Spacer ring damping type elastic pushing rod

Abstract

The utility model discloses a spacer ring damping type bullet pushing rod, and belongs to the technical field of shock waves, and the bullet pushing rod comprises an upper push rod, a middle push rod, a lower push rod and a lead screw which are sequentially connected from front to back; the front end face of the upper push rod is an abutting face used for pushing a load. The upper push rod comprises a plurality of spacer ring shock wave unloading sections which are arranged in sequence; the spacer ring shock wave unloading section is sleeved with the multiple spacer rings of an annular structure side by side, the radial positions and the axial positions of the multiple spacer rings are fixed, and the spacer rings are made of metal. The problems that in the prior art, due to the fact that the strength of the bullet pushing rod is low, the bullet pushing rod is prone to being scrapped, and the driving motor is damaged are solved. The spacer ring absorbs energy of shock waves through deformation and friction force generated by the spacer ring and the inner wall of the cavity pushed by the elastic pushing rod, so that the impact strength of the elastic pushing rod is improved, and the service life of the elastic pushing rod is prolonged.

Description

Technical Field

[0001] The present application belongs to the field of shock wave technology, and in particular relates to a spacer ring shock-absorbing ramrod. Background Art

[0002] Controllable shock wave technology is a new underwater shock wave generation method. Compared with traditional chemical explosions and electromechanical explosions, it has the advantages of high efficiency, controllable shock intensity, and controllable working times. It has good application prospects in coal seam gas control, oil field plugging, shale gas mining, and mining. The key to achieving the working times of the controllable shock wave generating device is that the pushing mechanism can stably and repeatedly push the energetic rod load. Therefore, the reliability of the push rod directly affects the stability and working efficiency of the controllable shock wave generating device.

[0003] The commutator of the pushing mechanism moves the ramrod, which pushes the load into the energy converter to generate a shock wave. The generated shock wave causes the ramrod to be damaged by a strong shock wave, and also causes damage to the drive motor. Therefore, the impact resistance of the ramrod determines the upper limit of the amplitude of the shock wave output by the controllable shock wave generating device at a time, as well as the service life of the ramrod and the drive motor. A strong shock wave will make the ramrod scrapped after working for several times and needs to be replaced. Therefore, the existing ramrod cannot meet the use requirements of the current controllable shock wave generating device. Utility Model Content

[0004] The embodiment of the present application provides a spacer ring shock-absorbing push rod, thereby solving the problem in the prior art that the push rod is easy to be scrapped and the drive motor is damaged due to the low strength of the push rod.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a spacer ring shock-absorbing push rod, including an upper push rod, a middle push rod, a lower push rod and a lead screw connected in sequence from front to back;

[0006] The front end surface of the upper push rod is an abutment surface for pushing the load;

[0007] The upper push rod includes a plurality of spacer ring shock wave unloading sections arranged in sequence; a plurality of spacer rings of annular structure are arranged side by side on the spacer ring shock wave unloading sections, the radial positions and axial positions of the plurality of spacer rings are fixed, and the spacer rings are made of metal.

[0008] In a possible implementation, the plurality of the spacer ring shock wave unloading sections include a first shock wave unloading section, a second shock wave unloading section and a third shock wave unloading section; the first shock wave unloading section and the second shock wave unloading section and the third shock wave unloading section are all threadedly connected.

[0009] In a possible implementation, the first shock wave unloading section includes a fixing column, a guide sleeve, an energy unloading rod and the spacer ring;

[0010] The center of the guide sleeve is provided with a sliding hole, a clamping hole and a threaded mounting hole from front to back, and the diameters of the sliding hole, the clamping hole and the threaded mounting hole increase in sequence;

[0011] The energy unloading rod comprises a threaded butt joint section, a sliding section and a clamping section which are arranged in sequence from front to back, and the diameters of the threaded butt joint section, the sliding section and the clamping section increase in sequence; the diameter of the clamping section is between the aperture of the sliding hole and the aperture of the clamping hole;

[0012] The threaded docking section of the energy unloading rod passes through the guide sleeve and is screwed into the threaded hole at the rear end of the fixed column. The spacer ring is sleeved on the front section of the sliding section. The front section of the sliding section is located between the fixed column and the guide sleeve. The rear section of the sliding section is located in the sliding hole. The clamping section is located in the clamping hole. The clamping section and the threaded mounting hole are spaced apart.

