Spring-adjustable electric impact rammer and its working method

Abstract

The application belongs to the technical field of devices for improving soil by ramming or vibrating, and particularly relates to a spring-adjustable electric impact rammer and a working method thereof, wherein the spring-adjustable electric impact rammer comprises a driving part connected with an impact part, and the driving part drives the impact part to impact; the impact part comprises a first guide cylinder and an inner cylinder sleeve slidingly arranged in the first guide cylinder; a piston rod is arranged in the inner cylinder sleeve and connected with the driving part; the driving part drives the piston rod to move, the moving sleeve is driven by an impact spring to move, the size of the accommodating cavity is adjusted, the size of the accommodating cavity is in a maximum state after the piston rod stops for a period of time, and the moving sleeve is hindered from moving upward by lubricating oil in a pressure cavity when the piston rod moves, so that the size of the accommodating cavity is smaller than the maximum state, and then the impact spring is kept in a balanced state after the impact rammer stops, and the rigidity and elasticity of the impact spring are prevented from being reduced due to long-term compression.

Description

Technical Field

[0001] The invention belongs to the technical field of devices for improving soil by compaction or vibration, and in particular relates to a spring-adjustable electric impact rammer and a working method thereof. Background Art

[0002] An rammer is a compacting machine that uses impact and vibration to compact backfill soil in layers. The impact spring is compressed when the piston rod moves upward, and when the piston rod moves downward, the impact spring recovers its deformation and releases the stored elastic potential energy to enhance the impact force of the rammer on the ground. However, this method causes the impact spring to always remain in a compressed state when the piston rod is at a high point. If the rammer is deactivated, the impact spring will remain in a compressed state for a long time, which will cause its rigidity and elastic properties to decrease, resulting in a reduction in the service life of the impact spring.

[0003] Therefore, due to the technical problem that the impact spring remains in a compressed state for a long time after the rammer is deactivated, and eventually its rigidity and elasticity performance decrease, it is necessary to design a spring-adjustable electric rammer and a working method thereof.

[0004] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0005] The embodiments of the present disclosure at least provide a spring-adjustable electric rammer and a working method thereof.

[0006] In a first aspect, an embodiment of the present disclosure provides a spring-adjustable electric rammer, comprising:

[0007] Driving part and impact part;

[0008] The driving part is connected to the impact part, and the driving part drives the impact part to impact; wherein

[0009] The impact part includes: a first guide cylinder, and an inner cylinder sleeve slidably arranged in the first guide cylinder;

[0010] A piston rod is passed through the inner cylinder sleeve, and the piston rod is connected to the driving part;

[0011] The piston rod is sleeved with a movable sleeve, and the movable sleeve is provided with a ring body whose outer wall contacts the inner wall of the inner cylinder sleeve;

[0012] The piston rod is provided with a block whose outer wall contacts the inner wall of the inner cylinder sleeve, and the block is located below the movable sleeve;

[0013] A receiving cavity is formed between the block and the ring body, and a pressure cavity is formed between the ring body and the inner top surface of the inner cylinder sleeve;

[0014] An impact spring is connected between the block and the ring;

[0015] The driving part drives the piston rod to move, and drives the movable sleeve to move through the impact spring to adjust the size of the accommodating chamber. After the piston rod stops for a period of time, the size of the accommodating chamber is at its maximum state, and when the piston rod moves, the lubricating oil in the pressure chamber hinders the movable sleeve from moving upward, so that the size of the accommodating chamber is smaller than the maximum state.

[0016] In an optional embodiment, after the electric rammer stops for a period of time, the ring body contacts the inner top surface of the inner cylinder sleeve, and the accommodating cavity is in a maximum state. At this time, the piston rod moves upward to the highest position, and the impact spring is in a balanced state;

[0017] After the electric rammer is started, when the piston rod moves downward to the lowest position for the first time, the impact spring drives the movable sleeve downward, causing the accommodating chamber to decrease and the pressure chamber to increase. At this time, lubricating oil is introduced into the pressure chamber to fill the pressure chamber.

[0018] When the pressure chamber is filled with lubricating oil, when the piston rod moves upward to the highest position, the impact spring is in a compressed state. At this time, the lubricating oil in the pressure chamber prevents the movable sleeve from moving upward.

