A road material compaction detection device

Abstract

The present invention discloses a road material compaction detection device, which solves the problem that an ultrasonic probe is installed at the bottom of a detection vehicle and it is inconvenient to protect the ultrasonic probe. The device comprises a detection vehicle, wherein a chassis of the detection vehicle is provided with a bottom detection assembly, wherein the bottom detection assembly comprises an upper mounting frame fixedly mounted on the chassis of the detection vehicle, a lower mounting frame is provided below the upper mounting frame, connecting columns are symmetrically installed between the upper mounting frame and the lower mounting frame, a probe mounting unit is installed on the upper mounting frame, the probe mounting unit comprises a longitudinal mounting tube fixedly mounted on the middle part of the upper mounting frame and the lower mounting frame, and a fixed protective shell is installed at the bottom end of the longitudinal mounting tube; during operation, the ultrasonic probe is installed inside the fixed protective shell, and the fixed protective shell and two movable protective shells form a spherical shell-shaped cover on the outside of the ultrasonic probe, thereby protecting the ultrasonic probe.

Description

Technical Field

[0001] The invention belongs to the technical field of compaction detection, and in particular relates to a device for detecting the compaction of pavement materials. Background Art

[0002] The road material compaction detection device is a device that uses ultrasonic technology to detect the road surface. The ultrasonic detection of road surface compaction is mainly based on the propagation characteristics of ultrasonic waves in different media. When ultrasonic waves propagate in solid media, their propagation speed, amplitude and other parameters are closely related to the density, elastic modulus and other physical properties of the medium. For road materials, the higher the compaction, the greater the density of the material, the faster the propagation speed of ultrasonic waves, and the smaller the amplitude attenuation. By measuring parameters such as the propagation speed and amplitude change of ultrasonic waves in the road surface, the compaction of the corresponding position of the road surface can be inferred. When in use, the ultrasonic probe is generally installed downward at the bottom of the inspection vehicle. When testing, the inspection vehicle is driven to the position to be tested, and the test can be carried out. However, there are the following defects:

[0003] The ultrasonic probe is installed at the bottom of the inspection vehicle. When inspection is not needed, it is inconvenient to protect the ultrasonic probe, which may cause damage to the ultrasonic probe and affect subsequent use. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a road material compaction detection device, which effectively solves the problem that the ultrasonic probe is installed at the bottom of the detection vehicle, which makes it inconvenient to protect the ultrasonic probe.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a pavement material compaction detection device, comprising a detection vehicle, the chassis of the detection vehicle is provided with a bottom detection assembly;

[0006] The bottom detection assembly includes an upper mounting frame fixedly mounted on the chassis of the detection vehicle, a lower mounting frame is arranged below the upper mounting frame, connecting columns are symmetrically installed between the upper mounting frame and the lower mounting frame, and a probe mounting unit is installed on the upper mounting frame;

[0007] The probe mounting unit includes a longitudinal mounting tube fixedly mounted on the upper mounting frame and the middle part of the lower mounting frame, a fixed protective shell is mounted on the bottom end of the longitudinal mounting tube, an ultrasonic probe is mounted on the inner top wall of the fixed protective shell, the fixed protective shell is located below the lower mounting frame, an ultrasonic detector is arranged inside the inspection vehicle, a cable between the ultrasonic probe and the ultrasonic detector is mounted in the longitudinal mounting tube, and a rotation protection unit is arranged outside the fixed protective shell;

[0008] The rotation protection unit comprises two movable protection shells which are symmetrically hinged to the outside of the fixed protection shell, and a longitudinal driving unit for driving the movable protection shells to rotate is arranged on the outside of the longitudinal installation tube.

[0009] Preferably, fixed shafts are symmetrically installed at both ends of the fixed protective shell, the fixed shaft and the fixed protective shell are coaxially arranged, and a limiting plate is fixedly installed at the end of the fixed shaft. Two first slots are opened at the top of the fixed shaft, and two second slots are symmetrically opened on the top wall of the fixed protective shell. The two fixed shafts and the two second slots are respectively arranged on the four sides of the longitudinal mounting tube.