[0013] In a possible implementation, the guide sleeve and the fixing column are made of 42CrMo, the energy unloading rod is made of tungsten, and the spacer ring is made of titanium alloy.

[0014] In a possible implementation, a water hole is provided in the middle of the side wall of the guide sleeve at the clamping hole.

[0015] In a possible implementation, the second shock wave unloading section and the third shock wave unloading section both include a connecting column and the spacer ring;

[0016] The connecting column comprises a screw section, a sleeve section and a connecting section arranged in sequence from front to back, and the spacer ring is sleeved on the sleeve section;

[0017] The screw section of the third shock wave unloading section is screwed into the threaded hole at the rear end of the connecting section of the second shock wave unloading section, the screw section of the second shock wave unloading section is screwed into the threaded hole at the rear end of the adapter column, and the front end of the adapter column is screwed into the threaded mounting hole of the guide sleeve.

[0018] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0019] The embodiment of the utility model provides a spacer ring shock-absorbing ramrod, wherein the radial and axial positions of the plurality of spacer rings of the ramrod are fixed, that is, the spacer ring cannot move in its axial direction and cannot move in its radial direction, so that it can be deformed better to absorb the energy of the shock wave. In this embodiment, the peak stress loaded on the spacer ring reaches the GPa level. In this case, the metal can also be regarded as a compressible fluid. The spacer ring absorbs the energy of the shock wave by deforming and generating friction with the inner wall of the ramrod pushing cavity, thereby improving the impact resistance of the ramrod and the service life of the ramrod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a spacer ring shock-absorbing ramrod provided in an embodiment of the utility model.

[0022] Figure 2 A schematic structural diagram of an upper push rod provided in an embodiment of the utility model.

[0023] Figure 3 A schematic structural diagram of a middle push rod provided in an embodiment of the utility model.

[0024] Figure 4 A schematic structural diagram of an energy unloading rod provided in an embodiment of the utility model.

[0025] Figure 5 A schematic diagram of the working state of the spacer ring shock-absorbing push rod provided in an embodiment of the utility model.

[0026] Figure markings: 1-upper push rod; 2-middle push rod; 3-lower push rod; 4-screw; 5-first shock wave unloading section; 51-fixed column; 52-guide sleeve; 521-sliding hole; 522-clamping hole; 523-threaded mounting hole; 524-water hole; 53-energy unloading rod; 531-threaded docking section; 532-sliding section; 533-clamping section; 6-buffer rod shock wave unloading section; 61-push rod cylinder; 62-buffer rod; 63-energy absorbing spring; 7-coupling; 8-spacer ring; 9-connecting column; 91-screw section; 92-set section; 93-connecting section; 10-adapter column; 11-load; 12-energy converter; 121-push rod pushing cavity. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the embodiments of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0029] like Figures 1 to 5 As shown, the spacer ring shock-absorbing push rod provided by the embodiment of the utility model includes an upper push rod 1, a middle push rod 2, a lower push rod 3 and a lead screw 4 which are connected in sequence from front to back.

[0030] The front end surface of the upper push rod 1 is an abutment surface for pushing the load 11 .

[0031] The upper push rod 1 comprises a plurality of spacer ring shock wave unloading sections arranged in sequence. A plurality of spacer rings 8 of annular structure are sleeved side by side on the spacer ring shock wave unloading sections. The radial and axial positions of the plurality of spacer rings 8 are fixed, and the spacer rings 8 are made of metal.

[0032] It should be noted that the radial and axial positions of the plurality of spacer rings 8 are fixed, that is, the spacer rings 8 cannot move in the axial direction or in the radial direction, so that they can be deformed better to absorb the energy of the shock wave.

[0033] When the spacer ring shock-absorbing ramrod provided by the embodiment of the utility model is working, the load 11 of the controllable shock wave generating device generates a shock wave in the energy converter 12. When the shock wave acts on the upper push rod 1 of the ramrod, a part of the shock wave is loaded along the upper push rod 1 in the direction of the middle push rod 2, and the other part of the shock wave acts on the multiple spacer rings 8 mounted on the upper push rod 1. The stress loaded on the spacer ring 8 compresses and deforms the spacer ring 8, thereby absorbing the shock wave energy. When the spacer ring 8 is deformed, the spacer ring 8 expands in its radial direction, and the outer wall of the expanded spacer ring 8 contacts the inner wall of the ramrod pushing cavity 121 of the energy converter 12. When the spacer ring 8 moves in the direction away from the load 11 under the action of the shock wave, the outer wall of the spacer ring 8 and the inner wall of the ramrod pushing cavity 121 rub against each other to further absorb the shock wave energy.

