Drop hammer impact testing machine

Abstract

The utility model provides a drop hammer impact testing machine, which comprises an experimental box body, an experimental cavity, an experimental platform, a hydraulic cylinder, a hydraulic cylinder, a hydraulic cylinder, a hydraulic cylinder and a hydraulic cylinder, the drop hammer mechanism is arranged above the experiment box body, a vacuum cavity is formed in the top of the drop hammer mechanism, the drop hammer mechanism is further provided with a drop hammer channel which is arranged in the vertical direction and communicates with the vacuum cavity and the experiment cavity, and an experiment hammer body is connected into the drop hammer channel in a sealed and sliding mode; and the vacuum control unit is connected with the vacuum cavity and is used for enabling the experimental hammer body to move upwards in the drop hammer channel after negative pressure is applied to an area above the experimental hammer body in the vacuum cavity and the drop hammer channel. The vacuum control unit is used for providing negative pressure for the area above the vacuum cavity and the experiment hammer body, so that the experiment hammer body ascends in the drop hammer channel, and compared with a traditional mechanical lifting mode, the lifting mode is more efficient and stable, the experiment hammer body can be quickly lifted, the experiment preparation time is shortened, and the experiment efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of experimental equipment technology, specifically relating to a drop hammer impact testing machine. Background Technology

[0002] The drop hammer impact test is a testing method that evaluates the impact resistance of materials or structures by applying an instantaneous impact force to a specimen using a freely falling test hammer. Based on the law of conservation of energy, a test hammer of a certain mass is lifted to a specific height to acquire corresponding gravitational potential energy, and then released to fall freely onto the specimen. During the impact, the gravitational potential energy of the test hammer is converted into kinetic energy and acts on the specimen. By observing the damage to the specimen after the impact, such as the appearance of cracks, breakage, and the degree of deformation, and by measuring relevant data during the impact process, the impact resistance of the material or structure is evaluated.

[0003] In current technology, drop hammer impact tests typically use a drop hammer impact testing machine. This machine generally employs a motor-driven device to lift a test hammer, tailored to the experimental dimensions, to a certain height. A release device then releases the hammer, allowing it to fall freely under gravity. The higher the hammer falls, the greater its velocity upon reaching the sample, and thus, the greater its kinetic energy. However, the current methods for lifting the drop hammer rely on mechanical transmission, such as chains, cables, and pulleys. These methods suffer from long lifting times and slow system response, resulting in a single test cycle exceeding 40 seconds and low testing efficiency. Utility Model Content

[0004] This application provides a drop hammer impact testing machine, which aims to solve the problem of poor practicality caused by the long single test cycle of existing drop hammer impact testing machines.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a drop hammer impact testing machine, comprising:

[0006] The experimental chamber has an experimental cavity, and an experimental platform for placing samples is provided inside the experimental cavity;

[0007] A drop hammer mechanism is disposed above the experimental chamber. The top of the drop hammer mechanism has a vacuum chamber. The drop hammer mechanism also has a drop hammer channel arranged vertically and connecting the vacuum chamber and the experimental chamber. An experimental hammer body is sealed and slidably connected inside the drop hammer channel.

[0008] A vacuum control unit, connected to the vacuum chamber, is used to apply negative pressure to the area above the experimental hammer in the vacuum chamber and the drop hammer channel, thereby causing the experimental hammer to move upward in the drop hammer channel.

[0009] In one possible implementation, the dropping hammer mechanism includes:

[0010] A vacuum chamber, wherein the inner cavity of the vacuum chamber is the vacuum cavity;

[0011] A support rod is fixed vertically to the experimental chamber, and its top end is connected to the vacuum chamber.

[0012] A vacuum tube is vertically positioned between the experimental chamber and the vacuum chamber, and the cavity of the vacuum tube serves as the drop hammer channel.

[0013] In one possible implementation, multiple vacuum tubes are provided, with the aperture of each vacuum tube increasing sequentially, and the inner cavity of each vacuum tube collectively forming the drop hammer channel;

[0014] Each of the vacuum tubes has a detachable sealing cap at its bottom end;

[0015] Each of the vacuum tubes is sealed and slidably connected to an experimental hammer.

[0016] In one possible implementation, the drop hammer impact testing machine further includes a position adjustment mechanism, the position adjustment structure comprising:

[0017] Multiple limiting blocks are provided, each of which is disposed in each of the vacuum tubes and located above each of the experimental hammers;

[0018] Multiple rotating shafts are provided, each of which is horizontally rotatable in the vacuum chamber, and each rotating shaft is correspondingly arranged with each vacuum tube; any two adjacent rotating shafts are connected by chain drive.

