Portable geochemical element analyzer

Abstract

The application provides a portable geochemical element analyzer, which comprises a base and a workbench, the base is provided with a translation mechanism, the translation mechanism is provided with a sample storage mechanism, the bottom end of the workbench is provided with a cutting mechanism for cutting samples, the workbench is provided with an element analysis device, and the base is further provided with a power mechanism for driving the translation mechanism and the cutting mechanism. In the application, the power mechanism is arranged on the base, the translation mechanism and the cutting mechanism are synchronously driven by the power mechanism, the stone sample is transported along the tangent direction of the cutting blade by the translation mechanism, the sample is cut by the cutting blade, the upper surface of the sample is cut into a plane, the upper surface of the stone sample is identified by a visual sensor arranged on the workbench, the upper surface of the stone sample is detected by an infrared detection device, and thus the element content of the stone sample is analyzed.

Description

Technical Field

[0001] This invention belongs to the field of geochemical element analysis technology, and specifically relates to a portable geochemical element analyzer. Background Technology

[0002] In the fields of geological science and engineering, accurate analysis of trace elements in rock samples is crucial for understanding geological origins, environmental changes, and resource distribution.

[0003] Currently, the analyzer lacks sample pretreatment, and a separate cutting device is required when cutting rocks, which is inconvenient to carry. Furthermore, manual repositioning is required for testing at different points. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a portable geochemical element analyzer that addresses the shortcomings of the prior art. This geochemical element analyzer can automatically cut stone samples and perform elemental analysis through an infrared detection device after cutting, enabling efficient multi-point detection and widespread application.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a portable geochemical element analyzer, characterized in that it includes a base and a worktable, a translation mechanism is provided on the base, a sample storage mechanism is provided on the translation mechanism for storing samples, a cutting mechanism is provided at the bottom of the worktable for cutting samples to make the upper surface of the samples flat, an element analysis device is provided on the worktable, a dustproof plate is provided between the cutting mechanism and the element analysis device on the worktable, and a power mechanism for driving the translation mechanism and the cutting mechanism is also provided on the base.

[0006] Preferably, the translation mechanism includes three equally spaced first mounting seats, a first mounting shaft rotatably mounted on the side of each first mounting seat, a first gear fixedly mounted on the first mounting shaft, and translation racks meshing with the first gears on the three first gears. The transmission ratio between the translation racks and the first gears is 1:110. The sample storage mechanism is fixedly mounted on the translation racks. A first bevel gear, which is connected to the power mechanism, is also fixedly mounted on the first mounting shaft in the middle. The first bevel gear meshes with a third bevel gear.

[0007] The third bevel gear drives the first bevel gear to rotate, causing the first mounting shaft and the first gear in the middle to rotate. This, in turn, drives the translation rack to move laterally, simultaneously rotating the other two first gears. The two outer first gears support the translation rack. The movement of the translation rack moves the sample storage mechanism on it, causing the sample in the sample box to be cut by the cutting mechanism. After cutting, the upper surface of the sample is a smooth plane for testing.

[0008] Preferably, the sample storage mechanism includes a housing and a sample box that is vertically slidably installed inside the housing. The bottom end of the housing is fixedly connected to a translation rack via a mounting plate. A turntable is rotatably installed at the center of the sample box. A clamping motor for driving the turntable to rotate is provided inside the sample box. A crank is eccentrically rotatably connected to the bottom end of the turntable. A sliding groove is formed along the radial direction of the turntable at the bottom end of the sample box. A slider is slidably installed in the sliding groove. The slider is hinged to the crank. A clamping block for clamping the sample is fixedly installed on the slider. A gravity sensor is provided at the center of the turntable.

[0009] The clamping block holds the sample against the side wall of the sample box. The turntable, crank, and slider form a crank-slider mechanism. The clamping motor drives the turntable to rotate, and the rotation of the turntable can drive the slider to move along the slide groove, thereby driving the clamping block to move radially along the turntable. This allows for adaptive adjustment according to the size of the sample and fixation of the sample.

