A mobile assembled drop weight impact test device and installation method

Abstract

The present invention relates to a mobile assembled drop hammer impact test device and an installation method, and belongs to the technical field of impact resistance performance testing. The device includes a test bench, a drop hammer and a force sensor; the test bench is composed of a channel steel base, a guide rail, a support rod and a steel beam, and the channel steel base is composed of four channel steels; the guide rail is vertically arranged on the channel steel base, and a convex connecting plate is provided on the guide rail at a certain distance, and a rectangular groove is provided on the convex connecting plate; the steel beam is clamped between the guide rails and can slide up and down along the groove of the guide rail; one end of the support rod is inserted into the rectangular groove, and the other end is inserted into the slot on the steel pad laid on the ground; the drop hammer is fixed on the steel beam, and the force sensor is fixed on the lower surface of the drop hammer. Compared with the traditional assembled structure, many parts of the device are easy to obtain at the construction site, and on-site tests can be carried out in combination with the on-site conditions, reducing transportation costs, reducing risks, improving economic benefits, and bringing convenience.

Description

Technical Field

[0001] The invention relates to a mobile assembled drop hammer impact test device and an installation method, belonging to the technical field of impact resistance performance testing. Background Art

[0002] In many developed countries, prefabricated buildings are the most important way of building industrialization, which has many advantages such as improving quality, shortening construction period, saving energy, reducing consumption, clean production, etc. In response to the call of the country for new urbanization construction with people as the core, the industrialization of prefabricated buildings will be pushed to a new stage.

[0003] The drop hammer impact test is a method to determine the response of concrete components under impact loads. Many tests at home and abroad are carried out in laboratories. Traditional test methods make it difficult to ensure that the impact hammer's landing point is accurately aligned with the center of the floor slab every time it falls; after the impact hammer falls, it will produce irregular secondary impacts, posing a certain threat to the experimenter.

[0004] Among the existing drop hammer impact test devices, a fixed pulley drop hammer impact test device is disclosed in the Chinese invention patent specification CN106290013A, which includes two pairs of support frames, guide sleeves, push rods, and connecting rods (impact hammers). Among them, the support frame is composed of a vertical support column and two oblique support columns in the same plane, and the top is connected by a push rod. The two guide sleeves are connected by a connecting rod and are respectively sleeved on the vertical support columns. An impact hammer is provided at the center of the bottom of the connecting rod, and a fixed pulley is provided at the bottom of the push rod. The pull rope passes through the pulley and the connecting rod to pull the connecting rod. Although this invention patent ensures the consistency of the test height, the sleeve ensures that the landing point of the impact hammer can be accurately centered to reduce irregular secondary impacts. However, when the impact force is large, the support column will produce a large deformation in the direction of the connecting rod connection, which will cause the landing point to produce an error in this direction. The support frame and the base plate are non-detachably connected,

[0005] A drop hammer impact test device is disclosed in the Chinese invention patent specification CN205981946U, including an impact frame, an impact hammer and an impact ball. A detachable positioning device is provided on the top of the chassis of the impact frame, which is composed of four baffles and a protective plate overlapped with each other. The baffle surrounds the impacted specimen placed on the chassis and positions the specimen. The protective plate is arranged at a certain distance above the specimen and positions the impact ball. The impact ball is located directly below the impact hammer and contacts the top of the impact specimen. This invention patent can accurately and quickly position the specimen and the impact ball and find the center of the drop, but the latch of the sleeve is inconvenient to operate and may cause danger to the experimenter.