[0019] In an optional embodiment, the top surface of the inner cylinder sleeve is in a sealed state, and a through hole is formed thereon, and the piston rod is arranged through the through hole;

[0020] The top surface of the inner cylinder sleeve is provided with a plurality of oil inlet holes connected to the pressure chamber, and a one-way valve is provided in each of the oil inlet holes;

[0021] The top of the piston rod is connected to a slider, the side wall of the slider contacts the inner wall of the first guide cylinder, an oil chamber is formed between the slider and the top surface of the inner cylinder sleeve, and the lubricating oil in the oil chamber enters the pressure chamber through the oil inlet hole.

[0022] In an optional embodiment, an oil leakage hole is opened on the movable sleeve to connect the pressure chamber and the accommodating chamber through the oil leakage hole;

[0023] The oil leakage hole is smaller than the oil inlet hole;

[0024] When the piston rod moves to the highest position and stops moving, the lubricating oil in the pressure chamber is discharged through the oil leakage hole, so that the movable sleeve moves upward until the ring body contacts the inner top surface of the inner cylinder sleeve.

[0025] In an optional embodiment, the bottom surface of the inner cylinder liner is connected to an impact plate;

[0026] The bottom surface of the inner cylinder sleeve is open;

[0027] A damping spring is connected between the block and the impact plate;

[0028] When the piston rod moves downward, it drives the impact plate to impact through the inner cylinder sleeve.

[0029] In an optional embodiment, a second guide cylinder is further sleeved on the outer surface of the inner cylinder sleeve;

[0030] The second guide cylinder is connected to the inner cylinder sleeve, and a bellows is connected between the second guide cylinder and the first guide cylinder.

[0031] In an optional embodiment, the driving unit includes: a driving motor and a transmission mechanism;

[0032] The driving motor is arranged on the housing, and the first guide cylinder is connected to the housing;

[0033] The transmission mechanism is arranged in the housing, and the transmission mechanism is connected to the driving motor and the slider;

[0034] The driving motor drives the slider to move through the transmission mechanism, thereby driving the piston rod to move.

[0035] In an optional embodiment, the transmission mechanism includes: a first helical gear and a second helical gear;

[0036] The first helical gear is connected to the output shaft of the drive motor via a clutch;

[0037] The second helical gear is rotatably disposed in the housing, and the second helical gear is meshed with the first helical gear;

[0038] A column is eccentrically provided on one surface of the second helical gear in the thickness direction, and the column is parallel to the axis of the second helical gear;

[0039] The column is connected to a connecting rod via a bearing, and the connecting rod is rotatably connected to the slider;

[0040] The driving motor drives the first helical gear to rotate, thereby driving the second helical gear to rotate, and further drives the piston rod to move up and down repeatedly through the connecting rod.

[0041] In an optional embodiment, a grip portion is rotatably provided on the top of the shell, and a battery box for powering the drive motor is provided in the grip portion.

[0042] In a second aspect, the present disclosure further provides a method for operating the spring-adjustable electric rammer, comprising:

[0043] The driving portion drives the piston rod to move, and drives the movable sleeve to move via the impact spring to adjust the size of the accommodating chamber. After the piston rod stops for a period of time, the size of the accommodating chamber is at its maximum state. When the piston rod moves, the lubricating oil in the pressure chamber hinders the movable sleeve from moving upward, so that the size of the accommodating chamber is smaller than the maximum state.

[0044] When the piston rod moves downward, it drives the impact plate to impact through the inner cylinder sleeve.

[0045] The beneficial effects of the present invention are as follows: the spring-adjustable electric impact rammer comprises: a driving part and an impact part; the driving part is connected to the impact part, and the driving part drives the impact part to impact; the impact part comprises: a first guide cylinder, and an inner cylinder sleeve slidably arranged in the first guide cylinder; a piston rod is passed through the inner cylinder sleeve, and the piston rod is connected to the driving part; a movable sleeve is sleeved on the piston rod, and a ring body is provided on the movable sleeve, the outer wall of which contacts the inner wall of the inner cylinder sleeve; a block is provided on the piston rod, and the outer wall contacts the inner wall of the inner cylinder sleeve, and the block is located below the movable sleeve; the block and the ring An accommodating chamber is formed between the blocks, and a pressure chamber is formed between the ring body and the inner top surface of the inner cylinder sleeve; an impact spring is connected between the block and the ring body; the driving part drives the piston rod to move, and drives the movable sleeve to move through the impact spring to adjust the size of the accommodating chamber. After the piston rod stops for a period of time, the size of the accommodating chamber is in a maximum state, and when the piston rod moves, the lubricating oil in the pressure chamber hinders the movable sleeve from moving upward, so that the size of the accommodating chamber is smaller than the maximum state, thereby achieving the goal of keeping the impact spring in a balanced state after the rammer stops, and avoiding the impact spring from being kept in a compressed state for a long time, which will cause its rigidity and elastic performance to decrease.