[0010] Preferably, the longitudinal driving unit includes a movable sleeve mounted on the outside of the longitudinal mounting tube, horizontal plates are symmetrically mounted on both sides of the movable sleeve, a longitudinal plate is fixedly mounted on one end of the horizontal plate away from the movable sleeve, the longitudinal plate is slidably mounted on the inner side of the guide groove, the guide groove is symmetrically opened on the lower mounting frame, a pressure plate is fixedly mounted on the bottom end of the longitudinal plate, the two pressure plates are respectively located above the two fixed shafts, and two pull ropes are symmetrically mounted on the bottom end of the movable sleeve.

[0011] Preferably, a screw barrel is installed on one of the horizontal plates, a screw rod is rotatably installed between the upper mounting frame and the lower mounting frame, the screw rod is threadedly connected to the screw barrel, the top end of the screw rod is fixedly connected to the output shaft of the motor, and the motor is fixedly installed on the horizontal plate.

[0012] Preferably, rotating clamping units are symmetrically installed at both ends of the movable protective shell, end grooves are opened on the sides where the two movable protective shells are close to each other, longitudinal mounting tubes are arranged on the inner sides of the two end grooves, counterweight blocks are installed on the ends of the two movable protective shells away from each other, and top clamping units are installed on the top of the movable protective shell. The two top clamping units are respectively located above the two second clamping grooves. The movable protective shell is arranged in a quarter-spherical shell shape, and the fixed protective shell is arranged in a hemispherical shell shape.

[0013] Preferably, the rotating clamping unit comprises two rotating rings rotatably mounted on the outside, connecting rods are fixedly mounted on the outsides of the two rotating rings, and the connecting rods on the two rotating rings are fixedly connected to the two movable protective shells respectively.

[0014] Preferably, a side tube is installed on the sides of the two rotating rings away from each other, a movable block is movably installed inside the side tube, a clamping block is installed on the side of the movable block close to the fixed shaft, the end of the clamping block contacts the outer wall of the fixed shaft, a first spring is fixedly installed on the side of the movable block close to the fixed shaft, one end of the first spring is fixedly connected to the top inner wall of the side tube, a pressure block is fixedly installed on the side of the movable block away from the fixed shaft, and one end of the pressure block passes through the side of the side tube away from the rotating ring.

[0015] Preferably, the top clamping unit includes a top box fixedly installed on the top of the movable protective shell, a movable plate is movably installed inside the top box, a clamping rod is fixedly installed on the bottom end of the movable plate, the bottom end of the clamping rod passes through the inner side of the movable protective shell, and the clamping rod is clamped into the inside of the second clamping slot, and a double-sided toothed plate is fixedly installed on the top of the movable plate, and gears are symmetrically meshed on both sides of the double-sided toothed plates.

[0016] Preferably, the gear is meshed with a single-sided toothed plate on one side away from the double-sided toothed plates, the top of the single-sided toothed plate passes through the top of the top box, a top plate is installed between the tops of the two single-sided toothed plates, the bottom ends of the two pull ropes are fixedly connected to the two top plates respectively, an internal groove is provided inside the single-sided toothed plate, an internal plate is provided inside the internal groove, a bottom rod is symmetrically installed at the bottom end of the internal plate, the bottom end of the bottom rod is fixedly connected to the inner bottom wall of the top box, a second spring is symmetrically installed at the top of the internal plate, and the top of the second spring is fixedly connected to the inner top wall of the internal groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1) During operation, the ultrasonic probe is installed inside the fixed protective shell, and two movable protective shells are installed on the upper outer side of the fixed protective shell. When the movable cover moves downward, it can drive the two movable protective shells to rotate downward along the outer wall of the fixed protective shell, so that the fixed protective shell and the two movable protective shells form a spherical shell covering the outer side of the ultrasonic probe, thereby protecting the ultrasonic probe; 2) During operation, pull ropes are installed between the top plates of the two movable protective shells and the movable sleeves, and the pull ropes generate an upward pulling force on the movable protective shells. When the movable sleeves move downward, the movable protective shells rotate downward and close under the action of the counterweight block, and when the movable sleeves move upward, the movable protective shells are pulled upward and rotated to open, thereby facilitating the use of the switch; 3) During operation, after the movable protective shell is rotated downward to close, the rotating ring rotates outside the fixed shaft until the pressure block is above the fixed shaft. At this time, the movable sleeve continues to move downward, so that the pressure plate pushes the pressure block downward, and the card block is inserted into the first card slot, thereby fixing the two movable protective shells and improving the protection stability; 4) During operation, the movable sleeve moves upward to pull the two movable protective shells to rotate to the outside of the upper part of the fixed protective shell, and then the movable sleeve continues to move upward, thereby pulling the single-side tooth plate upward, and then the card rod is driven downward through the gear and the double-side tooth plates to be inserted into the second card slot, thereby clamping and fixing the movable protective shell to ensure detection stability; 5) During operation, by fixing the protective shell to be set in a hemispherical shell shape, the curved surface design of the hemispherical protective shell can more effectively receive and reflect signals from different directions, thereby improving the detection range and accuracy of the detector. For ultrasonic detectors, the hemispherical protective shell can also focus the signal, further enhancing the detection effect, and improving the detection effect while completing the protection; 6) During operation, the spherical design of the protective shell has better ability to buffer and disperse impact force, effectively reducing the impact of the surrounding environment on the probe. At the same time, since the detection device is installed at the bottom of the detection vehicle, the streamlined design of the protective shell helps to reduce the air resistance encountered by the car during driving, thereby reducing fuel consumption and improving driving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached picture:

[0020] Figure 1 It is a schematic structural diagram of a pavement material compaction detection device of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the bottom detection component of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the probe installation unit of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the rotation protection unit of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the rotating clamping unit of the present invention;

[0025] Figure 6 It is a schematic diagram of the top clamping unit structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the internal structure of a single-sided tooth plate of the present invention.

[0027] In the figure: 1, detection vehicle; 2, bottom detection assembly; 201, upper mounting frame; 202, lower mounting frame; 203, connecting column; 204, probe mounting unit; 2041, longitudinal mounting tube; 2042, fixed protective shell; 2043, ultrasonic probe; 2044, fixed shaft; 2045, limit plate; 2046, first card slot; 2047, second card slot; 205, longitudinal drive unit; 2051, guide slot; 2052, movable sleeve; 2053, horizontal plate; 2054, longitudinal plate; 2055, pressure plate; 2056, screw barrel; 2057, screw rod; 2058, motor; 2059, pull rope; 206, rotating protection Protective unit; 2061, movable protective shell; 2062, end groove; 2063, counterweight; 207, rotating clamping unit; 2071, rotating ring; 2072, connecting rod; 2073, side tube; 2074, movable block; 2075, clamping block; 2076, first spring; 2077, pressure block; 208, top clamping unit; 2081, top box; 2082, movable plate; 2083, clamping rod; 2084, double-sided tooth plate; 2085, gear; 2086, single-sided tooth plate; 2087, top plate; 2088, internal groove; 2089, internal plate; 20810, bottom rod; 20811, second spring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Depend on Figure 1-7 The present invention relates to a pavement material compaction detection device, comprising a detection vehicle 1, the chassis of the detection vehicle 1 is provided with a bottom detection component 2;

[0030] The bottom detection assembly 2 includes an upper mounting frame 201 fixedly mounted on the chassis of the detection vehicle 1, a lower mounting frame 202 is arranged below the upper mounting frame 201, a connecting column 203 is symmetrically installed between the upper mounting frame 201 and the lower mounting frame 202, and a probe mounting unit 204 is installed on the upper mounting frame 201;

[0031] The probe mounting unit 204 includes a longitudinal mounting tube 2041 fixedly mounted on the upper mounting frame 201 and the middle part of the lower mounting frame 202. A fixed protective shell 2042 is mounted on the bottom end of the longitudinal mounting tube 2041. An ultrasonic probe 2043 is mounted on the inner top wall of the fixed protective shell 2042. The fixed protective shell 2042 is located below the lower mounting frame 202. An ultrasonic detector is arranged inside the inspection vehicle 1. The cable between the ultrasonic probe 2043 and the ultrasonic detector is installed in the longitudinal mounting tube 2041. A longitudinal driving unit is arranged on the outer side of the longitudinal mounting tube 2041. 205, a rotation protection unit 206 is arranged on the outer side of the fixed protective shell 2042, fixed shafts 2044 are symmetrically installed at both ends of the fixed protective shell 2042, the fixed shaft 2044 is coaxially arranged with the fixed protective shell 2042, a limiting plate 2045 is fixedly installed at the end of the fixed shaft 2044, two first slots 2046 are arranged on the top of the fixed shaft 2044, two second slots 2047 are symmetrically arranged on the top wall of the fixed protective shell 2042, and the two fixed shafts 2044 and the two second slots 2047 are respectively arranged on the four sides of the longitudinal mounting tube 2041.