[0006] A drop hammer impact test method suitable for testing concrete beam specimens and disc specimens is disclosed in the Chinese invention patent specification CN104897492A. It includes a drop hammer, a test bench, a laser speed measurement system, a displacement monitoring system, an electronic counter, an impact force collection system, and a displacement base. The drop hammer guide cylinder in the test bench is a transparent circular vertical cylinder, which is connected to the vertical pole by four short rods and four fastening bolt sleeves and can move up and down. The drop hammer hits the force transfer ball along the guide cylinder. The vertical pole and the steel plate base are fixed and marked with scales. The force transfer ball is placed in the positioner, and the bottom is in contact with the top of the specimen. There is a force transfer plate at the bottom of the specimen, and the dynamic pressure sensor is arranged between the force transfer plate and the steel bottom plate. This invention patent can find the drop center, ensure the level of the test bench, and the free fall distance, drop hammer impact speed, specimen mid-span displacement, and impact force can be measured. However, when the drop hammer weight is large, the pulley operation is difficult. The bottom plate cannot be disassembled and is inconvenient to move. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the main technical problem solved by the present invention is to provide a movable and detachable drop hammer impact test device that can accurately obtain the impact kinetic energy absorbed by a concrete floor under repeated impact loads.

[0008] The technical solution proposed by the present invention to solve the above technical problems is: a mobile assembled drop hammer impact test device, including a test bench, a drop hammer and a force sensor; the test bench is composed of a channel steel base, a guide rail, a support rod and a steel beam, the channel steel base is composed of four channel steels, a trapezoidal pad is provided at the bottom of the channel steel base, and a universal wheel clamp is provided on the channel steel at a certain distance; the guide rail is vertically arranged on the channel steel base, and a convex connecting plate is provided on the guide rail at a certain distance, and a rectangular groove is provided on the convex connecting plate; the steel beam is clamped between the guide rails and can slide up and down along the groove of the guide rail, and a long screw with a ring is provided on the top surface of the steel beam, and the long screw with a ring is connected to a remote control unhooking device; one end of the support rod is inserted into the rectangular groove, and the other end is inserted into the slot on the steel pad laid on the ground; the drop hammer is fixed on the steel beam, and the force sensor is fixed on the lower surface of the drop hammer.

[0009] A further improvement of the above scheme is that: a transverse screw hole is respectively provided at both ends of the steel beam, a long bolt is passed through the screw hole, a roller is provided on the long bolt, and the steel beam is clamped in the groove of the guide rail through the roller.

[0010] A further improvement of the above solution is that the channel steels are reinforced by channel steel connectors.

[0011] A further improvement of the above scheme is: a detachable hanging rod is provided at the top of the guide rail, a steel plate support is installed between the guide rails, the steel plate support is located below the hanging rod, a fixing frame and a displacement meter are arranged on the steel plate support, and the displacement meter is fixed on the fixing frame.

[0012] A further improvement of the above solution is that: the universal wheel clamp is connected to a universal wheel module, and the universal wheel module can adjust the angle on the vertical plane.

[0013] A further improvement of the above scheme is that the drop weight is fixed to the steel beam by a reinforcing nut, and the remote control unhooking device is suspended by a steel cable or a rope.

[0014] The present invention also provides an installation method of a mobile assembled drop weight impact test device, and the installation method comprises the following steps:

[0015] Step 1: Assemble the universal wheel fixture on the channel steel and install the connecting plate on the guide rail;

[0016] Step 2: The guide rails are fixedly mounted on the channel steels, and the suspension rods are mounted on the top ends between the guide rails;

[0017] Step 3: insert one end of the support rod into the slot on the steel backing plate, and insert the other end of the support rod into the rectangular groove;

[0018] Step 4: Assemble the channel steels using the channel steel connectors to form the channel steel base;

[0019] Step 5: The steel beam is installed on the guide rail, the drop weight is suspended and installed in the middle section of the steel beam, and the force sensor is installed below the drop weight.

[0020] Step 6: Connect the bottom end of the steel cable or rope to the remote control unhooking device.

[0021] Step seven: Install the steel plate support onto the connecting plate of the guide rail, and arrange the displacement meter on the steel plate support.

[0022] The beneficial effects of the present invention are:

[0023] (1) The device adopts detachable universal wheels, which is easy to move, reduces the disassembly process and is easy to assemble.

[0024] (2) The device has a simple structure and uses components that can be freely disassembled and assembled. It is suitable for floors of different heights and sizes and different terrains.