[0019] A drive unit, which is poweredly connected to one of the said shafts;

[0020] A traction assembly is connected to each of the rotating shafts and to each of the limiting blocks, and is used to drive each of the limiting blocks to move up and down after each of the rotating shafts rotates.

[0021] In one possible implementation, the traction component includes:

[0022] An auxiliary tube is installed vertically, and the top end of the auxiliary tube is connected to the vacuum chamber;

[0023] The gravity block is slidably disposed inside the auxiliary tube;

[0024] Multiple auxiliary sprockets are provided, and each auxiliary sprocket is configured in a one-to-one correspondence with the corresponding rotating shaft;

[0025] There are multiple chains, each chain corresponding to one of the rotating shafts. One end of each chain is connected to the top of the corresponding limiting block, and the other end passes around the corresponding auxiliary sprocket and is connected to the gravity block.

[0026] In one possible implementation, the traction assembly further includes a plurality of guide sprockets, each of which is located inside the vacuum cavity and above the auxiliary tube, and corresponds one-to-one with each of the chains, for guiding each chain into the auxiliary tube.

[0027] In one possible implementation, the experimental enclosure includes:

[0028] The box body has an inner cavity that is the experimental chamber, and an observation port communicating with the experimental chamber is provided on one side of the box body.

[0029] The movable door is slidably mounted on the side wall of the box body in a vertical direction and is located at the observation port, for opening or closing the observation port;

[0030] The telescopic structure is connected at one end to the box body and at the other end to the movable door, and is used to drive the movable door to slide in the vertical direction;

[0031] A lifting plate is horizontally disposed within the experimental chamber, and the lifting plate is slidably disposed within the experimental chamber in the vertical direction;

[0032] An experimental plate is fixed at the top of the lifting plate, and the upper surface of the experimental plate is the experimental platform.

[0033] The drive unit is connected to the housing body at one end and to the lifting plate at the other end, and is used to drive the lifting plate to slide in the vertical direction.

[0034] In one possible implementation, the movable door is provided with an observation window.

[0035] In this implementation, compared with existing technologies, by setting up an experimental chamber, a drop hammer mechanism, and a vacuum control unit, the vacuum control unit creates negative pressure in the vacuum chamber and the area above the experimental hammer, causing the experimental hammer to move upward within the drop hammer channel. Compared with traditional mechanical lifting methods, this lifting method is more efficient and stable, and can quickly complete the lifting of the experimental hammer, shortening the experimental preparation time and improving experimental efficiency. At the same time, this method of using negative pressure to lift reduces friction between mechanical parts, reduces equipment wear and the probability of failure, and improves the service life of the equipment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the front view of the drop hammer impact testing machine provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of the test chamber and drop hammer mechanism of the drop hammer impact testing machine provided in the embodiments of this application;

[0038] Figure 3 This is a schematic diagram of the internal structure of the drop hammer mechanism of the drop hammer impact testing machine provided in the embodiments of this application;

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Experimental chamber; 11. Chamber body; 12. Movable door; 121. Observation window; 13. Telescopic structure; 14. Lifting plate; 15. Experimental plate; 16. Drive unit; 20. Drop hammer mechanism; 21. Vacuum chamber; 22. Support rod; 23. Vacuum tube; 30. Position adjustment mechanism; 31. Limiting block; 32. Rotating shaft; 33. Traction assembly; 331. Auxiliary tube; 332. Gravity block; 333. Auxiliary sprocket; 334. Chain; 335. Guide sprocket; 40. Vacuum control unit. Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0042] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0043] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0045] Please refer to the following: Figures 1 to 3 The falling hammer impact testing machine provided in this application will now be described. The falling hammer impact testing machine includes a test chamber 10, a falling hammer mechanism 20, and a vacuum control unit 40. The test chamber 10 has a test cavity, within which is a test platform for placing the sample. The falling hammer mechanism 20 is positioned above the test chamber 10, and its top has a vacuum cavity. The falling hammer mechanism 20 also has a falling hammer channel arranged vertically and connecting the vacuum cavity and the test cavity, within which a test hammer is slidably and sealed. The vacuum control unit 40 is connected to the vacuum cavity and is used to create a negative pressure in the area above the test hammer in the vacuum cavity and the falling hammer channel, causing the test hammer to move upwards within the falling hammer channel.

