Intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution

Abstract

This invention discloses an intelligent integrated platform for in-situ remediation and real-time monitoring of polluted groundwater, comprising a reagent supply component, an injection component, and a monitoring component. The reagent supply component includes a reagent cylinder, a mixing component inside the reagent cylinder, and a mixing motor that provides power to the mixing component. The injection component includes a screen tube, a driving component inside the screen tube, an injection tube connected to the driving component, and a pneumatic diaphragm pump connected to the reagent cylinder and the injection tube respectively. The monitoring component includes a water quality analyzer, a collection box, and a sampling pump. This invention features a reasonable structural design, integrating groundwater remediation and real-time monitoring functions. By monitoring the remediation effect of polluted groundwater in real time, it facilitates real-time adjustment of the injection volume and type of remediation reagent based on the monitoring results, thereby improving the remediation effect of polluted groundwater, shortening the remediation cycle, and making it suitable for widespread application.

Description

Technical Field

[0001] This invention relates to the field of groundwater pollution remediation technology, specifically to an intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution. Background Technology

[0002] Groundwater refers to water in various states that is widely buried below the Earth's surface. Atmospheric precipitation is the main source of groundwater. Based on different underground burial conditions, groundwater can be divided into three main categories: perched water, unconfined water, and artesian water. According to burial conditions, it can be divided into vadose zone water, unconfined water, and confined water. According to the burial medium, it can be divided into pore water, fissure water, and karst water. Groundwater is an important component of water resources. Due to its stable quantity and good quality, it is one of the important water sources for agricultural irrigation, mining, and cities. Therefore, groundwater remediation and monitoring are particularly important.

[0003] Currently, in-situ remediation and monitoring of contaminated groundwater are carried out separately. The equipment coordination is poor, making it difficult to adjust the remediation measures and affecting the efficiency of groundwater remediation. Moreover, it is easy to cause over-remediation, wasting human and material resources. At the same time, when existing equipment is used to remediate contaminated groundwater, since there may be multiple groundwater layers and the remediation pipeline can only remediate contaminated groundwater at the same depth, multiple remediation pipelines need to be laid in the ground when multiple groundwater layers need to be remediated. This not only increases the difficulty of remediation of contaminated groundwater, but also wastes resources. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution.

[0005] The technical solution of the present invention is as follows: The intelligent integrated in-situ remediation and real-time monitoring platform for groundwater pollution includes a reagent supply component, an injection component connected to the reagent supply component, and a monitoring component connected to the injection component.

[0006] The reagent supply assembly includes a reagent cylinder, a mixing component disposed inside the reagent cylinder, and a mixing motor disposed at the top of the reagent cylinder and providing power to the mixing component; the mixing component includes a rotating shaft that is rotatably engaged inside the reagent cylinder and extends through the reagent cylinder at its top, two mounting discs respectively sleeved on the rotating shaft, and several mixing mesh plates equidistantly distributed between the two mounting discs; the mixing motor provides power to the rotating shaft;

[0007] The injection assembly includes a sieve tube, a drive component disposed inside the sieve tube, an injection tube connected to the drive component, and a pneumatic diaphragm pump connected to the drug cartridge and the injection tube respectively; the sieve tube is rotatably engaged with a connecting seat; the drive component includes a hollow tube rotatably engaged inside the sieve tube, a drive disc sleeved on the hollow tube, and a drive motor that provides power to the hollow tube; the injection tube is slidably engaged with the connecting seat, and the injection tube is rotatably engaged with the drive disc through a movable head;

[0008] The monitoring components include a water quality analyzer, a collection box located at the bottom of the screen tube, and a sampling pump located on the screen tube.