[0025] (3) Compared with traditional prefabricated structures, many components of this device are easy to obtain at the construction site, and on-site tests can be carried out based on on-site conditions, thereby reducing transportation costs, lowering risks, improving economic benefits, and bringing convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of embodiment 1 of the present invention.

[0027] Figure 2 It is a front view of the drop weight and the steel beam of Example 1 of the present invention.

[0028] Figure 3 1 is a top view of the drop weight and the steel beam of Example 1 of the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the steel beam and the guide rail of Example 1 of the present invention.

[0030] Figure 5 It is a schematic structural diagram of the guide rail and channel steel connecting piece of embodiment 1 of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the support rod and the steel pad of Example 1 of the present invention.

[0032] Figure 7 It is a schematic diagram of the structure of the steel pad of Example 1 of the present invention.

[0033] Figure 8 It is a schematic structural diagram of the universal wheel clamp of Example 1 of the present invention.

[0034] Fig. 9 It is a schematic structural diagram of the channel steel base of Example 1 of the present invention.

[0035] Fig.10 It is a schematic structural diagram of the force sensor of Example 1 of the present invention.

[0036] Fig.11 It is a schematic structural diagram of the suspension rod of Example 1 of the present invention.

[0037] Fig.12 It is a schematic diagram of the installation of the steel plate support of Example 1 of the present invention.

[0038] Fig.13 It is a schematic structural diagram of a steel plate support according to Example 1 of the present invention.

[0039] Fig.14 It is a schematic structural diagram of the displacement meter and the fixing bracket of Example 1 of the present invention.

[0040] Numbers in the figure: drop weight 1, steel beam 2, long screw with ring 3, roller 4, force sensor 5, guide rail 6, channel steel connector 7, convex connecting plate 8, support rod 9, steel pad 10, slot 11, channel steel base 12, universal wheel clamp 13, universal wheel module 14, reinforcement nut 15, suspension rod 16, displacement meter 17, fixing bracket 18, steel plate support 19. DETAILED DESCRIPTION

[0041] The following, with reference to the accompanying drawings, describes the embodiments to further illustrate the specific implementation methods of the present invention, such as the relative positions and connection relationships between the various parts involved, the functions and working principles and methods of the various parts, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention.

[0042] Example 1

[0043] like Figures 1 to 9 As shown, a mobile assembled drop weight impact test device and installation method include a test bench, a drop weight 1 and a force sensor 5; the test bench is composed of a channel steel base 12, a guide rail 6, a support rod 9 and a steel beam 2.

[0044] like Figures 4 to 5 As shown, the channel steel base 12 is composed of four channel steels, a trapezoidal pad is provided at the bottom of the channel steel base 12, and a universal wheel clamp 13 is provided on the channel steel at a certain distance. The guide rail 6 is vertically arranged on the channel steel base 12, and a convex connecting plate 8 is provided on the guide rail 6 at a certain distance, and a rectangular groove is provided on the convex connecting plate 8.

[0045] like Figures 2 to 3 As shown, the long bolt with ring 3 is fixed in the pre-drilled screw hole of the steel beam 2, and then the steel beam 2 is placed on the top surface of the drop weight 1, and the center is found and aligned. The long bolt with ring 3 is inserted through the steel beam 2 into the cylindrical drop weight 1 and fixed by the reinforcing nut 15. The remote control unhooking device is connected with the long bolt with ring 3.

[0046] like Figure 6 As shown, one end of the support rod 9 is inserted into the rectangular groove, and the other end is inserted into the slot 11 on the steel pad 10 laid on the ground; the drop weight 1 is fixed on the steel beam 2, and the force sensor 5 is fixed on the lower surface of the drop weight 1.

[0047] like Fig.10 As shown, the force sensor 5 is a spoke-type force sensor.

[0048] like Figure 2 and Figure 3 As shown, a transverse screw hole is respectively provided at both ends of the steel beam 2, and a long bolt is provided through the screw hole. A roller 4 is provided on the long bolt, and the steel beam 2 is clamped in the groove of the guide rail 6 through the roller 4.