[0034] Metal will deform when subjected to pressure, and the deformation depends on the pressure and the elastic modulus of the metal material. When the pressure is lower than the yield strength of the metal material, the deformation of the metal material is elastic deformation. In this embodiment, the peak stress applied to the spacer ring 8 reaches the GPa level. In this case, the metal can also be regarded as a compressible fluid. The spacer ring 8 absorbs the energy of the shock wave by deforming and generating friction with the inner wall of the ramrod pushing cavity 121, thereby improving the impact resistance of the ramrod and the service life of the ramrod.

[0035] In this embodiment, the plurality of spacer ring shock wave unloading sections include a first shock wave unloading section 5, a second shock wave unloading section and a third shock wave unloading section. The first shock wave unloading section 5 and the second shock wave unloading section as well as the second shock wave unloading section and the third shock wave unloading section are all threadedly connected.

[0036] It should be noted that the threaded first shock wave unloading section 5 , the second shock wave unloading section and the third shock wave unloading section can be easily installed and disassembled, and are also easy to maintain and replace.

[0037] In this embodiment, the first shock wave unloading section 5 includes a fixing column 51 , a guide sleeve 52 , an energy unloading rod 53 and a spacer ring 8 .

[0038] The center of the guide sleeve 52 is provided with a sliding hole 521, a clamping hole 522 and a threaded installation hole 523 from front to back in sequence, and the diameters of the sliding hole 521, the clamping hole 522 and the threaded installation hole 523 increase in sequence.

[0039] The energy unloading rod 53 includes a threaded butt joint section 531, a sliding section 532 and a clamping section 533 arranged from front to back, and the diameters of the threaded butt joint section 531, the sliding section 532 and the clamping section 533 increase in sequence. The diameter of the clamping section 533 is between the diameters of the sliding hole 521 and the clamping hole 522.

[0040] The threaded docking section 531 of the energy unloading rod 53 passes through the guide sleeve 52 and is screwed into the threaded hole at the rear end of the fixed column 51. The spacer ring 8 is sleeved on the front section of the sliding section 532. The front section of the sliding section 532 is located between the fixed column 51 and the guide sleeve 52. The rear section of the sliding section 532 is located in the sliding hole 521. The clamping section 533 is located in the clamping hole 522. The clamping section 533 and the threaded mounting hole 523 are arranged at intervals.

[0041] It should be noted that the front spacer ring 8 abuts against the rear end of the fixed column 51, and the rear spacer ring 8 abuts against the front end of the guide sleeve 52. The front end surface of the fixed column 51 is provided with a rounded structure in the circumference, and the motor drives the lead screw 4 to move forward and backward, thereby pushing the load 11.

[0042] When the shock wave acts on the first shock wave unloading section 5, the fixed column 51 is slidably installed due to the interval arrangement of the clamping section 533 and the threaded mounting hole 523. After the fixed column 51 absorbs the energy of the shock wave, the fixed column 51 moves backward and compresses the spacer ring 8. The fixed column 51 is the front end of the upper push rod 1, and the fixed column 51 is closest to the impact explosion zone, so the impact is the strongest, and then the displacement and reset of the fixed column 51 are achieved through the deformation of the spacer ring 8, thereby unloading the strong impact. The problem of using a spring to achieve the displacement and reset of the fixed column 51 in the prior art is avoided, and there is a problem that the spring is easily damaged and fails due to reaching the elastic limit. Therefore, the present invention uses a soft metal washer spacer ring 8 instead of a spring to ensure that the fixed column 51 can smoothly unload the shock wave and improve the reliability of the push rod.

[0043] In this embodiment, the guide sleeve 52 and the fixing column 51 are made of 42CrMo, the energy unloading rod 53 is made of tungsten, and the spacer ring 8 is made of titanium alloy.