[0010] Preferably, a rotating shaft is rotatably mounted at the bottom of the housing, and a cam is fixedly mounted on the rotating shaft. The top of the cam is in close contact with the bottom surface of the sample box and is used to drive the sample box to move up and down within the housing. A lifting motor for driving the rotating shaft is provided inside the housing.

[0011] The lifting motor drives the rotating shaft to rotate, which in turn causes the cam to rotate. The rotation of the cam changes the distance between the rotating shaft and the bottom surface of the sample box, thereby raising and lowering the sample box to adjust the cutting position of the sample and obtain a suitable upper surface size for testing.

[0012] Preferably, the cutting mechanism includes a cutting shaft vertically rotatably mounted on a worktable, a cutting blade fixedly mounted on the cutting shaft, the cutting blade being located above the translation mechanism, and a second bevel gear, which is connected to the power mechanism, fixedly mounted on the bottom end of the cutting shaft. The second bevel gear meshes with a fourth bevel gear. The fourth bevel gear drives the second bevel gear to rotate, causing the cutting shaft and the cutting blade to rotate, and the rotating cutting blade cuts the sample.

[0013] Preferably, the elemental analysis device includes a vision sensor and an infrared detection device fixedly installed at the bottom of the worktable. A universal joint is provided on the worktable, and the infrared detection device is fixedly installed at the bottom of the universal joint. The infrared detection device emits infrared light onto the sample surface through an infrared emitter and receives the reflected light through an infrared reflector. The emitted light is analyzed and detected to obtain the elemental analysis results of the sample.

[0014] The stone sample is photographed vertically downwards using a high-resolution vision sensor to obtain an image of its upper surface. The sample box features a dark design to serve as a background, enhancing the contrast between the stone sample surface and the background for easier identification.

[0015] The infrared detection device uses the NIR-M-R2 reflective module, which has a wavelength range of 900-1700nm, a built-in light source, and supports USB, UART, and Bluetooth communication, allowing it to connect to a mobile phone for integrated development. This module can obtain some compositional information about the material surface through the analysis of reflected light, and the motion accuracy of the gimbal must meet the marking accuracy requirements.

[0016] Preferably, the universal device includes a housing fixedly mounted on a workbench, a universal joint is provided inside the housing, and a universal motor is provided on the universal joint to actively drive the two universal joint frames to move independently.

[0017] Each universal joint frame is a U-shaped structure with a rotation axis. During operation, the rotation axis of the universal joint frame coincides with the rotation axis of the cross shaft. The universal joint frame has a reserved space that extends in the axial and radial directions of the rotation axis to accommodate the cross shaft and avoid interference when the universal joint frame rotates.

[0018] When the universal motor is working, the output end of the universal motor drives the universal joint frame to rotate around the rotation axis of the universal joint frame, thereby achieving the purpose of providing the universal joint with a set angle of steering. The position of the infrared detection device at the bottom of the universal joint changes with the change of the universal joint angle.

[0019] The workbench is equipped with an opening and closing mechanism for closing or opening the bottom of the box, and an opening and closing motor for driving the opening and closing mechanism is fixedly installed on the workbench.

[0020] During cutting, the opening and closing mechanism closes the bottom of the box to prevent dust generated during cutting from contaminating the infrared detection device and affecting detection. After cutting is completed, the opening and closing mechanism opens, and the angle of the infrared detection device is adjusted via a universal joint to perform multi-point detection, improving the accuracy of the detection results.

[0021] Preferably, the power mechanism includes a drive shaft vertically fixedly mounted on the base, a third bevel gear fixedly mounted on the drive shaft, and a fourth bevel gear rotatably mounted on the base via a second mounting seat. The third bevel gear meshes with the fourth bevel gear. The third bevel gear is used to drive the translation mechanism, and the fourth bevel gear is used to drive the cutting mechanism. The drive shaft is connected to a drive motor.

[0022] The active motor drives the third bevel gear to rotate, which in turn drives the fourth bevel gear and the first bevel gear of the translation mechanism to rotate. The fourth bevel gear drives the second bevel gear of the cutting mechanism to rotate, enabling the translation mechanism and the cutting mechanism to start and stop synchronously. The translation mechanism moves the stone sample, while the cutting mechanism cuts the moving stone sample.