[0046] The drop hammer impact testing machine provided in this embodiment, compared with the prior art, by setting up an experimental chamber 10, a drop hammer mechanism 20, and a vacuum control unit 40, utilizes the vacuum control unit 40 to create negative pressure in the vacuum chamber and the area above the experimental hammer, causing the experimental hammer to move upward within the drop hammer channel. Compared with traditional mechanical lifting methods, this lifting method is more efficient and stable, enabling rapid lifting of the experimental hammer, shortening experimental preparation time, and improving experimental efficiency. Simultaneously, this negative pressure lifting method reduces friction between mechanical components, lowers equipment wear and the probability of failure, and extends the equipment's service life.

[0047] In some embodiments, the aforementioned drop hammer mechanism 20 may employ, as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 The drop hammer mechanism 20 includes a vacuum chamber 21, a support rod 22, and a vacuum tube 23. The inner cavity of the vacuum chamber 21 is a vacuum chamber. The support rod 22 is fixed vertically on the experimental chamber 10, and its top end is connected to the vacuum chamber 21. The vacuum tube 23 is vertically positioned between the experimental chamber 10 and the vacuum chamber 21, and the cavity of the vacuum tube 23 serves as the drop hammer channel.

[0048] The specific structural components of the drop hammer mechanism 20 are defined. The vacuum chamber 21, as the carrier of the vacuum cavity, provides space for creating a negative pressure environment. The support rod 22 stably supports the vacuum chamber 21 above the experimental chamber 10, ensuring the overall stability of the drop hammer mechanism 20. The vacuum tube 23, as the drop hammer channel, guides the movement of the experimental hammer, enabling it to accurately fall from the vacuum cavity into the experimental chamber, thus improving the accuracy and reliability of the experiment.

[0049] Each component has a simple structure, is easy to process and install, and has a reasonable connection method, which can ensure the stability and reliability of the drop hammer mechanism 20 during operation, while also facilitating equipment maintenance and repair.

[0050] The vacuum chamber 21 can be made of stainless steel and constructed by welding or bolting to ensure its airtightness. The support rod 22 can be a cylindrical metal rod, the diameter and length of which are designed according to the overall size of the equipment and the load-bearing requirements. The vacuum tube 23 can be a seamless steel tube, the inner diameter of which is selected according to the size of the experimental hammer to ensure that the experimental hammer can slide smoothly within it.

[0051] The drop hammer mechanism 20 also includes a reinforcing plate with through holes for the support rod 22 and vacuum tube 23 to pass through. The reinforcing plate is used to reinforce the positional relationship between the support rod 22 and vacuum tube 23.

[0052] In some embodiments, the vacuum tube 23 may be as described in 1 to 1 Figure 3 The structure is shown. See 1 to 12. Figure 3 Multiple vacuum tubes 23 are provided, and the diameter of each vacuum tube 23 increases sequentially. The inner cavity of each vacuum tube 23 forms a common drop hammer channel.

[0053] Each vacuum tube 23 has a detachable sealing cap at its bottom end.

[0054] Each vacuum tube 23 is sealed and slidably connected to an experimental hammer.

[0055] Multiple vacuum tubes 23 with progressively increasing apertures form the drop hammer channel, allowing for the selection of different specifications of experimental hammers to meet various experimental needs. This expands the applicability of the equipment, enabling impact testing of various materials at different intensities. The sealing cap at the bottom of each vacuum tube 23 facilitates opening and closing when replacing the experimental hammer or maintaining the vacuum tube 23, ensuring convenient operation. Each vacuum tube 23 contains a sealed sliding connection to the experimental hammer, guaranteeing the airtightness of the hammer's movement within the drop hammer channel and preventing external air from affecting the negative pressure effect, further improving experimental accuracy.

[0056] This structural design increases the flexibility and versatility of the equipment, enabling it to meet the needs of different users in various experimental scenarios and improving its cost-effectiveness. At the same time, the sealed cover facilitates maintenance and upkeep, reducing operating costs.

[0057] Experimental hammers of different specifications can be designed according to the material's impact resistance testing standards, such as mass, shape, and size. The sealing cap can be made of rubber and installed at the bottom of the vacuum tube 23 via threaded or snap-fit ​​connections, ensuring both sealing and ease of disassembly. When installing the experimental hammer, a suitable amount of lubricant can be applied to its surface to reduce friction between it and the inner wall of the vacuum tube 23, improving the smoothness of the hammer's movement.