[0046] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1A schematic structural diagram of a spring-adjustable electric rammer provided in an embodiment of the present disclosure;

[0050] Figure 2 A cross-sectional view of a spring-adjustable electric rammer provided in an embodiment of the present disclosure;

[0051] Figure 3 A schematic structural diagram of an inner cylinder liner provided in an embodiment of the present disclosure;

[0052] Figure 4 A schematic structural diagram of a movable sleeve provided in an embodiment of the present disclosure;

[0053] Figure 5 A schematic diagram of the position of a movable sleeve of a spring-adjustable electric rammer during operation provided by an embodiment of the present disclosure;

[0054] Figure 6 A schematic diagram of the position of a movable sleeve of a spring-adjustable electric rammer when it is stopped, provided by an embodiment of the present disclosure;

[0055] Figure 7 A schematic structural diagram of the transmission mechanism provided in an embodiment of the present disclosure.

[0056] In the picture:

[0057] 1 driving unit, 11 driving motor, 12 housing, 13 transmission mechanism, 131 first helical gear, 132 second helical gear, 133 cylinder, 134 bearing, 135 connecting rod, 14 clutch;

[0058] 2 Impact part, 21 first guide cylinder, 22 inner cylinder sleeve, 221 through hole, 222 oil inlet hole, 23 movable sleeve, 231 ring body, 232 oil leakage hole, 24 piston rod, 241 block body, 242 slider, 243 impact spring, 25 accommodating chamber, 26 pressure chamber, 27 oil chamber, 28 impact plate, 281 damping spring, 29 second guide cylinder, 291 bellows;

[0059] 3. Grip portion, 31. Battery box. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0061] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0062] A rammer is a compaction machine that uses impact and vibration to compact backfill soil layer by layer. It can be divided into electric rammers, gasoline rammers, and vibratory rammers. Electric rammers use an electric motor, driven by a reducer and crank-connecting rod mechanism, to drive a rammer plate in a rapid impact motion to compact the soil. The crank-connecting rod is connected to the rammer plate by a piston rod, and an impact spring is positioned between the piston and inner sleeve. After the motor is started, the motor's rotational motion acts on the piston rod through an eccentric connecting rod, converting the motor's rotational motion into linear reciprocating motion of the piston. This motion is then transmitted to the inner cylinder and rammer plate by the impact spring, thus achieving the rammer's tamping action. The impact spring is compressed as the piston rod moves upward. When the piston rod moves downward, the impact spring recovers its deformation and releases stored elastic potential energy, enhancing the rammer's impact force on the ground. However, this method results in the impact spring remaining compressed when the piston rod is at its highest point. If the rammer is deactivated, the spring's long-term compression can lead to a decrease in its rigidity and elasticity, shortening its service life. The driving source of the rammer is a DC motor. The output shaft of the DC motor is connected to the transmission gear. The transmission gear is provided with a connecting piece for connecting the crank connecting rod. When the motor rotates, it drives the transmission gear to rotate and then drives the crank connecting rod to move back and forth, and then drives the piston rod to move up and down to realize the up and down movement of the rammer plate. The inventor found that since an impact spring and a vibration-damping spring are provided in the rammer, and the rigidity of the vibration-damping spring is greater than the rigidity of the impact spring, when the rammer stops, the vibration-damping spring will slowly recover, and then push the piston rod to the starting point. However, at this time, the impact spring will be compressed for a long time because the piston rod is at the starting position, which will affect its rigidity and elasticity.

[0063] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article should be the contributions made by the inventors to the present disclosure during the disclosure process.

