and the second limiting plate 42. When the elastic sealing ring 45 enters the slot section with a smaller radius, it is closer to the first limiting plate 41. The elastic sealing ring 45 retracts without contacting the inner wall of the sealing tube 12, which helps to prevent friction from affecting the operation when the pull rod 14 is pushed out. In order to make the elastic sealing ring 45 return to the section of the slot 44 near the second limiting plate 42 when the sealing assembly 4 moves down, a protrusion 46 is provided on the inner wall of the sealing tube 12 so that the elastic sealing ring 45 can act as a piston again when the sealing tube 12 generates negative pressure next time.

[0040] The housing 11 is provided with a locking mechanism 3 for locking the hammer 15. The locking mechanism 3 includes a hinge seat 37 on the surface of the sealing tube 12 and a hinge rod 38 on the hinge seat 37. One end of the hinge rod 38 is provided with a one-way hook 39, and the other end is restricted by a toothed rod 36 slidably provided on the outer surface of the sealing tube 12. The one-way hook 39 corresponds to the claw 16 provided on the surface of the hammer 15 to fix the hammer 15. The toothed rod 36 is driven by the transmission structure when the sealing plate 22 is reset to release the restriction of the hinge rod 38. By providing this locking mechanism 3, the sealing plate 22 releases the restriction on the hinge rod 38 when it is reset. After the one-way hook 39 is pulled by the hammer 15, it drives the hinge rod 38 to rotate, thereby causing the one-way hook 39 to disengage from the claw, achieving the function of automatically releasing the hammer 15.

[0041] The transmission structure includes a slide rod 31 that slides between the housing 11 and the negative pressure drive chamber 21. A limit ring 32 is provided on the surface of the slide rod 31 to form a one-way valve plate. A rack 34 is provided at the end of the slide rod 31 that enters the housing 11. A gear 35 meshes between the rack 34 and the rack 36. This transmission structure is driven by the sealing plate 22 as it enters the negative pressure drive chamber 21, solving the problem of the complexity of independent drive. Specifically, as shown... Figure 3 As shown, a sealing ring 33 is also provided on the surface of the limiting ring 32. When the sealing plate 22 moves upward, the slide bar 31 moves upward due to pressure, and the corresponding toothed bar 36 slides downward, as shown. Figure 4As shown, the toothed rod 36 slides downwards to abut the upper part of the hinge rod 38, so that the hinge rod 38 cannot rotate clockwise, so that the one-way hook 39 is aligned with the hook 16. Conversely, when the slide rod 31 is pressed down by the sealing plate 22, the toothed rod 36 moves upwards, and the hinge rod 38 can rotate clockwise to make the one-way hook 39 disengage from the hook 16, thereby releasing the spring hammer 15.

[0042] The surface of the sealing plate 22 is provided with a guide member 28 that extends into the sealing tube 12 and a pressing rod 29 that is provided on the surface of the guide member 28. The surface of the second limiting plate 42 is provided with a through hole 43 so that the pressing rod 29 enters the through hole 43 and presses the elastic sealing ring 45 into the other part of the slot 44. This solution switches the elastic sealing ring 45 by moving the sealing plate 22 so that the elastic sealing ring 45 releases its sealing effect and reduces friction after it is separated from the sealing tube 12, thereby reducing the impact on the pull rod 14 when it is knocked out.

[0043] The housing 11 is also provided with an indication mechanism 5, which includes a pointer shaft 51, a measuring slider 52 and a spring plate 53. The indication mechanism is existing technology and is used to drive the measuring slider to slide by the rebound of the hammer, thereby measuring the rebound value.

[0044] It should be noted that for some sliding devices, it is necessary to set limits to prevent them from rotating during sliding. These will not be elaborated here, for example, between the sealing component 4 and the sealing tube 12.

[0045] The specific implementation method is as follows: The test area should be selected on the side of the concrete pouring that allows the rebound hammer to be in a horizontal position. A connecting arm 7 is installed outside the negative pressure drive chamber 21 and connected to the hydraulic arm 9 of the excavator 8. The test device is used to test the concrete. A junction box 6 is also needed to control the relevant electrical components. During use, a negative pressure is created by the movement of the sealing plate 22. The sealing component 4 inside the sealing tube 12 is moved upward by the negative pressure, causing the impact hammer 15 to move in the direction of the impact spring 18's charge, and is restrained by the one-way hook 39, entering the firing position. The excavator 8 controls the... The housing 11 is aligned with the concrete surface. The electromagnet 23 releases the armature 24. Under the push of the return spring 26, the sealing plate 22 quickly rebounds. The elastic sealing ring 45 is pushed to the end of the slot 44 near the second limit plate 41 by the squeezing rod 29. The gas valve 27 is opened to discharge excess gas. Then the sealing plate 22 squeezes the slide bar 31 to unlock the one-way hook 39, completing the firing. When the hammer 15 rebounds, it drives the measuring slider 52 to move by contacting the elastic plate 53. The rebound distance of the measuring slider 52 is recorded by other means to obtain the experimental results.