[0023] Preferably, a dust extraction fan is provided on the workbench above the cutting mechanism. The dust extraction fan is used to absorb the dust generated by the cutting mechanism when cutting the sample into the dust collection box, thereby reducing the impact of dust on the detection.

[0024] Preferably, the base and the workbench are provided with an outer shell, the outer shell is provided with a handle for easy carrying, and the bottom of the base is provided with four elastic buffer feet to reduce shock and noise.

[0025] Preferably, the drive motor and clamping motor are stepper motors, the drive motor is an EDSMT-2T110-060C type motor, and the lifting motor and universal motor are servo motors.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. In this invention, a power mechanism is provided on the base, which drives the translation mechanism and the cutting mechanism to operate synchronously. The translation mechanism transports the stone sample along the tangential direction of the cutting blade. The cutting blade cuts the sample, making the upper surface of the sample flat. An elemental analysis device is provided on the worktable. The visual sensor of the elemental analysis device identifies the upper surface of the stone sample, and then the infrared detection device performs infrared detection on the upper surface of the stone sample to analyze and obtain the elemental content of the stone sample.

[0028] 2. The infrared detection device in this invention is installed at the bottom of the universal joint. The universal joint is driven by the universal motor, and the angle of the universal joint can be remotely adjusted, thereby realizing the position control of the infrared detection device. It can perform elemental analysis on multiple points on the surface of the stone sample, thereby improving the accuracy of the detection results.

[0029] 3. This invention incorporates a cam within the sample storage mechanism. The cam drives the sample box to rise and fall, moving the stone sample to a suitable height. This ensures that the stone sample can be cut to obtain a suitable flat surface for elemental analysis. A crank-slider mechanism is also included to move the clamping block, holding the stone sample between the clamping block and the inner wall of the sample box. The inner side of the clamping block is arc-shaped, ensuring stable clamping of the stone sample and facilitating cutting. The invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0032] Figure 3 This is a schematic diagram of the base structure in this invention.

[0033] Figure 4 This is a schematic diagram of the sample storage mechanism in this invention.

[0034] Figure 5 This is a schematic diagram of the sample box structure in this invention.

[0035] Figure 6 This is a schematic diagram of the mounting position of the cam in this invention.

[0036] Figure 7 This is a schematic diagram of the workbench structure in this invention.

[0037] Figure 8 This is a schematic diagram of the opening and closing mechanism in this invention.

[0038] Figure 9 This is a schematic diagram of the universal joint device in this invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0043] like Figures 1-9 As shown, the present invention provides a portable geochemical element analyzer, including a base 1 and a worktable 2. The base 1 is provided with a translation mechanism 3, and the translation mechanism 3 is provided with a sample storage mechanism 4 for storing samples. The bottom end of the worktable 2 is provided with a cutting mechanism 5 for cutting samples to make the upper surface of the samples flat. The worktable 2 is provided with an element analysis device 6. A dustproof plate is provided between the cutting mechanism 5 and the element analysis device 6 on the worktable 2. The base 1 is also provided with a power mechanism 7 for driving the translation mechanism 3 and the cutting mechanism 5.

[0044] In this embodiment, the translation mechanism 3 includes three equally spaced first mounting seats 301. A first mounting shaft 302 is rotatably mounted on the side of each first mounting seat 301. A first gear 303 is fixedly mounted on the first mounting shaft 302. A translation rack 304 meshes with the first gear 303 on each of the three first gears 303. The transmission ratio between the translation rack 304 and the first gear 303 is 1:110. The sample storage mechanism 4 is fixedly mounted on the translation rack 304. A first bevel gear 305, which is connected to the power mechanism 7, is also fixedly mounted on the first mounting shaft 302 in the middle. The first bevel gear 305 meshes with the third bevel gear 702.