[0009] Furthermore, each mixing mesh plate has its two ends slidably engaged with two mounting discs; the rotating shaft is hollow inside, and an adjusting screw is rotatably engaged inside the rotating shaft; a sliding sleeve is slidably engaged outside the rotating shaft on the side opposite to the two mounting discs; a threaded block is provided on the sliding sleeve, passing through the rotating shaft and threadedly connected to the adjusting screw; a pressure plate is fitted outside the sliding sleeve, and several push arms are movably connected to the ends of each mixing mesh plate; the threads of the threaded blocks on the two sliding sleeves have opposite directions; a limiting plate is provided at the top of the reagent cylinder, which is fixedly connected to the adjusting screw;

[0010] Explanation: By controlling the mixing motor to rotate forward and backward, since the adjusting screw is in a relatively stationary state, when the mixing motor drives the rotating shaft to rotate, the sliding sleeve, under the connection between the threaded block and the adjusting screw, drives the pressure plate to move up and down along the rotating shaft. During the movement of the two pressure plates, the corresponding push arm pushes the mixing mesh plate to move on the mounting plate, thereby changing the mixing path of the mixing mesh plate for the repair agent, which is beneficial to improving the mixing uniformity of the repair agent and enhancing the effect of the repair agent.

[0011] Furthermore, each of the hybrid mesh panels is equipped with an ultrasonic probe on its sidewall; and an ultrasonic generator electrically connected to each ultrasonic probe is installed on the ground.

[0012] Note: The use of an ultrasonic probe helps to ensure the complete dissolution and mixing of the repair agent.

[0013] Furthermore, a drilling tip is provided at the end of the injection tube away from the movable head, an external thread is provided on the outer wall of the injection tube, and an internal thread is provided on the connecting seat to connect with the external thread.

[0014] Explanation: When the injection tube enters the soil through the connecting seat under the action of the drill tip, the threaded connection between the injection tube and the connecting seat causes the injection tube to rotate, reducing the resistance of the soil to the injection tube and allowing the injection tube to enter the soil smoothly.

[0015] Furthermore, the injection tube is hollow inside, and an inner core that can penetrate the drill tip is slidably engaged inside the injection tube; a return spring that engages with the inner wall of the injection tube is sleeved at the end of the inner core; the inner core is connected to the pneumatic diaphragm pump through a hose; a push rod that abuts against the inner core is slidably engaged at the end of the injection tube, and the push rod is rotatably engaged with the movable head through a rotary joint.

[0016] Note: When the injection tube enters the designated position in the soil, the drive disc continues to push the movable head. At this time, the push rod pushes the inner core to move inside the injection tube, and finally the inner core extends out from the end of the drill tip, injecting the remediation agent into the soil. This avoids soil particles clogging the injection tube during the process of entering the soil, thus improving the reliability of the platform.

[0017] Furthermore, a sealing sleeve is slidably snapped onto the outside of the screen tube, and a through groove is provided on the sealing sleeve that can communicate with the through hole. A pull rod connected to the sealing sleeve is provided inside the screen tube, and a pneumatic pull rod connected to the pull rod is provided at the top of the screen tube through a carrier frame.

[0018] Instructions: When the screen tube enters the pre-excavated underground well, the through hole on the screen tube is sealed with a sealing sleeve to prevent soil from entering the screen tube and causing equipment failure. When the screen tube reaches the preset position, the sealing sleeve is moved outside the screen tube by a pneumatic pull rod, so that the through groove and the through hole are connected to each other.

[0019] Furthermore, it also includes an equipment box installed on the ground; the ultrasonic generator, pneumatic diaphragm pump, and water quality analyzer are all installed inside the equipment box;

[0020] Note: By setting up equipment boxes, it is easy to store and protect various electrical components, and at the same time, the integration of the platform is improved.

[0021] Furthermore, a derrick platform that is fixedly connected to the ground is fitted around the screen pipe;

[0022] Note: By setting up a derrick platform, the stability of the screen pipe is improved, ensuring the reliability of the invention.

[0023] The method of using this invention includes the following steps:

[0024] S1. The repair agent is added into the agent cylinder through the injection tube, and then the rotating shaft is driven by the mixing motor to rotate. The repair agent is mixed and stirred by the mixing screen plate. The repair agent is prepared by mixing FeSO4, Na2S and pure water in a volume ratio of 1:1:50.

[0025] S2. Place the screen tube in the pre-excavated underground well, use the drive motor to drive the hollow tube and drive disc to rotate, and each injection tube slides along the corresponding connecting seat under the action of the drive disc and is inserted into the soil through the through hole on the screen tube.

[0026] S3. Using a pneumatic diaphragm pump, the remediation agent inside the agent cylinder is injected into the soil through an injection tube to remediate and treat contaminated groundwater.

