A lead block, a lead block manufacturing mold and a post-peak sawtooth wave impact test bench

Abstract

The lead block provided by the utility model, including the conical body, the head-removed conical body and the cylinder which are coaxially connected in sequence from top to bottom, by making the taper angle of the conical body greater than the taper angle of the head-removed conical body, the curve of data can be kept unchanged by the large taper angle area at the initial stage of the test, the plastic deformation of the lead block can be delayed by the small taper angle area at the middle part, the middle section of the rising edge is more linear, so that the concave or convex of the middle section is eliminated; the lead block manufacturing mold provided by the utility model, including a lead mold, a mold leakage located above the lead mold, a sleeve mold which is locked in the opposite position of the lead mold, by making the lower end surface of the mold leakage and the upper end surface of the sleeve mold and the lead mold keep in close contact, the lead pouring opening at the bottom of the mold leakage can be used to control the inflow speed of the lead liquid and make the lower end surface of the mold leakage level the upper surface of the lead block, the consistency of the lead block after forming is better; the post-peak sawtooth wave impact test bench provided by the utility model uses the impact cylinder to drive the impact platform to move to complete the impact test, the impact index can be improved and the application range can be expanded.

Description

Technical Field

[0001] This utility model belongs to the field of impact testing technology, specifically relating to a lead block for a back-peak sawtooth wave impact test bench, a lead block manufacturing mold, and a back-peak sawtooth wave impact test bench. Background Technology

[0002] The main purpose of impact testing is to simulate the impacts that products or equipment may encounter during transportation. The focus is on the impact effect, and the product's ability to withstand external impact environments is analyzed through the exchange of transient energy of the shock wave. Common impact tests include two main categories: half-sine wave impact test and back-peak sawtooth wave impact test. Compared with the half-sine wave impact test, the back-peak sawtooth wave impact test has the characteristic that the response amplitude of the impact on the test product with different natural frequencies is consistent with the acceleration amplitude of the excitation. This ensures that all parts of the test product can obtain the same impact response amplitude, avoiding over-impact or under-impact. It is widely used in environmental testing of test products.

[0003] Existing impact tests for sawtooth waves mostly involve the test product falling freely and impacting a conical lead block, causing the lead block to thicken and change its shape, thus generating a sawtooth waveform. However, the cone angle of these lead blocks is uniform. When the mass of the test product is relatively large, the resulting sawtooth waveform often has a depression or bulge in the middle of the rising edge, leading to distortion of the acceleration curve. The free fall method has limited impact performance and a limited range of applications. As a consumable part, multiple lead blocks are required for each impact test. These lead blocks are mostly cast directly using open molds. During casting, the flow of molten lead is uncontrolled, and there are no baffles to smooth the upper surface of the lead blocks. The consistency of the formed lead blocks is poor, which can easily cause test errors. Utility Model Content

[0004] The purpose of this invention is to overcome one or more shortcomings in the prior art and to provide a lead block for a back-peak sawtooth wave impact test bench, a lead block manufacturing mold, and a back-peak sawtooth wave impact test bench.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is a lead block used in a back-peak sawtooth wave impact test bench. The lead block includes a cone, a headless cone, and a cylinder connected coaxially from top to bottom. The bottom diameter of the cone is equal to the top diameter of the headless cone, the bottom diameter of the headless cone is equal to the outer diameter of the cylinder, and the cone angle of the cone is greater than that of the headless cone.

[0006] Preferably, the cone angle of the headless cone is greater than or equal to 120 degrees.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is a lead block manufacturing mold, comprising: A lead mold, wherein the upper end face of the lead mold is provided with a forming groove that is larger at the top and smaller at the bottom, and the inner wall of the forming groove matches the outer contour of the lead block. A mold is provided above the lead mold. A tapered groove is provided on the upper end face of the mold. The bottom of the tapered groove penetrates the mold and is aligned with the center of the forming groove to form a lead gate. A sleeve mold, which is ring-shaped and fitted onto the lead mold, has its upper end face flush with the upper end face of the lead mold. The relative positions of the sleeve mold and the lead mold are locked. The sleeve mold and the molded mold are locked together by bolts that pass through the molded mold and are threadedly connected to the sleeve mold, so that the lower end face of the molded mold is in close contact with the upper end faces of the sleeve mold and the lead mold.

