CN111618794A - Rubber hammer for electric power construction - Google Patents
Rubber hammer for electric power construction Download PDFInfo
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- CN111618794A CN111618794A CN202010572257.XA CN202010572257A CN111618794A CN 111618794 A CN111618794 A CN 111618794A CN 202010572257 A CN202010572257 A CN 202010572257A CN 111618794 A CN111618794 A CN 111618794A
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- rubber hammer
- particles
- buffer spring
- rod
- buffer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D1/00—Hand hammers; Hammer heads of special shape or materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D1/00—Hand hammers; Hammer heads of special shape or materials
- B25D1/12—Hand hammers; Hammer heads of special shape or materials having shock-absorbing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G1/00—Handle constructions
- B25G1/01—Shock-absorbing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25G—HANDLES FOR HAND IMPLEMENTS
- B25G1/00—Handle constructions
- B25G1/04—Handle constructions telescopic; extensible; sectional
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a rubber hammer for electric power construction, which comprises a fixing ring, a rubber hammer and a rod body, wherein a lifting structure is movably connected inside the rod body, the bottom end of the lifting structure is movably connected with a mounting groove, the top end of the mounting groove is provided with the fixing ring, the rubber hammer is clamped inside the fixing ring, a damping structure is arranged inside the rubber hammer, and the damping structure comprises a cavity, a connecting block, a first buffer spring and a second buffer spring. According to the invention, the damping structure is arranged in the rubber hammer, so that the rubber hammer can be stressed and buffered by the internal damping structure when in contact with a contact object to apply force in use, the cavity is arranged in the rubber hammer, the first buffer spring and the second buffer spring are arranged in the cavity to support and fill the cavity, so that the rubber hammer is internally digested by the stress of the internal buffer spring when being stressed, the hand vibration sense is reduced, the rubber hammer is more comfortable to use, and the damping and buffering effects are better.
Description
Technical Field
The invention relates to the technical field of rubber hammers, in particular to a rubber hammer for electric power construction.
Background
Electric power engineering need use the rubber hammer to strike the application of force fixed to the object in the work progress, and the rubber hammer has insulating protective action, can effectively completely cut off electric power, needs one kind now to use and shakes the slight rubber hammer for construction of pole, but there are many problems or defects in the rubber hammer for electric power construction that has now:
traditional rubber hammer for electric power construction is when using the rubber hammer atress vibration sense to transmit the arm when strikeing, and the arm vibration sense is great, and use comfort is not high.
Disclosure of Invention
The invention aims to provide a rubber hammer for electric power construction, which solves the problem that the prior art has large vibration feeling on the arm and low comfort when in use.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a rubber hammer for electric power construction, includes solid fixed ring, rubber hammer and the body of rod, the inside swing joint of the body of rod has elevation structure, and elevation structure's bottom swing joint has the mounting groove, the top of mounting groove is provided with solid fixed ring, and solid fixed ring's inside joint has the rubber hammer, the inside of rubber hammer is provided with shock-absorbing structure, and shock-absorbing structure includes cavity, connecting block, first buffer spring and second buffer spring, the inside of rubber hammer is provided with the cavity, and fixedly connected with connecting block on the inside wall of cavity, the first buffer spring of fixedly connected with between the connecting block, fixedly connected with second buffer spring between the connecting block.
Preferably, the inside of solid fixed ring is provided with the notch, and the inside threaded connection of notch has the gim peg, be provided with the joint groove on the lateral wall of rubber hammer.
Preferably, the two sides of the rubber hammer are provided with buffer particles, and the buffer particles are uniformly filled on the two sides of the rubber hammer.
Preferably, the first buffer spring and the second buffer spring are filled and installed in the cavity, and the first buffer spring and the second buffer spring are symmetrically distributed in the cavity.
Preferably, elevation structure includes movable rod, preformed groove, elastic block, elastic ring and recess, the inside swing joint of the body of rod has the movable rod, and is provided with the recess on the lateral wall of movable rod, the inside fixedly connected with elastic ring of recess.
Preferably, one side fixedly connected with elasticity piece of elasticity circle, be provided with the reservation groove on the lateral wall of the body of rod, the reservation groove is equidistant range distribution on the lateral wall of the body of rod.
Preferably, the scale is marked on one side of the rod body, each small grid represents 1mm, and the total size is 10cm, so that the scale is formed, and the measuring function is obtained.