[0045] The third bevel gear 702 drives the first bevel gear 305 to rotate, causing the first mounting shaft 302 and the first gear 303 located in the middle to rotate. This, in turn, drives the translation rack 304 to move laterally, and simultaneously drives the other two first gears 303 to rotate. The two first gears 303 located on the outer sides support the translation rack 304. The movement of the translation rack 304 causes the sample storage mechanism 4 on the translation rack 304 to move, so that the sample in the sample box 402 is cut by the cutting mechanism 5 as it moves. After cutting, the upper surface of the sample is a smooth plane for testing.

[0046] In this embodiment, the sample storage mechanism 4 includes a housing 401 and a sample box 402 vertically slidably installed inside the housing 401. The bottom end of the housing 401 is fixedly connected to a translation rack 304 via a mounting plate. A turntable 4021 is rotatably installed at the center of the sample box 402. A clamping motor for driving the turntable 4021 to rotate is provided inside the sample box 402. A crank 4022 is eccentrically rotatably connected to the bottom end of the turntable 4021. The bottom end of the sample box 402 is along the turntable 402. A radial groove 4023 is provided on the turntable 4021. A slider 4024 is slidably installed in the groove 4023. The slider 4024 is hinged to the crank 4022. A clamping block 4025 for clamping the sample is fixedly installed on the slider 4024. The side of the clamping block 4025 facing the turntable 4021 is set as an arc surface to facilitate clamping irregular stone samples. A gravity sensor 4026 is provided at the center of the turntable 4021 to monitor whether a stone sample is placed on the turntable 4021.

[0047] The clamping block 4025 clamps the sample against the side wall of the sample box 402. The turntable 4021, crank 4022, and slider 4024 form a crank-slider mechanism. The clamping motor drives the turntable 4021 to rotate. The rotation of the turntable 4021 can drive the slider 4024 to move along the slide groove 4023, thereby driving the clamping block 4025 to move radially along the turntable 4021. This allows for adaptive adjustment according to the size of the sample, and fixation of the sample.

[0048] In this embodiment, a rotating shaft 4011 is rotatably mounted on the bottom of the housing 401, and a cam 4012 is fixedly mounted on the rotating shaft 4011. The top of the cam 4012 is in close contact with the bottom surface of the sample box 402 and is used to drive the sample box 402 to move up and down within the housing 401. A lifting motor for driving the rotating shaft 401 is provided inside the housing 401.

[0049] The lifting motor drives the rotating shaft 4011 to rotate, which in turn causes the cam 4012 to rotate. The rotation of the cam 4012 causes the distance between the rotating shaft 4011 and the bottom surface of the sample box 402 to change, thereby realizing the lifting and lowering of the sample box 402 to adjust the cutting position of the sample and obtain an upper surface of appropriate size for testing.

[0050] In this embodiment, the cutting mechanism 5 includes a cutting shaft 501 vertically rotatably mounted on the worktable 2. A cutting blade 502 is fixedly mounted on the cutting shaft 501, and the cutting blade 502 is located above the translation mechanism 3. A second bevel gear 503, which is connected to the power mechanism 7, is also fixedly mounted on the bottom end of the cutting shaft 501. The second bevel gear 503 meshes with a fourth bevel gear 704. The fourth bevel gear 704 drives the second bevel gear 503 to rotate, causing the cutting shaft 501 and the cutting blade 502 to rotate, and the rotating cutting blade 502 cuts the sample.

[0051] In this embodiment, the elemental analysis device 6 includes a vision sensor 601 and an infrared detection device 602 fixedly installed at the bottom of the workbench 2. A universal joint 603 is provided on the workbench 2, and the infrared detection device 602 is fixedly installed at the bottom of the universal joint 603. The infrared detection device 602 emits infrared light to the sample surface through an infrared emitter and receives the reflected light through an infrared reflector. The emitted light is analyzed and detected to obtain the sample elemental analysis results.

[0052] The stone sample is imaged vertically downwards using a high-resolution vision sensor 601, resulting in an image of the upper surface of the sample. The sample holder features a dark design to serve as a background, enhancing the contrast between the stone sample surface and the background for easier identification.