[0046] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A combined concrete quality testing rebound hammer with test area, characterized in that: It includes several test units (1) connected in parallel to each other, used to test multiple points in the test area in batches. The test unit (1) includes a housing (11), a pull rod (14) slidably disposed in the housing (11), a spring rod (17) fixedly connected to the pull rod (14), a spring hammer (15), a spring tension spring (18), and a drive device (2) for driving the pull rod (14) and the spring hammer (15) into the firing position. The surface of the rebound hammer is also provided with a connecting arm (7), which is used to connect with the hoisting tool so that the rebound hammer can be sent to the high altitude by the hoisting tool to test the concrete. The rebound device also includes a sealing assembly (4), and a sealing tube (12) is provided inside the housing (11). The sealing assembly (4) is slidably disposed inside the sealing tube (12) and connected to a pull rod (14) for pulling the pull rod (14) by negative pressure. The driving device (2) is connected to the sealing tube (12) and includes a negative pressure driving chamber (21). An electromagnet (23) and a sealing plate (22) driven by the electromagnet (23) to change the air pressure are provided inside the negative pressure driving chamber (21). A guide rail (25) is also provided inside the negative pressure driving chamber (21) to limit the sliding of the sealing plate (22). An armature (24) corresponding to the electromagnet (23) is provided on the surface of the sealing plate (22). A reset spring (26) for driving the sealing plate (22) to slide in the pressure increase direction is also provided inside the negative pressure driving chamber (21). An air valve (27) is also provided inside the negative pressure driving chamber (21). The sealing assembly (4) includes a first limiting plate (41) and a second limiting plate (42) disposed at the end of the pull rod (14). A two-section slot (44) of different sizes is provided between the first limiting plate (41) and the second limiting plate (42). An elastic sealing ring (45) is sleeved inside the slot (44). The surface of the sealing plate (22) is provided with a guide member (28) extending into the sealing tube (12) and a pressing rod (29) on the surface of the guide member (28). The surface of the second limiting plate (42) is provided with a through hole (43) so that the pressing rod (29) enters the through hole (43) and presses the elastic sealing ring (45) into the other part of the slot (44). When the elastic sealing ring (45) enters the slot section with a larger radius, the elastic sealing ring (45) is squeezed and pressed against the inner wall of the sealing tube (12). Under the action of negative pressure, a piston with sealing function is formed between it and the second limiting plate (42). When the elastic sealing ring (45) enters the slot section with a smaller radius, it is closer to the first limiting plate (41). The elastic sealing ring (45) retracts and does not contact the inner wall of the sealing tube (12).

2. The combined concrete quality testing rebound hammer according to claim 1, characterized in that: The housing (11) is provided with a central conduit (13). The inner side of the central conduit (13) slides in cooperation with the pull rod (14). The impact rod (17) is a cylindrical structure with a single open end. One end of the central conduit (13) slides into the impact rod (17). The impact hammer (15) is sleeved on the outside of the central conduit (13) and is pushed by the impact rod (17) to store force. The impact spring (18) is connected between the impact hammer (15) and the housing (11).

3. The combined concrete quality testing rebound hammer according to claim 2, characterized in that: The impact rod (17) is equipped with a buffer spring (110) inside, and the impact rod (17) is limited to slide by a retaining ring (19) set at the opening of the housing (11).

4. The combined concrete quality testing rebound hammer according to claim 1, characterized in that: The housing (11) is provided with a locking mechanism (3) for locking the impact hammer (15). The locking mechanism (3) includes a hinge seat (37) provided on the surface of the sealing tube (12) and a hinge rod (38) provided on the hinge seat (37). One end of the hinge rod (38) is provided with a one-way hook (39), and the other end is restricted by a toothed rod (36) slidably provided on the outer surface of the sealing tube (12). The one-way hook (39) corresponds to the claw (16) provided on the surface of the impact hammer (15) to fix the impact hammer (15). The toothed rod (36) is driven by the transmission structure when the sealing plate (22) is reset to release the restriction of the hinge rod (38).

5. A combined concrete quality testing rebound hammer according to claim 4, characterized in that: The transmission structure includes a slide rod (31) that slides through the housing (11) and the negative pressure drive chamber (21). A limit ring (32) is provided on the surface of the slide rod (31) to form a one-way valve plate. A rack (34) is provided at one end of the slide rod (31) that enters the housing (11). The rack (36) and the rack (34) are meshed with the same gear (35).

6. The combined concrete quality testing rebound hammer according to claim 1, characterized in that: The housing (11) is also provided with an indication mechanism (5), which includes a pointer shaft (51), a measuring slider (52), and a spring plate (53).

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