[0064] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0065] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0066] like Figure 1 and Figure 2 As shown, at least one disclosed embodiment provides a spring-adjustable electric rammer, comprising: a driving part 1 and an impact part 2; the driving part 1 is connected to the impact part 2, and the driving part 1 drives the impact part 2 to impact; the impact part 2 comprises: a first guide cylinder 21, and an inner cylinder sleeve 22 slidably arranged in the first guide cylinder 21; a piston rod 24 is passed through the inner cylinder sleeve 22, and the piston rod 24 is connected to the driving part 1; a movable sleeve 23 is sleeved on the piston rod 24, and a ring body 231 is provided on the movable sleeve 23, the outer wall of which contacts the inner wall of the inner cylinder sleeve 22; a block 241 is provided on the piston rod 24, and the outer wall contacts the inner wall of the inner cylinder sleeve 22, and the block 241 is located below the movable sleeve 23; the block 241 An accommodating chamber 25 is formed between the block 241 and the ring body 231, and a pressure chamber 26 is formed between the ring body 231 and the inner top surface of the inner cylinder sleeve 22; an impact spring 243 is connected between the block 241 and the ring body 231; the driving part 1 drives the piston rod 24 to move, and drives the movable sleeve 23 to move through the impact spring 243 to adjust the size of the accommodating chamber 25. After the piston rod 24 stops for a period of time, the size of the accommodating chamber 25 is in the maximum state, and when the piston rod 24 moves, the lubricating oil in the pressure chamber 26 hinders the movable sleeve 23 from moving upward, so that the size of the accommodating chamber 25 is smaller than the maximum state, thereby achieving the goal of keeping the impact spring 243 in a balanced state after the rammer is stopped, and avoiding the impact spring 243 remaining in a compressed state for a long time, which will cause its rigidity and elastic performance to decrease.

[0067] In this embodiment, the rigidity of the damping spring 281 is greater than the rigidity of the impact spring 243. When the rammer stops, the damping spring 281 will slowly recover its deformation, thereby pushing the piston rod 24 to the starting point. After the piston rod 24 stops for a period of time, the size of the accommodating chamber 25 is at its maximum state.

[0068] In this embodiment, after the piston rod 24 stops for a period of time, that is, the electric rammer is shut down for a period of time, during this period of time, the lubricating oil in the pressure chamber 26 is gradually squeezed out of the pressure chamber 26 from the oil leakage hole 232, the ring body 231 gradually moves upward to contact the top surface of the inner cylinder sleeve 22, the accommodating chamber 25 gradually expands to its maximum state, and the impact spring 243 gradually returns to a balanced state from the compressed state just after the shutdown.

[0069] In this embodiment, the piston rod 24 of the electric rammer moves to the highest position after being stopped for a period of time. At this time, the accommodating chamber 25 is in the maximum state, the impact spring 243 located in the accommodating chamber 25 is in a balanced state, and the shock-absorbing spring 281 is also in a balanced state. The balanced state is that the spring is neither in a compressed state nor in a stretched state. At this time, when the electric rammer is placed for a long time, avoiding the impact spring 243 from being kept in a compressed state for a long time will cause its rigidity and elastic performance to decrease.

[0070] In this embodiment, when the electric rammer is working, the size of the accommodating chamber 25 will be smaller than the maximum state. At this time, when the piston rod 24 moves up and down repeatedly, the impact spring 243 is compressed when the piston rod 24 moves upward, and when the piston rod 24 moves downward, the impact spring 243 recovers its deformation and releases the stored elastic potential energy to enhance the impact force of the rammer on the ground.

[0071] In an optional embodiment, as Figure 6 As shown, after the electric rammer has been stopped for a period of time, the ring body 231 contacts the inner top surface of the inner cylinder sleeve 22, and the accommodating chamber 25 is in the largest state. At this time, the piston rod 24 moves upward to the highest position, and the impact spring 243 is in a balanced state. After the electric rammer is started, when the piston rod 24 moves downward to the lowest position for the first time, the impact spring 243 drives the movable sleeve 23 to move downward, so that the accommodating chamber 25 decreases and the pressure chamber 26 increases. At this time, lubricating oil is introduced into the pressure chamber 26 to fill the pressure chamber 26. Figure 5 As shown, when the pressure chamber 26 is filled with lubricating oil, when the piston rod 24 moves upward to the highest position, the impact spring 243 is in a compressed state. At this time, the lubricating oil in the pressure chamber 26 prevents the movable sleeve 23 from moving upward.