[0032] The longitudinal drive unit 205 includes a movable sleeve 2052 mounted on the outer side of the longitudinal mounting tube 2041, and horizontal plates 2053 are symmetrically mounted on both sides of the movable sleeve 2052. A longitudinal plate 2054 is fixedly mounted on one end of the horizontal plate 2053 away from the movable sleeve 2052. The longitudinal plate 2054 is slidably mounted on the inner side of the guide groove 2051. The guide groove 2051 is symmetrically opened on the lower mounting frame 202. A pressing plate 2055 is fixedly mounted on the bottom end of the longitudinal plate 2054. The two pressing plates 2054 are fixedly mounted on the inner side of the guide groove 2051. 055 are respectively located above the two fixed shafts 2044, and two pull ropes 2059 are symmetrically installed at the bottom end of the movable sleeve 2052. A screw barrel 2056 is installed on one of the horizontal plates 2053, and a screw rod 2057 is rotatably installed between the upper mounting frame 201 and the lower mounting frame 202. The screw rod 2057 is threadedly connected to the screw barrel 2056, and the top end of the screw rod 2057 is fixedly connected to the output shaft of the motor 2058, and the motor 2058 is fixedly installed on the horizontal plate 2053.

[0033] The rotation protection unit 206 includes two movable protective shells 2061 symmetrically installed on the outside of the fixed protective shell 2042, the ultrasonic probe 2043 is installed inside the fixed protective shell 2042, and two movable protective shells 2061 are installed on the upper outside of the fixed protective shell 2042. When the movable sleeve 2052 moves downward, it can drive the two movable protective shells 2061 to rotate downward along the outer wall of the fixed protective shell 2042, so that the fixed protective shell 2042 and the two movable protective shells 2061 form a spherical shell cover on the outside of the ultrasonic probe 2043, thereby protecting the ultrasonic probe 2043. Rotational clamping units 207 are symmetrically installed at both ends of the movable protective shell 2061. An end groove 2062 is opened on the side where the two movable protective shells 2061 are close to each other, and the longitudinal mounting tube 2041 is arranged at the two end grooves 2 On the inner side of 062, a counterweight 2063 is installed at one end of the two movable protective shells 2061 away from each other, and a top clamping unit 208 is installed on the top of the movable protective shell 2061. The two top clamping units 208 are respectively located above the two second clamping slots 2047. The movable protective shell 2061 is arranged in a quarter-spherical shell shape, and the fixed protective shell 2042 is arranged in a hemispherical shell shape. Pull ropes 2059 are respectively installed between the top plates 2087 on the two movable protective shells 2061 and the movable sleeve 2052. The pull rope 2059 generates an upward pulling force on the movable protective shell 2061. When the movable sleeve 2052 moves downward, under the action of the counterweight 2063, the movable protective shell 2061 rotates downward to close, and when the movable sleeve 2052 moves upward, the movable protective shell 2061 is pulled to rotate upward to open, thereby facilitating the use of the switch.