[0044] It should be noted that when the shock wave is loaded onto the spacer ring 8, part of the shock wave will be refracted and reflected at the wave impedance mutation interface between the spacer ring 8 and the upper push rod 1, so that the amplitude of the shock wave reaching the rear of the upper push rod 1 decreases, thereby dissipating the high-amplitude shock wave into multiple low-amplitude shock waves in terms of time. This embodiment unloads the energy of the shock wave by selecting different materials.

[0045] The materials of the spacer ring 8, the energy unloading rod 53, the guide sleeve 52 and the fixed column 51 are selected to form a wave impedance discontinuity surface. The shock wave will be transmitted and reflected at the impedance discontinuity surface, so that the shock wave is decomposed into a transmitted wave and a reflected wave in time. By reflecting a part of the shock wave, the peak value of the stress wave transmitted to the rear end can be further attenuated.

[0046] In this embodiment, a water hole 524 is provided in the middle of the side wall of the guide sleeve 52 at the engaging hole 522 .

[0047] It should be noted that when the push rod is in a water environment, the water hole 524 can keep the pressure inside and outside the guide sleeve 52 balanced. When the energy unloading rod 53 moves backward, the water in the guide sleeve 52 is discharged from the water hole 524.

[0048] In this embodiment, the second shock wave unloading section and the third shock wave unloading section both include a connecting column 9 and a spacer ring 8 .

[0049] The connecting column 9 includes a screw section 91 , a sleeve section 92 and a connecting section 93 which are sequentially arranged from front to back, and the spacer ring 8 is sleeved on the sleeve section 92 .

[0050] The screw segment 91 of the third shock wave unloading segment is screwed into the threaded hole at the rear end of the connecting segment 93 of the second shock wave unloading segment, the screw segment 91 of the second shock wave unloading segment is screwed into the threaded hole at the rear end of the adapter column 10, and the front end of the adapter column 10 is screwed into the threaded mounting hole 523 of the guide sleeve 52.

[0051] It should be noted that the front end spacer ring 8 abuts against the rear end of the adapter column 10 or the rear end of the connecting section 93 , and the rear end spacer ring 8 abuts against the step surface between the sleeve section 92 and the connecting section 93 .

[0052] In this embodiment, planar cut surfaces are arranged on the outer walls of the fixed column 51, the guide sleeve 52, the push rod tube 61 and the connecting column 9. The planar cut surface is a structure formed by cutting off part of the side wall of a set plane. The staff can fix them relatively through the two planar cut surfaces to facilitate the application of force and twisting.

[0053] In this embodiment, the middle push rod 2 includes a plurality of buffer rod shock wave unloading sections 6 , and the buffer rod shock wave unloading section 6 includes a push rod tube 61 , a buffer rod 62 and an energy absorbing spring 63 .

[0054] The buffer rod 62 and the energy absorbing spring 63 are sequentially arranged in the push rod tube 61 from front to back, and the buffer rod 62 is slidably installed.

[0055] It should be noted that the push rod tubes 61 of two adjacent buffer rod shock wave unloading sections 6 are threadedly connected by a docking column. When the shock wave is loaded onto the buffer rod shock wave unloading section 6 of the middle push rod 2, a part of the shock wave is loaded onto the buffer rod 62 in the buffer rod shock wave unloading section 6, and the shock wave loaded onto the buffer rod 62 is converted into the kinetic energy of the buffer rod 62, causing the buffer rod 62 to move backward, and the backward movement of the buffer rod 62 compresses the energy absorbing spring 63 behind it, while another part of the shock wave continues to load backward. After a period of time, the energy absorbing spring 63 is reset, and the buffer rod 62 moves to the initial position. In this process, the shock wave is converted into the kinetic energy of the buffer rod 62, thereby absorbing the energy of the shock wave and directly reducing the peak value of the stress wave on the middle push rod 2 in space.

[0056] In this embodiment, the lengths of the buffer rods 62 of the plurality of buffer rod shock wave unloading sections 6 increase from front to back. The buffer rods 62 of the front buffer rod shock wave unloading section 6 are more strongly impacted, and the lengthened buffer rods 62 at the rear can increase the duration of the shock wave energy injected into the rear buffer rods 62, thereby maintaining the buffering capacity of the rear buffer rods 62 against shock waves.