[0008] Preferably, the outer surface of the lead mold is provided with an annular groove, the annular groove and the forming groove are positioned in the vertical direction, and a plurality of radial set screw holes are evenly distributed on the sleeve mold, the radial set screw holes are internally threaded with set screws, and the ends of the set screws abut against the inner wall of the annular groove, so that the relative position of the sleeve mold and the lead mold is locked.

[0009] More preferably, the cross-section of the annular groove is V-shaped.

[0010] More preferably, the lower end face of the lead mold is also provided with the forming groove, and the forming grooves on the upper end face and the lower end face of the lead mold are not connected. The outer wall of the lead mold is provided with two annular grooves, which correspond to the forming grooves on the upper end face and the lower end face of the lead mold, respectively.

[0011] More preferably, the inner wall shapes of the forming grooves opened on the upper and lower ends of the lead mold are different, so as to form lead blocks with different outer contours.

[0012] Preferably, the lead block making mold further includes an upper handle and a lower handle. The upper handle is inserted into the outer wall of the mold and extends outward along the radial direction of the mold. The lower handle is inserted into the outer wall of the die and extends along the radial direction of the die. The projections of the upper handle and the lower handle in the vertical direction coincide.

[0013] To achieve the above objectives, the technical solution adopted by this utility model is a sawtooth wave impact test bench, comprising: Base plate; A lower base plate, wherein the lower base plate is disposed above the base plate; A vibration isolation device, wherein the upper end of the vibration isolation device is connected to the lower base plate, and the lower end of the vibration isolation device is connected to the base plate, and the vibration isolation device is used to support the lower base plate and achieve vibration isolation; An upper base plate is disposed above the lower base plate; A central column, the upper end of which is connected to the upper base plate and the lower end of which is connected to the lower base plate, is used to support the upper base plate above the lower base plate. Iron platform, the iron platform is located in the middle of the upper surface of the upper base plate; An impact platform, which is vertically movable above the iron platform; The rear peak sawtooth wave impact test bench also includes an impact cylinder and a rear peak sawtooth wave generator. The impact cylinder extends vertically, with its lower end fixed to the lower base plate and its upper end fixed to the upper base plate. The cylinder rod of the impact cylinder passes through the upper base plate, and the end of the cylinder rod is connected to the impact platform to drive the impact platform to move and complete the impact test. The rear peak sawtooth wave generator is set on the iron platform and is the aforementioned lead block.

[0014] Preferably, there are multiple impact cylinders, which are symmetrically distributed on both sides of the iron platform, and multiple rear peak sawtooth wave generators, which are evenly distributed on the upper surface of the iron platform.

[0015] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The lead block provided by this utility model includes a cone, a headless cone, and a cylinder connected coaxially in sequence. By making the cone angle of the cone larger than that of the headless cone, a variable cone angle design with a large top cone angle and a small middle cone angle can be formed. In the initial stage of the test, the large cone angle area can keep the data curve unchanged. In the middle part, the small cone angle area can delay the plastic deformation of the lead block, making the middle section of the rising edge more linear, thereby eliminating the depression or bulge in the middle section. It can also increase the pulse width without changing the rising edge slope, which is particularly suitable for the back-peak sawtooth wave impact test bench. The lead block manufacturing mold provided by this utility model includes a lead mold and a cylinder located on the lead mold. The square mold and the sleeve mold locked in relative position with the lead mold, by locking the sleeve mold and the mold together, can keep the lower end face of the mold close to the upper end face of the sleeve mold and the lead mold. Thus, the flow rate of molten lead can be controlled by the lead pouring gate at the bottom of the mold, and the upper surface of the lead block can be smoothed by its lower end face. After molding, the consistency of the lead block is better and it is less likely to cause test errors. The back peak sawtooth wave impact test bench provided by this utility model abandons the free fall method and uses an impact cylinder to drive the impact platform to complete the impact test. It can improve the impact index and expand the application range. At the same time, using the above-mentioned lead block as the back peak sawtooth wave generator can also avoid the distortion of the acceleration curve. Attached Figure Description

[0016] Figure 1This is a front view schematic diagram of a preferred embodiment of the lead block in this utility model.