Preferably, before the buffer particles are arranged on both sides of the rubber hammer: selecting said buffer particles from a collection of particles as follows:
after the buffer particles to be selected in the particle set are placed on an electron microscope, recording the physical structure of the buffer particles to be selected;
pressing the buffer particles to be selected to different degrees, and recording the recovery degree and recovery time of the buffer particles to be selected;
soaking the buffer particles to be selected in water, and recording the shape change of the buffer particles to be selected;
placing the buffer particles to be selected in a high-temperature environment, and detecting the heat resistance degree of the buffer particles to be selected;
selecting optimal buffer particles based on the physical structure, the recovery degree, the recovery time, the shape change and the heat resistance degree;
prompting to dispose the selected optimal cushioning particles on both sides of the rubber hammer.
Preferably, the length of the rod body of the rubber hammer is judged, and the judging process comprises the following steps: an alarm is arranged on the rod body,
calculating the damping efficiency mu of the damping structure according to the following formula:
wherein ξ denotes the damping ratio of the shock-absorbing structure,
denotes a natural frequency of the vibration damping structure, wherein k denotes a first damper spring and a second damper springM represents the total mass of the first buffer spring, the connecting block and the second buffer spring, and f represents the disturbance frequency of the damping structure;
calculating the length X of the rod body according to the following formula:
mu represents the damping efficiency of the damping structure, F represents the stress magnitude of the rubber hammer, and W represents the work magnitude of the rubber hammer on the implementation object;
setting a movable rod of the lifting structure to select the corresponding optimal rod body length,
judging whether the length of the optimal rod body meets the preset requirement or not,
if the rod body is in accordance with the optimal rod body, performing first alarm reminding, and reserving the optimal rod body;
otherwise, carrying out second alarm reminding, and reselecting the new optimal rod body length.
Compared with the prior art, the invention has the beneficial effects that: this rubber hammer for electric power construction is rational in infrastructure, has following advantage:
(1) the lifting structure is arranged in the rod body, the overall length of the rod body can be adjusted according to different requirements of construction positions during use, so that the construction is more labor-saving, the elastic block is pressed during use, the movable rod is adjusted in position in the rod body, the elastic block can be loosened after the position is determined, the elastic ring in the groove in the outer wall of the movable rod loses fixing force and is clamped with the reserved groove arranged on the outer wall of the rod body to finish the position fixing after the movable rod is adjusted, the size of the elastic block is smaller, the force application of the hand-held rod body is not influenced, the length of the rod body can be adjusted through the arrangement, and the use is more convenient and labor-saving;
(2) the damping structure is arranged in the rubber hammer, so that the rubber hammer can be stressed and buffered by the internal damping structure when in contact with a contact object to apply force in use, the cavity is arranged in the rubber hammer, the first buffer spring and the second buffer spring are arranged in the cavity to support and fill the interior of the cavity, the internal buffer spring is stressed to digest the interior of the rubber hammer when the rubber hammer is stressed, the vibration feeling of hands is reduced, the rubber hammer is more comfortable to use, and the damping and buffering effects are better;
(3) through being provided with the notch in solid fixed ring's inside, rubber hammer joint is in solid fixed ring inside back during the use, can hammer the joint groove joint of outer wall setting with the notch that the gim peg passes through solid fixed ring inside and sets up with the rubber, and it is more firm to make rubber hammer and solid fixed ring joint installation.
Drawings
FIG. 1 is a schematic front sectional view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a front view of the lifting structure of the present invention;
FIG. 4 is a front view of the shock absorbing structure of the present invention;
fig. 5 is an enlarged schematic view of a portion a in fig. 2 according to the present invention.
In the figure: 1. buffering the particles; 2. a fixing ring; 3. a fixing bolt; 4. a rubber hammer; 5. a shock-absorbing structure; 501. A cavity; 502. connecting blocks; 503. a first buffer spring; 504. a second buffer spring; 6. a shaft body; 7. a lifting structure; 701. a movable rod; 702. reserving a groove; 703. an elastic block; 704. an elastic ring; 705. A groove; 8. mounting grooves; 9. a notch; 10. a clamping groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, an embodiment of the present invention is shown: a rubber hammer for electric power construction comprises a fixing ring 2, a rubber hammer 4 and a rod body 6, wherein the inside of the rod body 6 is movably connected with a lifting structure 7, the lifting structure 7 comprises a movable rod 701, a reserved groove 702, an elastic block 703, an elastic ring 704 and a groove 705, the inside of the rod body 6 is movably connected with the movable rod 701, the groove 705 is formed in the outer side wall of the movable rod 701, and the elastic ring 704 is fixedly connected inside the groove 705;
one side of the elastic ring 704 is fixedly connected with an elastic block 703, the outer side wall of the rod body 6 is provided with reserved grooves 702, and the reserved grooves 702 are arranged and distributed on the outer side wall of the rod body 6 at equal intervals;
specifically, as shown in fig. 1 and 3, during use, the lifting structure 7 is arranged inside the rod body 6, so that the overall length of the rod body 6 can be adjusted according to different requirements of construction positions during use, construction is more labor-saving, and the elastic block 703 is pressed during use, so that the movable rod 701 is adjusted in position inside the rod body 6.