[0072] In this embodiment, when the electric rammer is stopped for a period of time, the piston rod 24 is in the highest position. At this time, the ring body 231 contacts the top surface of the inner cylinder sleeve 22, and the accommodating cavity 25 is in the largest state, so that the impact spring 243 is in a balanced state. When the electric rammer is placed for a long time, it is necessary to avoid keeping the impact spring 243 in a compressed state for a long time, otherwise its rigidity and elastic performance will decrease.

[0073] In this embodiment, when the electric rammer is started, when the piston rod 24 moves downward to the lowest position for the first time, the movable sleeve 23 is driven downward by the impact spring 243, so that the accommodating chamber 25 decreases and the pressure chamber 26 increases. At this time, lubricating oil is introduced into the pressure chamber 26 to fill the pressure chamber 26. Since the accommodating chamber 25 is reduced, during the repeated up and down movements of the piston rod 24, the impact spring 243 can be compressed when the piston rod 24 moves upward. When the piston rod 24 moves up and down repeatedly, the movable sleeve 23 cannot move upward quickly because the pressure chamber 26 is filled with lubricating oil, and the size of the accommodating chamber 25 is kept smaller than the maximum state, ensuring that the impact spring 243 can be compressed.

[0074] In this embodiment, during the operation of the electric rammer, since the piston rod 24 moves up and down at a relatively fast speed and since a one-way valve is provided in the oil inlet hole 222, the lubricating oil in the pressure chamber 26 cannot flow into the oil chamber 27. The lubricating oil in the pressure chamber 26 that is reduced due to leakage from the oil leakage hole 232 can be replenished through the oil chamber 27.

[0075] In this embodiment, the outer wall of the ring body 231 contacts the inner wall of the inner cylinder sleeve 22, so that the pressure chamber 26 and the accommodating chamber 25 can be separated, preventing the lubricating oil in the pressure chamber 26 from flowing down from between the ring body 231 and the inner wall of the inner cylinder sleeve 22, and ensuring that the lubricating oil in the pressure chamber 26 does not hinder the movable sleeve 23.

[0076] In this embodiment, a hole may be provided on the block 241 so that the lubricating oil leaking into the accommodating cavity 25 can be discharged through the hole.

[0077] like Figure 3 As shown, in an optional embodiment, the top surface of the inner cylinder sleeve 22 is in a sealed state, and a through hole 221 is provided on it, and the piston rod 24 is arranged through the through hole 221; the top surface of the inner cylinder sleeve 22 is provided with a plurality of oil inlet holes 222 connected to the pressure chamber 26, and a one-way valve is provided in the oil inlet hole 222; the top of the piston rod 24 is connected to a slider 242, and the side wall of the slider 242 is in contact with the inner wall of the first guide cylinder 21, and an oil chamber 27 is formed between the slider 242 and the top surface of the inner cylinder sleeve 22, and the lubricating oil in the oil chamber 27 enters the pressure chamber 26 through the oil inlet hole 222.

[0078] like Figure 4 As shown, in an optional embodiment, an oil leakage hole 232 is provided on the movable sleeve 23 to connect the pressure chamber 26 and the accommodating chamber 25 through the oil leakage hole 232; the oil leakage hole 232 is smaller than the oil inlet hole 222; when the piston rod 24 moves to the highest position and stops moving, the lubricating oil in the pressure chamber 26 is discharged through the oil leakage hole 232, so that the movable sleeve 23 moves upward until the ring body 231 contacts the inner top surface of the inner cylinder sleeve 22.

[0079] In this embodiment, the lubricating oil enters the accommodating chamber 25 through the oil leakage hole 232 to lubricate the piston rod 24 .

[0080] In this embodiment, when the electric rammer is stopped for a period of time, the top surface of the ring body 231 contacts the inner top surface of the inner cylinder sleeve 22, so that the oil inlet hole 222 is blocked by the ring body 231, so as to prevent the lubricating oil in the oil chamber 27 from entering the pressure chamber 26 when the electric rammer is stopped, thereby preventing the lubricating oil in the oil chamber 27 from leaking out.