[0049] like Fig. 9As shown, the channel steels are reinforced by channel steel connectors 7.

[0050] like Figure 1 and Fig.11 As shown, a detachable hanging rod 16 is provided at the top end of the guide rail 6 .

[0051] like Fig.12 and Fig.13 As shown, a steel plate support 19 is installed between the guide rails 6, and the steel plate support 19 is located below the suspension rod 16.

[0052] like Fig.14 As shown, a fixing frame 18 and a displacement meter 17 are arranged on the steel plate support 19, and the displacement meter 17 is fixed on the fixing frame 18.

[0053] like Figure 8 As shown, the universal wheel fixture 13 is connected to the universal wheel module 14, and the universal wheel module 14 can adjust the angle on the vertical plane.

[0054] Example 2

[0055] A method for installing a mobile assembled drop weight impact test device, comprising using a mobile assembled drop weight impact test device as in Example 1, such as Figures 1 to 14 As shown, the installation method includes the following steps:

[0056] Step 1: Weld two steel plates to the channel steel base 12. When installing the universal wheel module 4, pass a long screw through the outer ends of the two steel plates, string them together with the universal wheel module 14, and then tighten the nut. Pass the second long screw through the inner end of the steel plate, and a rectangular support plate is welded in the middle of the screw. When the universal wheel module 14 rotates in the plumb plane, the rectangular support plate clamps the groove of the universal wheel module 14 to transfer the vertical support force of the ground. A convex connecting plate 8 is set on each of the three surfaces of the guide rail 6 at a certain height.

[0057] Step 2: vertically fix the guide rail 6 on the channel steel base 12, install the hanging rod 16 at the top of the guide rail 6, pass the bolt through the hanging rod 16 and the top of the vertical guide rail 6, string them together and tighten the nut.

[0058] Step 3: The support rod 9 is a rectangular beam, one end of which can be inserted into the rectangular groove of the connecting plate 8 and fixed with bolts. The other end of the support rod 9 is inserted into the slot 11 on the steel pad 10 and locked with bolts.

[0059] Step 4: Four channel steels 12 are connected at right angles through the channel steel connector 7. There is a trapezoidal pad at the bottom of the channel steel 12, and the four channel steels form a rectangular integral base. A universal wheel fixture 13 is set at a certain distance on each channel steel 12. The universal wheel fixture 13 and the universal wheel module 14 can be freely disassembled.

[0060] Step 5: The two ends of the steel beam 2 are respectively stuck in the grooves of the two guide rails 6 to ensure that the distance between the surface of the steel beam 2 and the surface of the guide rail 6 is 5mm. The transverse bolt 4 at the end of the steel beam 2 clamps the guide rail 6. The three surfaces of the transverse bolt 4 and the guide rail 6 fix the end of the steel beam 2 to ensure that the left and right ends of the steel beam 2 cannot deviate up and down. Apply lubricating oil evenly on the contact surface of the steel beam 2 and the guide rail 6 (groove surface, long bolt) to reduce the friction caused by relative movement. Fix the long bolt 3 with a ring in the pre-drilled screw hole of the steel beam 2, and then place the steel beam 2 on the top surface of the drop hammer, find the center and align it. Insert the long bolt 3 with a ring through the steel beam into the cylindrical drop hammer 1, tighten the reinforcement nut 15, and insert two long screws through the screw holes on both sides of the long bolt 3 with a ring into the cylindrical drop hammer 1, and tighten the nuts.

[0061] Step 6: Hook the steel cable with the remote unhooker, and pass the eyelet at the bottom of the steel cable through the ring of the long screw 3 with ring. The center of the drop weight 1, the center of the steel beam 2, and the center of the long screw 3 with ring are all on the same vertical line. There is a transverse screw hole 4 at each end of the steel beam 2. Pass the long bolt through the screw hole and tighten the nut. Then pass the four long screws through the lower surface of the spoke-type force sensor 5, insert the drop weight 1, and tighten the nut. There is a hemispherical buffer head at the bottom of the spoke-type force sensor 5.