After the position is determined, the elastic block 703 can be released, so that the elastic ring 704 in the groove 705 on the outer wall of the movable rod 701 loses the fixing force and is clamped with the reserved groove 702 on the outer wall of the rod body 6 to finish the position fixing of the adjustable movable rod 701, the size of the elastic block 703 is small, the force application of the hand-held rod body 6 is not influenced, the length of the rod body 6 can be adjusted through the setting, and the use is more convenient and labor-saving;
the bottom end of the lifting structure 7 is movably connected with a mounting groove 8, the top end of the mounting groove 8 is provided with a fixing ring 2, a notch 9 is formed in the fixing ring 2, the inner thread of the notch 9 is connected with a fixing bolt 3, the outer side wall of the rubber hammer 4 is provided with a clamping groove 10, the notch 9 is formed in the fixing ring 2, when the rubber hammer 4 is used, the fixing bolt 3 can be clamped with the clamping groove 10 formed in the outer wall of the rubber hammer 4 through the notch 9 formed in the fixing ring 2, and the rubber hammer 4 and the fixing ring 2 are firmly clamped;
the rubber hammer 4 is clamped inside the fixing ring 2, the buffering particles 1 are arranged on two sides of the rubber hammer 4, and the buffering particles 1 are uniformly filled on two sides of the rubber hammer 4, so that the rubber hammer 4 has a better damping and buffering effect;
a damping structure 5 is arranged inside the rubber hammer 4, the damping structure 5 comprises a cavity 501, a connecting block 502, a first buffer spring 503 and a second buffer spring 504, the cavity 501 is arranged inside the rubber hammer 4, the connecting block 502 is fixedly connected to the inner side wall of the cavity 501, the first buffer spring 503 is fixedly connected between the connecting blocks 502, and the second buffer spring 504 is fixedly connected between the connecting blocks 502;
the first buffer spring 503 and the second buffer spring 504 are filled and installed inside the cavity 501, and the first buffer spring 503 and the second buffer spring 504 are symmetrically distributed inside the cavity 501;
specifically, as shown in fig. 1 and 4, during use, the damping structure 5 is arranged in the rubber hammer 4, when the rubber hammer 4 is in use, the rubber hammer 4 can be buffered by the internal damping structure 5 when in contact with a contact object for force application, the cavity 501 is arranged in the rubber hammer 4, the first buffer spring 503 and the second buffer spring 504 are arranged in the cavity 501, the cavity 501 is internally supported and filled, the internal digestion is carried out by the internal buffer spring when the rubber hammer 4 is stressed, the hand vibration is reduced, the use is more comfortable, and the damping and buffering effects are better.
The working principle is as follows: when the electric power construction device is used, the rubber hammer 4 is aligned to a part needing to be knocked by the hand-held rod body 6 to apply force to complete an electric power construction part, firstly, the lifting structure 7 is arranged in the rod body 6, the whole length of the rod body 6 can be adjusted according to different requirements of construction positions when the electric power construction device is used, the elastic block 703 is pressed when the electric power construction device is used, the position of the movable rod 701 is adjusted in the rod body 6, the elastic block 703 can be released after the position is determined, the elastic ring 704 in the groove 705 on the outer wall of the movable rod 701 loses the fixing force and is clamped with the reserved groove 702 on the outer wall of the rod body 6 to complete the position fixing after the adjustment of the movable rod 701, the size of the elastic block 703 is small, the force application of the hand-held rod body 6 is not influenced;
secondly, the damping structure 5 is arranged in the rubber hammer 4, when the rubber hammer 4 is in contact with a contact object for force application, the internal damping structure 5 can be used for bearing and buffering, the cavity 501 is arranged in the rubber hammer 4, the first buffer spring 503 and the second buffer spring 504 are arranged in the cavity 501, the cavity 501 is supported and filled, when the rubber hammer 4 is stressed, the internal buffer springs bear force for internal digestion, the hand vibration feeling is reduced, the use of the rubber hammer is more comfortable, and the damping and buffering effects are better;
finally, through the inside at solid fixed ring 2 be provided with notch 9, the inside back of rubber hammer 4 joint in solid fixed ring 2 during the use, can be with the joint groove 10 joint of 3 through the notch 9 of the inside setting of solid fixed ring 2 and the setting of 4 outer walls of rubber hammer of gim peg, make the installation of rubber hammer 4 and solid fixed ring 2 joint more firm.