[0027] S4. Pore water in the soil enters the bottom of the sieve tube through the sampling slot on the sieve tube and is collected through the collection box; the water sample inside the collection box is pumped into the water quality analyzer for testing, and the remediation effect of polluted groundwater is monitored in real time.

[0028] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0029] First, the present invention has a reasonable structural design, integrating groundwater remediation and real-time monitoring functions. By monitoring the remediation effect of polluted groundwater in real time, it is convenient to adjust the injection volume and type of remediation agent in real time according to the monitoring results, thereby improving the remediation effect of polluted groundwater and shortening the remediation cycle of polluted groundwater.

[0030] Secondly, the injection component of the present invention can inject remediation agents into soil at different depths in the same remediation area, thereby increasing the injection range of the remediation agent and enabling the remediation agent to fully contact the contaminated groundwater, thus improving the effectiveness of the remediation agent. At the same time, the injection component of the present invention has an anti-clogging effect, further improving the reliability of the present invention.

[0031] Third, the mixing component of the present invention is used to stir and mix the repair agent. By adjusting the rotation path of the mixing mesh plate, the repair agent is mixed more evenly, avoiding the agent from depositing inside the agent cylinder and affecting its effect. Moreover, with the assistance of the ultrasonic generator, the repair agent can be better dissolved in pure water. Attached Figure Description

[0032] Figure 1 This is a longitudinal sectional view of the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of the pharmaceutical cartridge of the present invention;

[0034] Figure 3 This is a schematic diagram of the connection between the push arm and the pressure plate of the present invention;

[0035] Figure 4 This is a schematic diagram of the connection between the sliding sleeve and the rotating shaft of the present invention;

[0036] Figure 5 This is a schematic diagram of the connection between the drive motor and the hollow tube of the present invention;

[0037] Figure 6 This is a schematic diagram of the connection between the injection tube and the drive disk of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the injection tube of the present invention;

[0039] Figure 8 This is a schematic diagram of the connection between the sealing sleeve and the screen tube of the present invention;

[0040] Among them, 1-Drug supply component, 10-Drug cylinder, 100-Injection tube, 11-Mixing component, 110-Rotating shaft, 111-Mounting plate, 112-Mixing mesh plate, 1120-Slide seat, 113-Connecting pulley, 12-Mixing motor, 120-Main pulley, 13-Adjusting screw, 130-Limiting plate, 14-Sliding sleeve, 140-Threaded block, 141-Pressure plate, 15-Push arm, 16-Ultrasonic generator, 160-Ultrasonic probe, 2-Injection component, 20-Sieve tube, 200-Through hole, 201-Sample inlet, 21-Drive component, 210-Support, 211-Hollow 2110-Gear ring, 212-Drive disc, 213-Drive motor, 2130-Drive gear, 22-Injection tube, 220-Moving head, 221-Drill tip, 2210-Cleaning sleeve, 222-External thread, 23-Pneumatic diaphragm pump, 24-Connecting seat, 25-Inner core, 250-Reset spring, 251-Top rod, 252-Rotating joint, 26-Sealing sleeve, 260-Through groove, 261-Tie rod, 262-Carrier frame, 263-Pneumatic tie rod, 27-Derrick platform, 3-Monitoring components, 30-Water quality analyzer, 31-Collection box, 32-Sampling pump, 4-Equipment box. Detailed Implementation

[0041] Example 1

[0042] like Figure 1 The intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution shown includes a reagent supply component 1, an injection component 2 connected to the reagent supply component 1, and a monitoring component 3 connected to the injection component 2.

[0043] like Figure 1 , 2 As shown, the medicine supply assembly 1 includes a medicine cylinder 10, a mixing component 11 disposed inside the medicine cylinder 10, and a mixing motor 12 disposed at the top of the medicine cylinder 10 and providing power to the mixing component 11; a medicine injection tube 100 is disposed at the top of the medicine cylinder 10; the mixing component 11 includes a rotating shaft 110 rotatably engaged inside the medicine cylinder 10 and having its top end penetrating through the medicine cylinder 10, two mounting discs 111 respectively sleeved on the rotating shaft 110, and four mixing mesh plates 112 equidistantly distributed between the two mounting discs 111; a connecting pulley 113 is sleeved at the top of the rotating shaft 110; a main pulley 120 is disposed on the output shaft of the mixing motor 12, and the main pulley 120 and the connecting pulley 113 are driven by a belt.