[0062] Step 7: Insert the protruding connecting plate at the end of the steel plate support 19 into the groove of the connecting plate 8 of the vertical guide rail, insert the screw from the side of the connecting plate 8, pass through the protruding connecting plate at the end of the steel plate support 19, and tighten the nut to fix it. Arrange the displacement meter 17 and the fixing bracket 18 on the steel plate 19.

[0063] The present invention is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. A mobile assembled drop weight impact test device, characterized in that: Includes test bench, drop weight and force sensor; The test bench is composed of a channel steel base, guide rails, support rods and steel beams. The channel steel base is composed of four channel steels, a trapezoidal pad is provided at the bottom of the channel steel base, a universal wheel clamp is provided on the channel steel at a certain distance, and the universal wheel clamp is connected to the universal wheel module; two steel plates are welded to the channel steel base, a long screw passes through the outer ends of the two steel plates and is connected to the universal wheel module and a nut is tightened, a second long screw passes through the inner ends of the two steel plates and a rectangular support plate is welded in the middle of the second long screw, and when the universal wheel module rotates in the plumb plane, the rectangular support plate clamps the groove of the universal wheel module and transmits the vertical support force of the ground; The guide rail is vertically arranged on the channel steel base, and a convex connecting plate is provided on the guide rail at a certain distance, and a rectangular groove is provided on the convex connecting plate; The steel beam is clamped between the guide rails and can slide up and down along the grooves of the guide rails. The top surface of the steel beam is provided with a long screw with a ring, and the long screw with a ring is connected to a remote control unhooking device; One end of the support rod is inserted into the rectangular groove, and the other end is inserted into a slot on a steel pad laid on the ground; The drop weight is fixed on the steel beam, and the force sensor is fixed on the lower surface of the drop weight.

2. The mobile assembled drop weight impact test device according to claim 1 is characterized in that: A transverse screw hole is respectively provided at both ends of the steel beam, and a long bolt is passed through the screw hole. A roller is provided on the long bolt, and the steel beam is clamped in the groove of the guide rail through the roller.

3. The mobile assembled drop weight impact test device according to claim 1 is characterized in that: The channel steels are reinforced by channel steel connectors.

4. The mobile assembled drop weight impact test device according to claim 1 is characterized in that: A detachable hanging rod is provided at the top of the guide rail, a steel plate support is installed between the guide rails, the steel plate support is located below the hanging rod, a fixing frame and a displacement meter are arranged on the steel plate support, and the displacement meter is fixed on the fixing frame.

5. The mobile assembled drop weight impact test device according to claim 1 is characterized in that: The universal wheel module can adjust the angle on the vertical plane.

6. The mobile assembled drop weight impact test device according to claim 1 is characterized in that: The drop weight is fixed on the steel beam through a reinforcing nut, and the remote control unhooking device is suspended by a steel cable or a rope.

7. A method for installing a mobile assembled drop weight impact test device, characterized in that: The mobile assembled drop weight impact test device comprises any one of claims 1 to 6, and the installation method thereof comprises the following steps: Step 1: Assemble the universal wheel fixture on the channel steel, connect the universal wheel module to the universal wheel fixture, and install the connecting plate on the guide rail; Step 2: The guide rails are fixedly mounted on the channel steels, and the suspension rods are mounted on the top ends between the guide rails; Step 3: insert one end of the support rod into the slot on the steel backing plate, and insert the other end of the support rod into the rectangular groove; Step 4: Assemble the channel steels using the channel steel connectors to form the channel steel base; Step 5: The steel beam is installed on the guide rail, the drop weight is suspended and installed in the middle section of the steel beam, and the force sensor is installed below the drop weight; Step 6: Connect the bottom end of the steel cable or rope to the remote control unhooking device; Step seven: Install the steel plate support onto the connecting plate of the guide rail, and arrange the displacement meter on the steel plate support.

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