[0081] In this embodiment, when the electric rammer is just stopped, the piston rod 24 is in the highest position. At this time, due to the presence of lubricating oil in the pressure chamber 26, the accommodating chamber 25 is not yet in the maximum state, so that the impact spring 243 is in a compressed state. The impact spring 243 pushes the movable sleeve 23 upward, and the lubricating oil in the pressure chamber 26 is gradually squeezed out of the pressure chamber 26 from the oil leakage hole 232. The space where the lubricating oil flows out is filled by the upward movement of the movable sleeve 23, so that the ring body 231 gradually moves upward until it contacts the top surface of the inner cylinder sleeve 22, and the accommodating chamber 25 gradually expands to the maximum state. The impact spring 243 recovers the equilibrium state from the compressed state, and the compressed impact spring 243 pushes the movable sleeve 23 upward to squeeze the lubricating oil in the pressure chamber 26 and accelerate the lubricating oil to flow out of the oil leakage hole 232.

[0082] like Figure 2 As shown, in an optional embodiment, the bottom surface of the inner cylinder liner 22 is connected to the impact plate 28; the bottom surface of the inner cylinder liner 22 is open; a shock-absorbing spring 281 is connected between the block 241 and the impact plate 28; when the piston rod 24 moves downward, the impact plate 28 is driven by the inner cylinder liner 22 to impact.

[0083] In this embodiment, the piston rod 24 repeatedly drives the inner cylinder sleeve 22 to move up and down, thereby driving the impact plate 28 to repeatedly move up and down to impact.

[0084] like Figure 2 As shown, in an optional embodiment, a second guide cylinder 29 is further provided on the outside of the inner cylinder sleeve 22; the second guide cylinder 29 is connected to the inner cylinder sleeve 22, and a bellows 291 is connected between the second guide cylinder 29 and the first guide cylinder 21.

[0085] In this embodiment, the bellows 291 can expand and contract as the impact plate 28 repeatedly moves up and down, and the bellows 291 can cover the inner cylinder sleeve 22 to play a dust-proof role.

[0086] In an optional embodiment, the driving unit 1 includes: a driving motor 11 and a transmission mechanism 13; the driving motor 11 is arranged on the housing 12, and the first guide cylinder 21 is connected to the housing 12; the transmission mechanism 13 is arranged in the housing 12, and the transmission mechanism 13 is connected to the driving motor 11 and the slider 242; the driving motor 11 drives the slider 242 to move through the transmission mechanism 13, so as to drive the piston rod 24 to move.

[0087] In this embodiment, the driving motor 11 may be a DC motor.

[0088] like Figure 7 As shown, in an optional embodiment, the transmission mechanism 13 includes: a first bevel gear 131 and a second bevel gear 132; the first bevel gear 131 is connected to the output shaft of the drive motor 11 through a clutch 14; the second bevel gear 132 is rotatably arranged in the housing 12, and the second bevel gear 132 is engaged with the first bevel gear 131; a cylinder 133 is eccentrically arranged on one surface in the thickness direction of the second bevel gear 132, and the cylinder 133 is parallel to the axis of the second bevel gear 132; a connecting rod 135 is connected to the cylinder 133 through a bearing 134, and the connecting rod 135 is rotatably connected to the slider 242; the drive motor 11 drives the first bevel gear 131 to rotate, so as to drive the second bevel gear 132 to rotate, and then drives the piston rod 24 to move up and down repeatedly through the connecting rod 135.

[0089] In an optional embodiment, a grip portion 3 is rotatably provided on the top of the housing 12 , and a battery box 31 for supplying power to the drive motor 11 is provided in the grip portion 3 .

[0090] In this embodiment, the driving motor 11 may be electrically connected to the control module to control the starting of the driving motor 11 .

[0091] At least one other disclosed embodiment also provides a working method using the above-mentioned spring-adjustable electric rammer, including: the driving part 1 drives the piston rod 24 to move, drives the movable sleeve 23 to move through the impact spring 243, adjusts the size of the accommodating chamber 25, and the size of the accommodating chamber 25 is in a maximum state after the piston rod 24 stops for a period of time, and when the piston rod 24 moves, the lubricating oil in the pressure chamber 26 hinders the movable sleeve 23 from moving upward, so that the size of the accommodating chamber 25 is smaller than the maximum state; and when the piston rod 24 moves downward, the impact plate 28 is driven to impact through the inner cylinder sleeve 22.