[0034] The rotating clamping unit 207 includes two rotating rings 2071 rotatably installed on the outside, and connecting rods 2072 are fixedly installed on the outsides of the two rotating rings 2071. The connecting rods 2072 on the two rotating rings 2071 are respectively fixedly connected to the two movable protective shells 2061. Side tubes 2073 are installed on the sides of the two rotating rings 2071 away from each other, and a movable block 2074 is movably installed inside the side tube 2073. A clamping block 2075 is installed on the side of the movable block 2074 close to the fixed shaft 2044, and the end of the clamping block 2075 contacts the outer wall of the fixed shaft 2044. A first spring 2076 is fixedly installed on the side of the movable block 2074 close to the fixed shaft 2044. The first spring One end of the spring 2076 is fixedly connected to the top inner wall of the side tube 2073, and a pressure block 2077 is fixedly installed on the side of the movable block 2074 away from the fixed shaft 2044. One end of the pressure block 2077 passes through the side tube 2073 away from the rotating ring 2071. After the movable protective shell 2061 is rotated downward and closed, the rotating ring 2071 rotates on the outside of the fixed shaft 2044 until the pressure block 2077 is above the fixed shaft 2044. At this time, the movable sleeve 2052 continues to move downward, so that the pressure plate 2055 pushes the pressure block 2077 to move downward, so that the block 2075 is stuck in the first slot 2046, and the two movable protective shells 2061 are fixed to improve the protection stability.

[0035] The top clamping unit 208 includes a top box 2081 fixedly installed on the top of the movable protective shell 2061, a movable plate 2082 is movably installed inside the top box 2081, a clamping rod 2083 is fixedly installed on the bottom end of the movable plate 2082, the bottom end of the clamping rod 2083 passes through the inner side of the movable protective shell 2061, and the clamping rod 2083 is clamped into the inside of the second clamping groove 2047, and a double-sided tooth plate 2084 is fixedly installed on the top of the movable plate 2082, both sides of the double-sided tooth plate 2084 are symmetrically meshed with gears 2085, and the side of the gear 2085 away from the double-sided tooth plate 2084 is meshed with a single-sided tooth plate 2086, the top of the single-sided tooth plate 2086 passes through the top of the top box 2081, and a top plate 2087 is installed between the tops of the two single-sided tooth plates 2086, the bottom ends of the two pull ropes 2059 are fixedly connected to the two top plates 2087 respectively, and the single-sided tooth plate 2086 is meshed with the top of the top box 2081. An internal groove 2088 is provided inside the plate 2086, and an internal plate 2089 is arranged inside the internal groove 2088. A bottom rod 20810 is symmetrically installed at the bottom end of the internal plate 2089, and the bottom end of the bottom rod 20810 is fixedly connected to the inner bottom wall of the top box 2081. A second spring 20811 is symmetrically installed at the top of the internal plate 2089, and the top of the second spring 20811 is fixedly connected to the inner top wall of the internal groove 2088. After the movable sleeve 2052 moves upward to pull the two movable protective shells 2061 to rotate to the outside above the fixed protective shell 2042, the movable sleeve 2052 continues to move upward, thereby pulling the single-sided tooth plate 2086 to move upward, and then driving the clamping rod 2083 to move downward through the gear 2085 and the double-sided tooth plates 2084, so that it is clamped into the second clamping groove 2047, thereby clamping and fixing the movable protective shell 2061 to ensure detection stability.

[0036] Working principle: Ultrasonic detection of road compaction is mainly based on the propagation characteristics of ultrasound in different media. When ultrasound propagates in solid media, its propagation speed, amplitude and other parameters are closely related to the physical properties of the medium such as density and elastic modulus. For road materials, the higher the compaction, the greater the density of the material, the faster the propagation speed of ultrasound and the smaller the amplitude attenuation. By measuring parameters such as the propagation speed and amplitude change of ultrasound in the road surface, the compaction of the corresponding position of the road surface can be inferred. When performing compaction detection of road materials, drive the inspection vehicle 1 to the position of the road surface where the road compaction detection is required, turn on the ultrasonic generator, and the ultrasonic wave is emitted downward through the ultrasonic probe 2043 in the fixed protective shell 2042. The ultrasonic wave is received after reflection, and the compaction of the road surface is detected by calculating the propagation speed;

[0037] After the detection is completed, the motor 2058 is turned on to rotate the screw rod 2057, thereby driving the movable sleeve 2052 to move downward along the longitudinal mounting tube 2041. At this time, the single-sided tooth plate 2086 moves toward the side of the top box 2081 under the elastic force of the second spring 20811, and the gear 2085 is meshed and connected between the single-sided tooth plate 2086 and the double-sided tooth plate 2084, thereby driving the clamping rod 2083 to move upward, so that the clamping rod 2083 is disengaged from the second clamping groove 2047, and then the two movable protective shells 2061 rotate downward under the gravity of the counterweight block 2063 at the end until the bottom ends of the two movable protective shells 2061 are in contact, so that the fixed protective shell 2042 and the two movable protective shells 2061 play a protective role on the ultrasonic probe 2043;