The embodiment provided by the invention comprises the following steps: a scale is calibrated on one side of a rod body 6, each small grid represents 1mm, the total size is 10cm, and a graduated scale is formed, so that the measuring function is obtained.
Before the two sides of the rubber hammer are provided with buffer particles: selecting said buffer particles from a collection of particles as follows:
after the buffer particles to be selected in the particle set are placed on an electron microscope, recording the physical structure of the buffer particles to be selected;
pressing the buffer particles to be selected to different degrees, and recording the recovery degree and recovery time of the buffer particles to be selected;
soaking the buffer particles to be selected in water, and recording the shape change of the buffer particles to be selected;
placing the buffer particles to be selected in a high-temperature environment, and detecting the heat resistance degree of the buffer particles to be selected;
selecting optimal buffer particles based on the physical structure, the recovery degree, the recovery time, the shape change and the heat resistance degree;
prompting to dispose the selected optimal cushioning particles on both sides of the rubber hammer.
The beneficial effect of above-mentioned design is: based on physical structure, degree of recovery, recovery time, shape change, heat-resisting degree, select optimum buffering granule, obtain better buffering effect, reduce the hand and shake and feel, the shock attenuation effect is obvious.
The embodiment provided by the invention comprises the following steps: the utility model provides a rubber hammer for electric power construction, judges the length of the body of rod 6 of rubber hammer, and its judgement process includes:
an alarm is arranged on the rod body 6,
the damping efficiency μ of the damping structure 5 is calculated according to the following formula:
wherein ξ denotes the damping ratio of the shock-absorbing structure 5,
a natural frequency of the damping structure 5 is represented, where k represents a standard stiffness coefficient of the first and second buffer springs 501 and 503, m represents a total mass of the first buffer spring 501, the connecting block 502, and the second buffer spring 503, and f represents a disturbance frequency of the damping structure 5;
the length X of the rod 6 is calculated according to the following formula:
μ represents the damping efficiency of the damping structure 5, F represents the magnitude of the force applied to the rubber hammer 4, and W represents the magnitude of the work applied to the object to be implemented by the rubber hammer 4;
the movable rod 701 of the lifting structure 7 is set to select the corresponding optimal rod body length,
judging whether the length of the optimal rod body meets the preset requirement or not,
if the rod body is in accordance with the optimal rod body, performing first alarm reminding, and reserving the optimal rod body;
otherwise, carrying out second alarm reminding, and reselecting the new optimal rod body length.
In this embodiment, the preset requirement means that the selected optimal rod body can achieve a good damping effect in the operation process of the rubber hammer for electric power construction.
In this embodiment, the magnitude of the force applied to the rubber hammer 4 is based on the magnitude of the force that the force application object reacts to the rubber hammer 4 when the force application object is applied by the rubber hammer for power construction.
In this embodiment, the amount of work done by the rubber hammer 4 is based on the work done by the rubber hammer for power construction during the process of applying force to the object to be applied with force.
The beneficial effect of above-mentioned design is: obtain the best body of rod length through the calculation, operation elevation structure removes to set up the best body of rod length, and if the body of rod length of choosing is not conform to the requirement, the alarm on the body of rod reports to the police to reselect new body of rod length, until meeting the requirement, through setting up the best body of rod length, make rubber hammer shock-absorbing structure's for electric power construction shock attenuation efficiency highest, reduce arm vibration and feel, improve operation comfort.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides a rubber hammer for electric power construction, includes solid fixed ring (2), rubber hammer (4) and the body of rod (6), its characterized in that: the inside swing joint of the body of rod (6) has elevation structure (7), and the bottom swing joint of elevation structure (7) has mounting groove (8), the top of mounting groove (8) is provided with solid fixed ring (2), and the inside joint of solid fixed ring (2) has rubber hammer (4), the inside of rubber hammer (4) is provided with shock-absorbing structure (5), and shock-absorbing structure (5) include cavity (501), connecting block (502), first buffer spring (503) and second buffer spring (504), the inside of rubber hammer (4) is provided with cavity (501), and fixedly connected with connecting block (502) on the inside wall of cavity (501), the first buffer spring (503) of fixedly connected with between connecting block (502), fixedly connected with second buffer spring (504) between connecting block (502).
2. The rubber hammer for electric power construction as claimed in claim 1, wherein: the inside of solid fixed ring (2) is provided with notch (9), and the inside threaded connection of notch (9) has gim peg (3), be provided with joint groove (10) on the lateral wall of rubber hammer (4).