[0092] In summary, the spring-adjustable electric rammer comprises: a driving part 1 and an impact part 2; the driving part 1 is connected to the impact part 2, and the driving part 1 drives the impact part 2 to impact; the impact part 2 comprises: a first guide cylinder 21, and an inner cylinder sleeve 22 slidably arranged in the first guide cylinder 21; a piston rod 24 is passed through the inner cylinder sleeve 22, and the piston rod 24 is connected to the driving part 1; a movable sleeve 23 is sleeved on the piston rod 24, and a ring body 231 whose outer wall contacts the inner wall of the inner cylinder sleeve 22 is provided on the movable sleeve 23; a block 241 whose outer wall contacts the inner wall of the inner cylinder sleeve 22 is provided on the piston rod 24, and the block 241 is located below the movable sleeve 23; the block 241 and the ring body 231 are connected to each other. An accommodating chamber 25 is formed between the ring body 231 and the inner top surface of the movable sleeve 23, and a pressure chamber 26 is formed between the block 241 and the ring body 231; an impact spring 243 is connected between the block 241 and the ring body 231; the driving part 1 drives the piston rod 24 to move, and drives the movable sleeve 23 to move through the impact spring 243 to adjust the size of the accommodating chamber 25. After the piston rod 24 stops for a period of time, the size of the accommodating chamber 25 is in the maximum state, and when the piston rod 24 moves, the lubricating oil in the pressure chamber 26 hinders the movable sleeve 23 from moving upward, so that the size of the accommodating chamber 25 is smaller than the maximum state, thereby achieving the goal of keeping the impact spring 243 in a balanced state when the rammer is stopped, and avoiding the impact spring 243 remaining in a compressed state for a long time, which will cause its rigidity and elastic performance to decrease.

[0093] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0094] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0095] Spatially relative terms, such as "inside," "outside," "below," "beneath," "down," "above," "on," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "below" or "below" other elements or features will be oriented to be "above" the other elements or features. Thus, the example term "below" may encompass both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0096] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A spring-adjustable electric rammer, characterized in that: include: A driving portion (1) and an impact portion (2); The driving part (1) is connected to the impact part (2) to drive the impact part (2) to impact; in The impact portion (2) comprises: A first guide cylinder (21), and an inner cylinder sleeve (22) slidably disposed within the first guide cylinder (21); Wherein, a piston rod (24) is passed through the inner cylinder sleeve (22), and the piston rod (24) is connected to the driving part (1); The piston rod (24) is sleeved with a movable sleeve (23), and the movable sleeve (23) is provided with a ring body (231) whose outer wall contacts the inner wall of the inner cylinder sleeve (22); and the end of the piston rod (24) is provided with a block body (241) whose outer wall contacts the inner wall of the inner cylinder sleeve (22); The block (241) is located below the movable sleeve (23), and a receiving chamber (25) is formed between the block (241) and the ring body (231), and a pressure chamber (26) is formed between the ring body (231) and the inner top surface of the inner cylinder sleeve (22); wherein an impact spring (243) is connected between the block (241) and the ring body (231); The driving portion (1) drives the piston rod (24) to move, and drives the movable sleeve (23) to move via the impact spring (243), thereby adjusting the size of the accommodating chamber (25). After the piston rod (24) stops for a period of time, the size of the accommodating chamber (25) is at a maximum state, and when the piston rod (24) moves, the lubricating oil in the pressure chamber (26) hinders the movable sleeve (23) from moving upward, so that the size of the accommodating chamber (25) is smaller than the maximum state. The top surface of the inner cylinder sleeve (22) is in a sealed state, and a through hole (221) is provided thereon, and the piston rod (24) is arranged through the through hole (221); The top surface of the inner cylinder sleeve (22) is provided with a plurality of oil inlet holes (222) communicating with the pressure chamber (26), and a one-way valve is provided in each of the oil inlet holes (222); The top of the piston rod (24) is connected to a slider (242), the side wall of the slider (242) contacts the inner wall of the first guide cylinder (21), and an oil chamber (27) is formed between the slider (242) and the top surface of the inner cylinder sleeve (22). Lubricating oil in the oil chamber (27) enters the pressure chamber (26) through the oil inlet hole (222); The movable sleeve (23) is provided with an oil leakage hole (232) so as to connect the pressure chamber (26) and the accommodating chamber (25) through the oil leakage hole (232); The oil leakage hole (232) is smaller than the oil inlet hole (222); When the piston rod (24) moves to the highest position and stops moving, the lubricating oil in the pressure chamber (26) is discharged through the oil leakage hole (232), so that the movable sleeve (23) moves upward until the ring body (231) contacts the inner top surface of the inner cylinder sleeve (22); The bottom surface of the inner cylinder sleeve (22) is connected to the impact plate (28); The bottom surface of the inner cylinder sleeve (22) is open; A damping spring (281) is connected between the block (241) and the impact plate (28); When the piston rod (24) moves downward, it drives the impact plate (28) to impact through the inner cylinder sleeve (22).