[0058] In some embodiments, the aforementioned drop hammer impact testing machine can be employed as follows: Figure 3 The structure shown. See also Figure 3 The drop hammer impact testing machine also includes a position adjustment mechanism 30, which comprises: limit blocks 31, rotating shafts 32, a driver, and a traction assembly 33. Multiple limit blocks 31 are provided, each positioned within a vacuum tube 23 and above each experimental hammer. Multiple rotating shafts 32 are provided, each horizontally rotatable within a vacuum chamber 21, and each shaft 32 corresponds to a vacuum tube 23. Any two adjacent shafts 32 are connected by a chain drive. The driver is poweredly connected to one of the rotating shafts 32. The traction assembly 33 is connected to each rotating shaft 32 and to each limit block 31, used to move the limit blocks 31 up and down after each rotating shaft 32 rotates.

[0059] The position adjustment mechanism 30, through the cooperation of the limit block 31, rotating shaft 32, driver, and traction component 33, can precisely adjust the position of the limit block 31, thereby controlling the initial height of the experimental hammer in the drop channel. This achieves precise control over the falling speed and impact force of the experimental hammer, improving the accuracy and repeatability of the experiment. The chain drive ensures the stability and synchronization of power transmission between the rotating shafts 32, enabling multiple limit blocks 31 to be precisely adjusted simultaneously, thus improving the operating efficiency of the equipment.

[0060] Precise control of the initial height of the experimental hammer is achieved through a simple mechanical transmission method. Compared to a complex electronic control system, this approach is lower in cost and easier to maintain. Furthermore, it can meet the impact force requirements of various experiments, further expanding the applicability of the equipment.

[0061] The limiting block 31 can be made of metal, and its shape and size are designed according to the inner diameter of the vacuum tube 23 and the size of the experimental hammer, ensuring that the limiting block 31 can slide stably within the vacuum tube 23 without affecting the movement of the experimental hammer. The driver can be a motor, connected to one of the rotating shafts 32 via a coupling. The speed and torque of the motor can be selected according to the adjustment requirements of the equipment. The chain 334 in the traction assembly 33 can be made of stainless steel to ensure its strength and wear resistance.

[0062] In some embodiments, the traction component 33 may employ, for example... Figure 3 The structure shown. See also Figure 3 The traction assembly 33 includes: an auxiliary tube 331, a gravity block 332, an auxiliary sprocket 333, and a chain 334. The auxiliary tube 331 is vertically oriented, and its top end communicates with the vacuum chamber. The gravity block 332 is slidably disposed inside the auxiliary tube 331. Multiple auxiliary sprockets 333 are provided, each corresponding to a specific rotating shaft 32. Multiple chains 334 are provided, each corresponding to a specific rotating shaft 32. One end of each chain 334 is connected to the top end of a corresponding limiting block 31, and the other end passes over the corresponding auxiliary sprocket 333 and connects to the gravity block 332.

[0063] The design of the auxiliary pipe 331, gravity block 332, auxiliary sprocket 333, and chain 334 in the traction assembly 33 utilizes the gravity of the gravity block 332 as a power source. Through the transmission of the chain 334 and auxiliary sprocket 333, the rotation of the rotating shaft 32 is converted into the lifting and lowering movement of the limit block 31. This design is simple in structure, has high transmission efficiency, and requires no additional power unit, thus reducing the energy consumption of the equipment. Simultaneously, this transmission method ensures smooth and accurate lifting and lowering movement of the limit block 31, improving the adjustment accuracy of the position adjustment mechanism 30.

[0064] The design of the traction component 33 makes full use of the principle of gravity, simplifying the structure of the equipment and reducing manufacturing costs. At the same time, the gravity of the gravity block 332 ensures that the chain 334 is always taut, avoiding the impact of chain slack on the transmission effect and improving the stability and reliability of the equipment.

[0065] The auxiliary tube 331 can be made of seamless steel pipe of the same material and specifications as the vacuum tube 23 to ensure its strength and sealing. The mass of the gravity block 332 is selected according to the weight of the limit block 31 and the adjustment requirements to ensure that it can provide sufficient power to drive the limit block 31 to rise and fall. The number of teeth and diameter of the auxiliary sprocket 333 are designed according to the specifications of the chain 334 and the rotation speed of the shaft 32 to ensure good meshing between the chain 334 and the auxiliary sprocket 333.