[0038] During the rotation of the movable protective shell 2061, the rotating ring 2071 connected to the movable protective shell 2061 rotates outside the fixed shaft 2044 until the pressure block 2077 on one side of the rotating ring 2071 rotates to an upward position, and then the movable sleeve 2052 continues to move downward, so that the pressure plate 2055 pushes the pressure block 2077 to move downward, and pushes the clamping block 2075 to be clamped into the first clamping groove 2046, so that the two movable protective shells 2061 are clamped and fixed in the closed state, thereby improving the protection stability;

[0039] When it is needed, the movable sleeve 2052 is driven upward by the motor 2058 to move, so that the pressure plate 2055 is separated from the pressure block 2077, and the clamping block 2075 is disengaged from the first clamping slot 2046 under the elastic force of the first spring 2076, and then as the movable sleeve 2052 moves upward, the two movable protective shells 2061 are pulled upward and rotated under the pulling force of the two pull ropes 2059, so that the two movable protective shells 2061 are rotated to the upper outside of the fixed protective shell 2042, and when rotated to the open position, the movable sleeve 2052 continues to move upward, thereby pulling the single-sided tooth plate 2086 upward through the pull rope 2059, thereby pushing the double-sided tooth plate 2084 downward through the gear 2085, so that the clamping rod 2083 moves downward and is clamped into the second clamping slot 2047, thereby completing the clamping and fixation of the movable protective shell 2061.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A road material compaction detection device, comprising a detection vehicle (1), characterized in that: The chassis of the inspection vehicle (1) is provided with a bottom inspection component (2); The bottom detection assembly (2) comprises an upper mounting frame (201) fixedly mounted on the chassis of the detection vehicle (1); a lower mounting frame (202) is arranged below the upper mounting frame (201); connecting columns (203) are symmetrically mounted between the upper mounting frame (201) and the lower mounting frame (202); and a probe mounting unit (204) is mounted on the upper mounting frame (201); The probe mounting unit (204) comprises a longitudinal mounting tube (2041) fixedly mounted on the upper middle part of the upper mounting frame (201) and the lower mounting frame (202); a fixed protective shell (2042) is mounted on the bottom end of the longitudinal mounting tube (2041); an ultrasonic probe (2043) is mounted on the inner top wall of the fixed protective shell (2042); the fixed protective shell (2042) is located below the lower mounting frame (202); an ultrasonic detector is arranged inside the inspection vehicle (1); a cable between the ultrasonic probe (2043) and the ultrasonic detector is mounted inside the longitudinal mounting tube (2041); and a rotation protection unit (206) is arranged on the outer side of the fixed protective shell (2042); The rotation protection unit (206) comprises two movable protection shells (2061) symmetrically hinged to the outside of the fixed protection shell (2042), and a longitudinal driving unit (205) for driving the movable protection shells (2061) to rotate is arranged on the outside of the longitudinal installation tube (2041).

2. A road material compaction detection device according to claim 1, characterized in that: The two ends of the fixed protective shell (2042) are symmetrically mounted with fixed shafts (2044), the fixed shaft (2044) and the fixed protective shell (2042) are coaxially arranged, a limit plate (2045) is fixedly mounted on the end of the fixed shaft (2044), two first card slots (2046) are arranged at the top end of the fixed shaft (2044), two second card slots (2047) are symmetrically arranged on the top wall of the fixed protective shell (2042), and the two fixed shafts (2044) and the two second card slots (2047) are respectively arranged on the four sides of the longitudinal mounting tube (2041).

3. A road material compaction detection device according to claim 1, characterized in that: The longitudinal drive unit (205) comprises a movable sleeve (2052) sleeved and mounted on the outside of the longitudinal mounting tube (2041), transverse plates (2053) are symmetrically mounted on both sides of the movable sleeve (2052), a longitudinal plate (2054) is fixedly mounted on one end of the transverse plate (2053) away from the movable sleeve (2052), the longitudinal plate (2054) is slidably mounted on the inner side of the guide groove (2051), the guide groove (2051) is symmetrically opened on the lower mounting frame (202), a pressing plate (2055) is fixedly mounted on the bottom end of the longitudinal plate (2054), the two pressing plates (2055) are respectively located above the two fixed shafts (2044), and two pull ropes (2059) are symmetrically mounted on the bottom end of the movable sleeve (2052).