3. The rubber hammer for electric power construction as claimed in claim 1, wherein: the rubber hammer is characterized in that buffering particles (1) are arranged on two sides of the rubber hammer (4), and the buffering particles (1) are uniformly filled on two sides of the rubber hammer (4).
4. The rubber hammer for electric power construction as claimed in claim 1, wherein: the first buffer spring (503) and the second buffer spring (504) are filled and installed inside the cavity (501), and the first buffer spring (503) and the second buffer spring (504) are symmetrically distributed inside the cavity (501).
5. The rubber hammer for electric power construction as claimed in claim 1, wherein: lifting structure (7) include movable rod (701), reserve groove (702), elastic block (703), elasticity circle (704) and recess (705), the inside swing joint of the body of rod (6) has movable rod (701), and is provided with recess (705) on the lateral wall of movable rod (701), the inside fixedly connected with elasticity circle (704) of recess (705).
6. The rubber hammer for electric power construction as claimed in claim 5, wherein: one side fixed connection elasticity piece (703) of elasticity circle (704), be provided with on the lateral wall of the body of rod (6) and reserve groove (702), reserve groove (702) are the equidistant range distribution on the lateral wall of the body of rod (6).
7. The rubber hammer for electric power construction as claimed in claim 1, wherein: and calibrating scales on one side of the rod body (6), wherein each small grid represents 1mm and is calibrated for 10cm in total to form a graduated scale, so that the measuring function is obtained.
8. A rubber hammer for electric power construction according to claim 3, wherein before the buffering particles (1) are arranged on both sides of the rubber hammer (4): selecting said buffer particles (1) from a collection of particles as follows:
after the buffer particles to be selected in the particle set are placed on an electron microscope, recording the physical structure of the buffer particles to be selected;
pressing the buffer particles to be selected to different degrees, and recording the recovery degree and recovery time of the buffer particles to be selected;
soaking the buffer particles to be selected in water, and recording the shape change of the buffer particles to be selected;
placing the buffer particles to be selected in a high-temperature environment, and detecting the heat resistance degree of the buffer particles to be selected;
selecting optimal buffer particles based on the physical structure, the recovery degree, the recovery time, the shape change and the heat resistance degree;
prompting to dispose the selected optimal cushioning particles on both sides of the rubber hammer (4).
9. The rubber hammer for electric power construction according to claim 1, further comprising: judge the length of the body of rod (6) of rubber hammer, its judgement process includes:
an alarm is arranged on the rod body (6),
the damping efficiency mu of the damping structure (5) is calculated according to the following formula:
wherein ξ represents the damping ratio of the shock-absorbing structure (5),
the natural frequency of the damping structure (5) is represented, wherein k represents the standard stiffness of the first (501) and second (503) damping springsThe coefficient m represents the total mass of the first buffer spring (501), the connecting block (502) and the second buffer spring (503), and f represents the disturbance force frequency of the damping structure (5);
calculating the length X of the rod body (6) according to the following formula:
mu represents the damping efficiency of the damping structure (5), F represents the stress magnitude of the rubber hammer (4), and W represents the work magnitude of the rubber hammer (4) on the implementation object;
a movable rod (701) of the lifting structure (7) is arranged to select the length of the corresponding optimal rod body,
judging whether the length of the optimal rod body meets the preset requirement or not,
if the rod body is in accordance with the optimal rod body, performing first alarm reminding, and reserving the optimal rod body;
otherwise, carrying out second alarm reminding, and reselecting the new optimal rod body length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010572257.XA CN111618794B (en) | 2020-06-22 | 2020-06-22 | Rubber hammer for electric power construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010572257.XA CN111618794B (en) | 2020-06-22 | 2020-06-22 | Rubber hammer for electric power construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111618794A true CN111618794A (en) | 2020-09-04 |
| CN111618794B CN111618794B (en) | 2021-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010572257.XA Active CN111618794B (en) | 2020-06-22 | 2020-06-22 | Rubber hammer for electric power construction |
Country Status (1)
| Country | Link |
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| CN (1) | CN111618794B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102459519B1 (en) * | 2021-07-29 | 2022-10-26 | 하헌근 | A hammer equipped with a means for reducing the impact recoil dispersion of the reinforcing earth block |
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| US20140259695A1 (en) * | 2013-03-15 | 2014-09-18 | Tech Swerve, Llc | Adjustable weight striking device |
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| KR102459519B1 (en) * | 2021-07-29 | 2022-10-26 | 하헌근 | A hammer equipped with a means for reducing the impact recoil dispersion of the reinforcing earth block |
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| CN111618794B (en) | 2021-08-10 |
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