[0017] Figure 2 This is a top view schematic diagram of a preferred embodiment of the lead block manufacturing mold in this utility model.

[0018] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0019] Figure 4 This is a front view schematic diagram of a preferred embodiment of the sawtooth wave impact test bench of this utility model.

[0020] Figure 5 yes Figure 4 A left-side view diagram.

[0021] Among them: 10. Lead block; 11. Cone; 12. Headless cone; 13. Cylinder; 20. Lead block making mold; 21. Lead mold; 211. Forming groove; 212. Annular groove; 22. Slot mold; 221. Conical groove; 222. Lead gate; 23. Mold; 231. Radial set screw hole; 232. Set screw; 24. Bolt; 251. Upper handle; 252. Lower handle; 30. Back peak sawtooth wave impact test bench; 31. Including base plate; 32. Lower base plate; 33. Vibration isolation device; 34. Upper base plate; 35. Central column; 36. Iron platform; 37. Impact platform; 38. Impact cylinder; 39. Back peak sawtooth wave generator. Detailed Implementation

[0022] like Figure 1 As shown, the lead block 10 provided by this utility model includes a cone 11, a headless cone 12, and a cylinder 13 coaxially connected from top to bottom. The bottom diameter of the cone 11 is equal to the top diameter of the headless cone 12, and the bottom diameter of the headless cone 12 is equal to the outer diameter of the cylinder 13. The cone angle of the cone 11 is larger than that of the headless cone 12. This lead block 10 can form a variable cone angle design with a large top cone angle and a small middle cone angle. In the initial stage of the test, the large cone angle area can keep the data curve unchanged, and in the middle part, the small cone angle area can be used to delay the lead block. The plastic deformation of 10 makes the middle section of the rising edge more linear, thereby eliminating the depression or bulge in the middle section. It can also increase the pulse width without changing the slope of the rising edge, which is particularly suitable for impact testing of heavy test products on the back-peak sawtooth wave impact test bench. Preferably, the cone angle of the headless cone 12 is greater than or equal to 120 degrees. In this embodiment, the cone angle of the headless cone 12 is 124.9 degrees, the cone angle of the cone 11 is 140 degrees, the height of the headless cone 11 is 9 mm, the outer diameter of the cylinder 13 is 130 mm, and the height of the cylinder 13 is 20 mm.

[0023] like Figure 2 and Figure 3 As shown, the lead block making mold 20 provided by this utility model includes a lead mold 21, a sprue mold 22, and a sleeve mold 23. The upper end face of the lead mold 21 has a forming groove 211 that is wider at the top and narrower at the bottom. The inner wall shape of the forming groove 211 matches the outer contour of the lead block 10. The sprue mold 22 is positioned above the lead mold 21. A conical groove 221 is formed on the upper end face of the sprue mold 22. The bottom of the conical groove 221 penetrates the sprue mold 22 and aligns with the center of the forming groove 211, forming a lead pouring gate 222. The sleeve mold 23 is annular and sleeved on the lead mold 21. The upper surface of mold 23 is flush with the upper surface of lead mold 21. The relative positions of mold 23 and lead mold 21 are locked. Mold 23 and mold 22 are locked together by bolts 24 that pass through mold 22 and are threaded to mold 23. This keeps the lower surface of mold 22 in contact with the upper surface of mold 23 and lead mold 21. This allows the flow rate of molten lead to be controlled by the lead pouring port 222 at the bottom of mold 22, and the upper surface of lead block 10 to be smoothed by the lower surface of mold 22. This results in better consistency of lead block 10 after molding and reduces the likelihood of experimental errors.