4. A road material compaction detection device according to claim 3, characterized in that: A screw barrel (2056) is installed on one of the horizontal plates (2053), a screw rod (2057) is rotatably installed between the upper mounting frame (201) and the lower mounting frame (202), the screw rod (2057) is threadedly connected to the screw barrel (2056), the top end of the screw rod (2057) is fixedly connected to the output shaft of the motor (2058), and the motor (2058) is fixedly installed on the horizontal plate (2053).

5. A road material compaction detection device according to claim 1, characterized in that: Rotating clamping units (207) are symmetrically mounted at both ends of the movable protective shell (2061); end grooves (2062) are provided on the sides of the two movable protective shells (2061) that are close to each other; longitudinal mounting tubes (2041) are arranged inside the two end grooves (2062); counterweights (2063) are mounted on the ends of the two movable protective shells (2061) that are away from each other; top clamping units (208) are mounted on the tops of the movable protective shells (2061); the two top clamping units (208) are respectively located above the two second clamping grooves (2047); the movable protective shell (2061) is arranged in a quarter spherical shell shape, and the fixed protective shell (2042) is arranged in a hemispherical shell shape.

6. A road material compaction detection device according to claim 5, characterized in that: The rotating clamping unit (207) comprises two rotating rings (2071) rotatably mounted on the outside, connecting rods (2072) are fixedly mounted on the outsides of the two rotating rings (2071), and the connecting rods (2072) on the two rotating rings (2071) are respectively fixedly connected to the two movable protective shells (2061).

7. A road material compaction detection device according to claim 6, characterized in that: A side tube (2073) is installed on the sides of the two rotating rings (2071) away from each other, a movable block (2074) is movably installed inside the side tube (2073), a clamping block (2075) is installed on the side of the movable block (2074) close to the fixed shaft (2044), the end of the clamping block (2075) contacts the outer wall of the fixed shaft (2044), a first spring (2076) is fixedly installed on the side of the movable block (2074) close to the fixed shaft (2044), one end of the first spring (2076) is fixedly connected to the top inner wall of the side tube (2073), and a pressure block (2077) is fixedly installed on the side of the movable block (2074) away from the fixed shaft (2044), and one end of the pressure block (2077) passes through the side of the side tube (2073) away from the rotating ring (2071).

8. A road material compaction detection device according to claim 5, characterized in that: The top clamping unit (208) comprises a top box (2081) fixedly mounted on the top of the movable protective shell (2061); a movable plate (2082) is movably mounted inside the top box (2081); a clamping rod (2083) is fixedly mounted on the bottom end of the movable plate (2082); the bottom end of the clamping rod (2083) penetrates the inner side of the movable protective shell (2061), and the clamping rod (2083) is clamped into the inside of the second clamping groove (2047); a double-sided toothed plate (2084) is fixedly mounted on the top of the movable plate (2082); and gears (2085) are symmetrically meshed on both sides of the double-sided toothed plate (2084).

9. A road material compaction detection device according to claim 8, characterized in that: The gear (2085) is meshedly connected with a single-sided toothed plate (2086) on one side away from the double-sided toothed plates (2084). The top end of the single-sided toothed plate (2086) penetrates the top end of the top box (2081). A top plate (2087) is installed between the top ends of the two single-sided toothed plates (2086). The bottom ends of the two pull ropes (2059) are fixedly connected to the two top plates (2087) respectively. The single-sided toothed plate (2086) is provided with an internal groove ( 2088), an inner plate (2089) is arranged inside the inner groove (2088), a bottom rod (20810) is symmetrically installed at the bottom end of the inner plate (2089), the bottom end of the bottom rod (20810) is fixedly connected to the inner bottom wall of the top box (2081), and a second spring (20811) is symmetrically installed at the top end of the inner plate (2089), and the top end of the second spring (20811) is fixedly connected to the inner top wall of the inner groove (2088).

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