2. The spring-adjustable electric rammer according to claim 1, characterized in that: After the electric rammer stops for a period of time, the ring body (231) contacts the inner top surface of the inner cylinder sleeve (22), and the accommodating cavity (25) is in the maximum state. At this time, the piston rod (24) moves upward to the highest position, and the impact spring (243) is in a balanced state; After the electric rammer is started, when the piston rod (24) moves downward to the lowest position for the first time, the impact spring (243) drives the movable sleeve (23) to move downward, so that the accommodating chamber (25) decreases and the pressure chamber (26) increases. At this time, lubricating oil is introduced into the pressure chamber (26) to fill the pressure chamber (26); When the pressure chamber (26) is filled with lubricating oil, when the piston rod (24) moves upward to the highest position, the impact spring (243) is in a compressed state, and the lubricating oil in the pressure chamber (26) hinders the upward movement of the movable sleeve (23).

3. The spring-adjustable electric rammer according to claim 1, characterized in that: The inner cylinder sleeve (22) is also provided with a second guide cylinder (29). The second guide cylinder (29) is connected to the inner cylinder sleeve (22), and a bellows (291) is connected between the second guide cylinder (29) and the first guide cylinder (21).

4. The spring-adjustable electric rammer according to claim 1, characterized in that: The driving unit (1) comprises: a driving motor (11) and a transmission mechanism (13); The driving motor (11) is arranged on a housing (12), and the first guide cylinder (21) is connected to the housing (12); The transmission mechanism (13) is arranged in the housing (12), and the transmission mechanism (13) is connected to the drive motor (11) and the slider (242); The driving motor (11) drives the slider (242) to move via the transmission mechanism (13), thereby driving the piston rod (24) to move.

5. The spring-adjustable electric rammer according to claim 4, characterized in that: The transmission mechanism (13) comprises: a first helical gear (131) and a second helical gear (132); The first helical gear (131) is connected to the output shaft of the drive motor (11) via a clutch (14); The second helical gear (132) is rotatably disposed in the housing (12), and the second helical gear (132) is meshed with the first helical gear (131); A column (133) is eccentrically provided on one surface of the second helical gear (132) in the thickness direction, and the column (133) is parallel to the axis of the second helical gear (132); The column (133) is connected to a connecting rod (135) via a bearing (134), and the connecting rod (135) is rotatably connected to the slider (242); The driving motor (11) drives the first bevel gear (131) to rotate, thereby driving the second bevel gear (132) to rotate, and further driving the piston rod (24) to repeatedly move up and down through the connecting rod (135).

6. The spring-adjustable electric rammer according to claim 4, characterized in that: A gripping portion (3) is rotatably provided on the top of the housing (12), and a battery box (31) for supplying power to the driving motor (11) is provided in the gripping portion (3).

7. A method for operating the spring-adjustable electric rammer according to claim 1, characterized in that: include: The driving part (1) drives the piston rod (24) to move, and drives the movable sleeve (23) to move through the impact spring (243), thereby adjusting the size of the accommodating chamber (25). After the piston rod (24) stops for a period of time, the size of the accommodating chamber (25) is at a maximum state, and when the piston rod (24) moves, the lubricating oil in the pressure chamber (26) hinders the movable sleeve (23) from moving upward, so that the size of the accommodating chamber (25) is smaller than the maximum state; and When the piston rod (24) moves downward, it drives the impact plate (28) to impact through the inner cylinder sleeve (22).

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