[0053] The infrared detection device 602 uses the NIR-M-R2 reflective module, which has a wavelength range of 900-1700nm, a built-in light source, and supports USB, UART, and Bluetooth communication. It can be connected to a mobile phone for integrated development. This module can obtain some compositional information of the material surface through the analysis of reflected light, and the motion accuracy of the omnidirectional device must meet the marking accuracy requirements.

[0054] In this embodiment, the universal device 603 includes a box 6031 fixedly installed on the workbench 2, a universal joint 6032 is provided in the box, and a universal motor 6033 is provided on the universal joint 6032, which can actively drive the two universal joint frames to move independently.

[0055] Each universal joint frame is a U-shaped structure with a rotation axis. During operation, the rotation axis of the universal joint frame coincides with the rotation axis of the cross shaft. The universal joint frame has a reserved space that extends in the axial and radial directions of the rotation axis to accommodate the cross shaft and avoid interference when the universal joint frame rotates.

[0056] When the universal motor 6033 is working, the output end of the universal motor 6033 drives the universal joint frame to rotate around the rotation axis of the universal joint frame, thereby achieving the purpose of providing a set angle of steering for the universal joint 6032. The position of the infrared detection device 602 at the bottom of the universal joint 6032 changes with the change of the angle of the universal joint 6032.

[0057] The workbench 2 is provided with an opening and closing mechanism 6034 for closing or opening the bottom of the box 6031, and an opening and closing motor 6035 for driving the opening and closing mechanism 6034 is fixedly installed on the workbench 2.

[0058] During cutting, the opening and closing mechanism 6034 closes the bottom of the box 6031 to prevent dust generated during cutting from contaminating the infrared detection device 602 and affecting detection. After cutting is completed, the opening and closing mechanism 6034 opens, and the angle of the infrared detection device 602 is adjusted through the universal joint 6032 to perform multi-point detection and improve the accuracy of the detection results.

[0059] In this embodiment, the power mechanism 7 includes a drive shaft 701 vertically fixedly mounted on the base 1, a third bevel gear 702 fixedly mounted on the drive shaft 701, and a fourth bevel gear 704 rotatably mounted on the base 1 via a second mounting seat 703. The third bevel gear 702 meshes with the fourth bevel gear 704. The third bevel gear 702 is used to drive the translation mechanism 3, and the fourth bevel gear 704 is used to drive the cutting mechanism 5. The drive shaft 701 is connected to a drive motor.

[0060] The active motor drives the third bevel gear 702 to rotate, which in turn drives the fourth bevel gear 704 and the first bevel gear 305 of the translation mechanism 3 to rotate. The fourth bevel gear 704 drives the second bevel gear 503 of the cutting mechanism 5 to rotate, so that the translation mechanism 3 and the cutting mechanism 5 can start and stop synchronously. The translation mechanism 3 moves the stone sample, while the cutting mechanism 5 cuts the moving stone sample.

[0061] In this embodiment, a dust extraction fan 201 is provided on the workbench 2 above the cutting mechanism 5. The dust extraction fan 201 is used to absorb the dust generated by the cutting mechanism 5 in cutting the sample into the dust collection box, thereby reducing the impact of dust on the detection.

[0062] In this embodiment, the base 1 and the workbench 2 are provided with an outer shell 8, and the outer shell 8 is provided with a handle for easy carrying. The base 1 is provided with four elastic buffer feet 101 at the bottom to reduce shock and noise.

[0063] In this embodiment, the active motor and clamping motor are stepper motors, and the lifting motor and universal motor 6033 are servo motors.