[0024] In this embodiment, the outer surface of the lead mold 21 is provided with an annular groove 212. The cross-section of the annular groove 212 is V-shaped. The annular groove 212 corresponds to the molding groove 211 in the vertical direction. The sleeve mold 23 is evenly distributed with four radial set screw holes 231. The radial set screw holes 231 are internally threaded with set screws 232. The end of the set screw 232 abuts against the inner wall of the annular groove 212, so that the relative position of the sleeve mold 23 and the lead mold 21 is locked.

[0025] To improve efficiency, in this embodiment, a forming groove 211 is also provided on the lower end face of the lead mold 21, and the forming groove 211 provided on the upper end face and the lower end face of the lead mold 21 is not connected. The outer wall of the lead mold 21 is provided with two annular grooves 212, which correspond to the two forming grooves 211 provided on the upper end face and the lower end face of the lead mold 21, respectively.

[0026] Preferably, the inner wall shapes of the forming grooves 211 opened on the upper and lower ends of the lead mold 21 are different, so as to form lead blocks 10 with different outer contours.

[0027] To facilitate mold opening and closing, in this embodiment, the lead block making mold 20 further includes an upper handle 251 and a lower handle 252. The upper handle 251 is inserted into the outer wall of the mold 22 and extends outward along the radial direction of the mold 22. The lower handle 252 is inserted into the outer wall of the mold 23 and extends along the radial direction of the mold 23. The projections of the upper handle 251 and the lower handle 252 in the vertical direction coincide.

[0028] like Figure 4 and Figure 5As shown, the rear-peak sawtooth wave impact test bench 30 provided by this utility model includes a base plate 31, a lower base plate 32, a vibration isolation device 33, an upper base plate 34, a central column 35, an iron platform 36, an impact platform 37, an impact cylinder 38, and a rear-peak sawtooth wave generator 39. The base plate 31 is supported on the ground, and the plane of the base plate 31 is parallel to the horizontal plane. The lower base plate 32 is positioned above the base plate 31. The vibration isolation device 33 is positioned between the lower base plate 32 and the base plate 31, with its upper end connected to the lower base plate 32 and its lower end connected to the base plate 31. The vibration isolation device 33 supports the lower base plate 32 and provides vibration isolation. The upper base plate 34 is positioned above the lower base plate 32. The central column 35 is positioned between the upper base plate 34 and the lower base plate 32, with its upper end connected to the upper base plate 34. The upper base plate 34 is connected, and the lower end of the central column 35 is connected to the lower base plate 32. The central column 35 is used to support the upper base plate 34 above the lower base plate 32. The iron platform 36 is set in the middle of the upper surface of the upper base plate 34. The impact platform 37 is movably set above the iron platform 36. The upper surface of the impact platform 37 is used to place the test product. The impact cylinder 38 extends vertically. The lower end of the cylinder body of the impact cylinder 38 is fixed to the lower base plate 32, and the upper end of the cylinder body of the impact cylinder 38 is fixed to the upper base plate 34. The cylinder rod of the impact cylinder 38 passes through the upper base plate 34. The end of the cylinder rod is connected to the impact platform 37 to drive the impact platform 37 to move and complete the impact test. The rear peak sawtooth wave generator 39 is set on the upper surface of the iron platform 36. The rear peak sawtooth wave generator 39 is a lead block 10.

[0029] This rear peak sawtooth wave impact test bench abandons the free fall method and uses an impact cylinder to drive the impact platform to complete the impact test, which can improve the impact index and expand the scope of application. At the same time, the use of lead block 10 as the rear peak sawtooth wave generator can also avoid the distortion of the acceleration curve.

[0030] In this embodiment, there are four impact cylinders 38, which are symmetrically distributed in pairs on both sides of the iron platform 36. There are multiple rear peak sawtooth wave generators 39, which are evenly distributed on the upper surface of the iron platform 36.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A lead block for use in a back-peak sawtooth wave impact test bench, characterized in that: The lead block comprises a cone, a headless cone, and a cylinder connected coaxially from top to bottom. The diameter of the bottom surface of the cone is equal to the diameter of the top surface of the headless cone, the diameter of the bottom surface of the headless cone is equal to the outer diameter of the cylinder, and the cone angle of the cone is greater than the cone angle of the headless cone.