[0057] It should be noted that the shock wave unloading effect of the buffer rod 62 is related to the time it takes to separate from the push rod. As the length of the buffer rod 62 increases, the time it takes for the buffer rod 62 to separate from the wall of the push rod tube 61 is prolonged, and more shock wave energy is injected into the buffer rod 62. Under the condition of multiple sections of the buffer rod 62, the front buffer rod 62 is more strongly impacted. Under the same length, the energy injected into the front buffer rod 62 is higher and the attenuation effect is better, while the energy absorption effect of the rear buffer rod 62 will gradually decay. In order to maintain the shock wave buffering ability, by extending the length of the rear buffer rod 62, the duration of energy injection into the rear buffer rod 62 can be increased, thereby increasing the shock wave buffering effect of the rear buffer rod 62.

[0058] In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiment, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A spacer ring shock-absorbing ramrod, characterized in that: It comprises an upper push rod (1), a middle push rod (2), a lower push rod (3) and a lead screw (4) which are connected in sequence from front to back; The front end surface of the upper push rod (1) is a contact surface for pushing the load (11); The upper push rod (1) comprises a plurality of spacer ring shock wave unloading sections arranged in sequence; a plurality of spacer rings (8) of annular structure are arranged side by side on the spacer ring shock wave unloading sections, the radial positions and axial positions of the plurality of spacer rings (8) are fixed, and the spacer rings (8) are made of metal.

2. The spacer ring shock-absorbing ramrod according to claim 1, characterized in that: The plurality of spacer ring shock wave unloading sections include a first shock wave unloading section (5), a second shock wave unloading section and a third shock wave unloading section; the first shock wave unloading section (5) and the second shock wave unloading section, as well as the second shock wave unloading section and the third shock wave unloading section are all threadedly connected.

3. The spacer ring shock-absorbing ramrod according to claim 2, characterized in that: The first shock wave unloading section (5) comprises a fixing column (51), a guide sleeve (52), an energy unloading rod (53) and the spacer ring (8); The center of the guide sleeve (52) is provided with a sliding hole (521), a clamping hole (522) and a threaded mounting hole (523) in sequence from front to back, and the diameters of the sliding hole (521), the clamping hole (522) and the threaded mounting hole (523) increase in sequence; The energy unloading rod (53) comprises a threaded butt joint section (531), a sliding section (532) and a clamping section (533) which are arranged in sequence from front to back, and the diameters of the threaded butt joint section (531), the sliding section (532) and the clamping section (533) increase in sequence; the diameter of the clamping section (533) is located between the diameter of the sliding hole (521) and the diameter of the clamping hole (522); The threaded docking section (531) of the energy unloading rod (53) passes through the guide sleeve (52) and is screwed into the threaded hole at the rear end of the fixed column (51); the spacer ring (8) is sleeved on the front section of the sliding section (532); the front section of the sliding section (532) is located between the fixed column (51) and the guide sleeve (52); the rear section of the sliding section (532) is located in the sliding hole (521); the clamping section (533) is located in the clamping hole (522); and the clamping section (533) and the threaded mounting hole (523) are arranged at intervals.

4. The spacer ring shock-absorbing ramrod according to claim 3, characterized in that: The guide sleeve (52) and the fixing column (51) are made of 42CrMo, the energy unloading rod (53) is made of tungsten, and the spacer ring (8) is made of titanium alloy.

5. The spacer ring shock-absorbing ramrod according to claim 3, characterized in that: The guide sleeve (52) is provided with a water hole (524) in the middle of the side wall at the clamping hole (522).

6. The spacer ring shock-absorbing ramrod according to claim 3, characterized in that: The second shock wave unloading section and the third shock wave unloading section both comprise a connecting column (9) and the spacer ring (8); The connecting column (9) comprises a screw section (91), a sleeve section (92) and a connecting section (93) which are arranged in sequence from front to back, and the spacer ring (8) is sleeved on the sleeve section (92); The screw section (91) of the third shock wave unloading section is screwed into the threaded hole at the rear end of the connecting section (93) of the second shock wave unloading section, the screw section (91) of the second shock wave unloading section is screwed into the threaded hole at the rear end of the adapter column (10), and the front end of the adapter column (10) is screwed into the threaded mounting hole (523) of the guide sleeve (52).

Images