Claims

1. A portable geochemical element analyzer characterized by comprising: The utility model provides a sample element analysis device, including base (1) and work table (2), be provided with translation mechanism (3) on base (1), be provided with sample storage mechanism (4) for depositing sample on translation mechanism (3), be provided with cutting mechanism (5) for cutting sample to make sample upper surface be plane at work table (2) bottom, be provided with element analysis device (6) on work table (2), be provided with dust screen between cutting mechanism (5) and element analysis device (6) on work table (2), still be provided with power mechanism (7) for driving translation mechanism (3) and cutting mechanism (5) on base (1), The sample storage mechanism (4) includes a housing (401) and a sample box (402) vertically slidingly installed in the housing (401), a turntable (4021) is rotatably installed at the center of the sample box (402), a clamping motor is arranged in the sample box (402) for driving the turntable (4021) to rotate, a crank (4022) is eccentrically connected to the bottom end of the turntable (4021), a sliding slot (4023) is formed in the bottom end of the sample box (402) along the radial direction of the turntable (4021), a sliding block (4024) is slidingly installed in the sliding slot (4023), the sliding block (4024) is hingedly connected to the crank (4022), a clamping block (4025) for clamping the sample is fixedly installed on the sliding block (4024), and a gravity sensor (4026) is arranged at the center of the turntable (4021). A rotating shaft (4011) is rotatably installed at the bottom end of the housing (401), a cam (4012) is fixedly installed on the rotating shaft (4011), the top end of the cam (4012) abuts against the bottom surface of the sample box (402) to drive the sample box (402) to ascend and descend in the housing (401), and an ascending and descending motor is arranged in the housing (401) for driving the rotating shaft (4011). The element analysis device (6) includes a visual sensor (601) and an infrared detection device (602) fixedly installed at the bottom end of the work table (2), a universal device (603) is arranged on the work table (2), the infrared detection device (602) is fixedly installed at the bottom end of the universal device (603), the infrared detection device (602) emits infrared rays to the surface of the sample through an infrared ray emitter and receives reflected light through an infrared ray reflector, and the sample element analysis result is obtained by analyzing and detecting the emitted light.

2. The portable geochemical element analyzer according to claim 1, characterized in that, The translation mechanism (3) includes three first mounting seats (301) arranged at equal intervals, a first mounting shaft (302) is rotatably installed at the side end of each first mounting seat (301), a first gear (303) is fixedly installed on the first mounting shaft (302), a translation rack (304) engaged with the first gear (303) is arranged on the three first gears (303), the sample box (402) is fixedly installed on the translation rack (304), and a first bevel gear (305) in transmission connection with the power mechanism (7) is further fixedly installed on the middle first mounting shaft (302).

3. The portable geochemical element analyzer according to claim 1, characterized in that, The cutting mechanism (5) comprises a cutting shaft (501) vertically rotatably installed on the workbench (2), a cutting blade (502) is fixedly installed on the cutting shaft (501), the cutting blade (502) is located above the translation mechanism (3), and a second bevel gear (503) in transmission connection with the power mechanism (7) is further fixedly installed on the bottom end of the cutting shaft (501).

4. The portable geochemical element analyzer according to claim 1, characterized in that, The universal device (603) comprises a box body (6031) fixedly installed on the workbench (2), a universal joint (6032) is arranged in the box body, and a universal motor (6033) for driving two universal joint frames to independently move is arranged on the universal joint (6032). The workbench (2) is provided with an opening and closing mechanism (6034) for closing or opening the bottom end of the box body (6031), and the workbench (2) is fixedly installed with an opening and closing motor (6035) for driving the opening and closing mechanism (6034).

5. The portable geochemical element analyzer according to claim 1, wherein, The power mechanism (7) comprises a driving shaft (701) vertically fixedly installed on the base (1), a third bevel gear (702) is fixedly installed on the driving shaft (701), a fourth bevel gear (704) is rotatably installed on the base (1) through a second mounting seat (703), the third bevel gear (702) is in meshing connection with the fourth bevel gear (704), the third bevel gear (702) is used for driving the translation mechanism (3), the fourth bevel gear (704) is used for driving the cutting mechanism (5), and the driving shaft (701) is in transmission connection with a driving motor.

6. The portable geochemical element analyzer of claim 1, wherein, The workbench (2) is provided with a dust suction fan (201) above the cutting mechanism (5), and the dust suction fan (201) is used for sucking dust generated by the cutting mechanism (5) into a dust collecting box.

7. The portable geochemical element analyzer of claim 1, wherein, The base (1) and the workbench (2) are provided with an outer shell (8), the outer shell (8) is provided with a handle, and the bottom end of the base (1) is provided with four elastic buffer feet (101).

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