[0066] In some embodiments, the traction component 33 may employ, for example... Figure 3 The structure shown. See also Figure 3 The traction assembly 33 also includes multiple guide sprockets 335, each of which is located in a vacuum chamber above the auxiliary tube 331 and corresponds to each chain 334, for guiding each chain 334 into the auxiliary tube 331.

[0067] The guide sprocket 335 allows the chain 334 to enter the auxiliary tube 331 more smoothly, preventing the chain 334 from twisting or tangling during movement, thus ensuring the normal operation of the traction assembly 33 and improving the reliability and stability of the equipment. At the same time, it reduces friction between the chain 334 and the inner wall of the auxiliary tube 331, extending the service life of the chain 334 and reducing equipment maintenance costs.

[0068] The guide sprocket 335 has a simple structure and is easy to install. By guiding the chain 334, it effectively solves the problems that may occur in the chain 334 during movement, further optimizes the performance of the traction component 33, and improves the overall operating efficiency of the equipment.

[0069] The guide sprocket 335 can be made of metal, and the shape and size of its groove are designed according to the specifications of the chain 334 to ensure that the chain 334 can slide smoothly in the groove. The guide sprocket 335 can be mounted on the inner wall of the vacuum chamber 21 by bearings to ensure its rotational flexibility.

[0070] In some embodiments, the experimental chamber 10 described above can be adopted as follows: Figure 1 , Figure 2 The structure shown. See also Figure 1 , Figure 2 The experimental chamber 10 includes a chamber body 11, a movable door 12, a telescopic structure 13, a lifting plate 14, an experimental plate 15, and a drive unit 16. The inner cavity of the chamber body 11 is the experimental chamber, and an observation port communicating with the experimental chamber is provided on one side of the chamber body 11. The movable door 12 is slidably mounted vertically on the side wall of the chamber body 11 and located at the observation port, used to open or close the observation port. One end of the telescopic structure 13 is connected to the chamber body 11, and the other end is connected to the movable door 12, used to drive the movable door 12 to slide vertically. The lifting plate 14 is horizontally mounted inside the experimental chamber and slides vertically within the experimental chamber. The experimental plate 15 is fixed to the top of the lifting plate 14, and its upper surface is the experimental platform. One end of the drive unit 16 is connected to the chamber body 11, and the other end is connected to the lifting plate 14, used to drive the lifting plate 14 to slide vertically.

[0071] The structural design of the experimental chamber 10 makes experimental observation and sample height adjustment more convenient. The observation port and movable door 12 on the chamber body 11 allow operators to observe the experimental process and promptly understand the impact of the sample. The telescopic structure 13 can drive the movable door 12 to open and close quickly, improving the efficiency of experimental operations. The lifting plate 14 and experimental plate 15 can slide vertically under the action of the driving unit 16, facilitating the adjustment of the sample's experimental height to meet the impact height requirements of different experiments, further improving the accuracy and flexibility of the experiment.

[0072] The structural design of the experimental chamber 10 fully considers the actual needs of experimental operations, organically combining observation and adjustment functions, enabling operators to perform experiments more conveniently and quickly, thus improving experimental efficiency and quality. At the same time, the reasonable connection and transmission methods between components ensure the stability and reliability of the experimental chamber 10 during operation.

[0073] The telescopic structure 13 can be a cylinder or an electric actuator, connected to the control system via pipes or wires to automatically open and close the movable door 12. The drive unit 16 can be a motor and a lead screw and nut mechanism. The motor drives the lead screw to rotate, and the lead screw and nut mechanism converts the rotation of the lead screw into the linear motion of the lifting plate 14, achieving precise adjustment of the sample height. The size of the observation port is designed according to experimental requirements and the operator's field of vision to ensure clear observation of the experimental process.

[0074] In some embodiments, the aforementioned active door 12 may employ, as follows: Figure 1 , Figure 2 The structure shown. See also Figure 1 , Figure 2 An observation window 121 is provided on the movable door 12.

[0075] An observation window 121 is installed on the movable door 12, which further improves the clarity and convenience of experimental observation. Operators can directly observe the experimental process without opening the movable door 12, avoiding interference from external factors and ensuring the accuracy and stability of the experiment. At the same time, the observation window 121 also increases the safety of the equipment, preventing operators from being injured by fragments generated by the impact of the experimental hammer while observing the experiment.