2. The lead block according to claim 1, characterized in that: The cone angle of the headless cone is greater than or equal to 120 degrees.

3. A mold for making lead blocks, characterized in that, include: A lead mold, wherein the upper end face of the lead mold is provided with a forming groove that is larger at the top and smaller at the bottom, and the inner wall of the forming groove matches the outer contour of the lead block as described in claim 1 or 2; A mold is provided above the lead mold. A tapered groove is provided on the upper end face of the mold. The bottom of the tapered groove penetrates the mold and is aligned with the center of the forming groove to form a lead gate. A sleeve mold, which is ring-shaped and fitted onto the lead mold, has its upper end face flush with the upper end face of the lead mold. The relative positions of the sleeve mold and the lead mold are locked. The sleeve mold and the molded mold are locked together by bolts that pass through the molded mold and are threadedly connected to the sleeve mold, so that the lower end face of the molded mold is in close contact with the upper end faces of the sleeve mold and the lead mold.

4. The lead block making mold according to claim 3, characterized in that: The outer surface of the lead mold is provided with an annular groove, which corresponds to the forming groove in the vertical direction. The sleeve mold is evenly distributed with multiple radial set screw holes, and set screws are internally threaded into the radial set screw holes. The ends of the set screws abut against the inner wall of the annular groove, thereby locking the relative position of the sleeve mold and the lead mold.

5. The lead block making mold according to claim 4, characterized in that: The cross-section of the annular groove is V-shaped.

6. The lead block making mold according to claim 4, characterized in that: The lower end face of the lead mold is also provided with the forming groove, and the forming grooves on the upper end face and the lower end face of the lead mold are not connected. The outer wall of the lead mold is provided with two annular grooves, which correspond to the forming grooves on the upper end face and the lower end face of the lead mold, respectively.

7. The lead block making mold according to claim 6, characterized in that: The inner wall shapes of the forming grooves on the upper and lower ends of the lead mold are different, so as to form lead blocks with different outer contours.

8. The lead block making mold according to claim 3, characterized in that: The lead block making mold also includes an upper handle and a lower handle. The upper handle is inserted into the outer wall of the mold and extends outward along the radial direction of the mold. The lower handle is inserted into the outer wall of the die and extends along the radial direction of the die. The projections of the upper handle and the lower handle in the vertical direction coincide.

9. A back-peak sawtooth wave impact test bench, comprising: Base plate; A lower base plate, wherein the lower base plate is disposed above the base plate; A vibration isolation device, wherein the upper end of the vibration isolation device is connected to the lower base plate, and the lower end of the vibration isolation device is connected to the base plate, and the vibration isolation device is used to support the lower base plate and achieve vibration isolation; An upper base plate is disposed above the lower base plate; A central column, the upper end of which is connected to the upper base plate and the lower end of which is connected to the lower base plate, is used to support the upper base plate above the lower base plate. Iron platform, the iron platform is located in the middle of the upper surface of the upper base plate; An impact platform, which is vertically movable above the iron platform; Its features are: The rear peak sawtooth wave impact test bench also includes an impact cylinder and a rear peak sawtooth wave generator. The impact cylinder extends vertically, with the lower end of the cylinder body fixed to the lower base plate and the upper end of the cylinder body fixed to the upper base plate. The cylinder rod of the impact cylinder passes through the upper base plate, and the end of the cylinder rod is connected to the impact platform to drive the impact platform to move and complete the impact test. The rear peak sawtooth wave generator is set on the iron platform, and the rear peak sawtooth wave generator is the lead block as described in claim 1 or 2.

10. The sawtooth wave impact test bench according to claim 9, characterized in that: There are multiple impact cylinders, which are symmetrically distributed on both sides of the iron platform. There are multiple rear peak sawtooth wave generators, which are evenly distributed on the upper surface of the iron platform.

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