[0076] The setting of observation window 121 is a further optimization of the observation function of experimental chamber 10. It has a simple structure and low cost, but can significantly improve the convenience and safety of experimental operation and enhance the overall performance of the equipment.

[0077] The observation window 121 can be made of high-strength transparent glass or plexiglass, and its size and shape are designed according to the size of the sliding door 12 and the observation requirements. The observation window 121 can be fixed to the sliding door 12 by sealing strips or frames to ensure its airtightness and installation firmness.

[0078] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drop hammer impact testing machine, characterized in that, include: The experimental chamber has an experimental cavity, and an experimental platform for placing samples is provided inside the experimental cavity; A drop hammer mechanism is disposed above the experimental chamber. The top of the drop hammer mechanism has a vacuum chamber. The drop hammer mechanism also has a drop hammer channel arranged vertically and connecting the vacuum chamber and the experimental chamber. An experimental hammer body is sealed and slidably connected inside the drop hammer channel. A vacuum control unit, connected to the vacuum chamber, is used to create negative pressure in the vacuum chamber and the area above the experimental hammer in the drop hammer channel to cause the experimental hammer to move upward in the drop hammer channel.

2. The drop hammer impact testing machine as described in claim 1, characterized in that, The falling hammer mechanism includes: A vacuum chamber, wherein the inner cavity of the vacuum chamber is the vacuum cavity; A support rod is fixed vertically to the experimental chamber, and its top end is connected to the vacuum chamber. A vacuum tube is vertically positioned between the experimental chamber and the vacuum chamber, and the cavity of the vacuum tube serves as the drop hammer channel.

3. The drop hammer impact testing machine as described in claim 2, characterized in that, The vacuum tubes are provided in multiple ways, and the diameter of each vacuum tube increases sequentially. The inner cavity of each vacuum tube is used to form the drop hammer channel. Each of the vacuum tubes has a detachable sealing cap at its bottom end; Each of the vacuum tubes is sealed and slidably connected to an experimental hammer.

4. The drop hammer impact testing machine as described in claim 3, characterized in that, The drop hammer impact testing machine further includes a position adjustment mechanism, the position adjustment mechanism comprising: Multiple limiting blocks are provided, each of which is disposed in each of the vacuum tubes and located above each of the experimental hammers; Multiple rotating shafts are provided, each of which is horizontally rotatable in the vacuum chamber, and each rotating shaft is correspondingly arranged with each vacuum tube; any two adjacent rotating shafts are connected by chain drive. A drive unit, which is poweredly connected to one of the said shafts; A traction assembly is connected to each of the rotating shafts and to each of the limiting blocks, and is used to drive each of the limiting blocks to move up and down after each of the rotating shafts rotates.

5. The drop hammer impact testing machine as described in claim 4, characterized in that, The traction assembly includes: An auxiliary tube is installed vertically, and the top end of the auxiliary tube is connected to the vacuum chamber; The gravity block is slidably disposed inside the auxiliary tube; Multiple auxiliary sprockets are provided, and each auxiliary sprocket is configured in a one-to-one correspondence with the corresponding rotating shaft; There are multiple chains, each chain corresponding to one of the rotating shafts. One end of each chain is connected to the top of the corresponding limiting block, and the other end passes around the corresponding auxiliary sprocket and is connected to the gravity block.

6. The drop hammer impact testing machine as described in claim 5, characterized in that, The traction assembly also includes multiple guide sprockets, each of which is located inside the vacuum cavity and above the auxiliary tube, and corresponds one-to-one with each of the chains, for guiding each chain into the auxiliary tube.

7. The drop hammer impact testing machine as described in claim 1, characterized in that, The experimental chamber includes: The box body has an inner cavity that is the experimental chamber, and an observation port communicating with the experimental chamber is provided on one side of the box body. The movable door is slidably mounted on the side wall of the box body in a vertical direction and is located at the observation port, for opening or closing the observation port; The telescopic structure is connected at one end to the box body and at the other end to the movable door, and is used to drive the movable door to slide in the vertical direction; A lifting plate is horizontally disposed within the experimental chamber, and the lifting plate is slidably disposed within the experimental chamber in the vertical direction; An experimental plate is fixed at the top of the lifting plate, and the upper surface of the experimental plate is the experimental platform. The drive unit is connected to the housing body at one end and to the lifting plate at the other end, and is used to drive the lifting plate to slide in the vertical direction.

8. The drop hammer impact testing machine as described in claim 7, characterized in that, The movable door is equipped with an observation window.

Images