[0044] like Figure 1 , 5 As shown in Figure 6, the injection assembly 2 includes a sieve tube 20, a drive component 21 disposed inside the sieve tube 20, an injection tube 22 connected to the drive component 21, and a pneumatic diaphragm pump 23 whose input end is connected to the drug cartridge 10 and whose output end is connected to the injection tube 22; the lower end of the side wall of the sieve tube 20 has four through holes 200 distributed circumferentially, and each through hole 200 has a connecting seat 24 rotatably engaged inside; the drive component 21 includes a hollow tube 211 rotatably engaged inside the sieve tube 20, and a connector 24 sleeved on the hollow tube 211. The drive disc 212 on 11 and the drive motor 213 that provides power to the hollow tube 211; four injection tubes 22 are provided, each injection tube 22 is slidably engaged with each connecting seat 24, and each injection tube 22 is rotatably engaged with the drive disc 212 through the movable head 220; a gear ring 2110 is sleeved on the top of the hollow tube 211, the output shaft of the drive motor 213 passes through the screen tube 20, and a drive gear 2130 meshing with the gear ring 2110 is provided on the output shaft;

[0045] like Figure 1 , 5 As shown in Figure 8, the monitoring component 3 includes a water quality analyzer 30, a collection box 31 located at the bottom of the screen tube 20, and a sampling pump 32 located inside the screen tube 20 and connected to the collection box 31 via a flexible tube; a sample inlet 201 is provided at the lower end of the side wall of the screen tube 20.

[0046] Example 2

[0047] The difference between this embodiment and Embodiment 1 is that:

[0048] like Figure 2 , 3 As shown in Figure 4, each mixing mesh plate 112 has two ends slidably engaged with two mounting discs 111 respectively; the rotating shaft 110 is hollow inside, and an adjusting screw 13 is rotatably engaged inside the rotating shaft 110; a sliding sleeve 14 is slidably engaged outside the rotating shaft 110 on the side of the two mounting discs 111 that is far apart from each other; a threaded block 140 is provided on the sliding sleeve 14 that passes through the rotating shaft 110 and is threadedly connected to the adjusting screw 13; a pressure plate 141 is sleeved outside the sliding sleeve 14; several push arms 15 are movably connected to the ends of each mixing mesh plate 112 respectively; both ends of the mixing mesh plate 112 are provided with sliding seats 1120 that are slidably engaged with the mounting discs 111 at the corresponding positions; the threads of the threaded blocks 140 on the two sliding sleeves 14 have opposite directions; a limiting plate 130 is provided at the top of the reagent cylinder 10 that is fixedly connected to the adjusting screw 13;

[0049] By controlling the mixing motor 12 to rotate in both directions, and since the adjusting screw 13 is in a relatively stationary state, when the mixing motor 12 drives the rotating shaft 110 to rotate, the sliding sleeve 14, under the connection between the threaded block 140 and the adjusting screw 13, drives the pressure plate 141 to move up and down along the rotating shaft 110. During the movement of the two pressure plates 141, the corresponding pushing arm 15 pushes the mixing mesh plate 112 to move on the mounting plate 111, thereby changing the mixing path of the mixing mesh plate 112 for the repair agent, which is beneficial to improving the mixing uniformity of the repair agent and improving the effect of the repair agent.

[0050] Example 3

[0051] The difference between this embodiment and Embodiment 2 is that:

[0052] like Figure 1 , 2 As shown, each of the hybrid mesh plates 112 is equipped with an ultrasonic probe 160 on its sidewall; an ultrasonic generator 16, which is electrically connected to each ultrasonic probe 160, is installed on the ground.

[0053] With the assistance of the ultrasonic probe 160, the repair agent can be fully dissolved and mixed.

[0054] Example 4

[0055] The difference between this embodiment and Embodiment 3 is that:

[0056] like Figure 7 As shown, the injection tube 22 has a drilling tip 221 at the end away from the movable head 220. The outer wall of the injection tube 22 has an external thread 222, and the connecting seat 24 has an internal thread that connects to the external thread 222. The injection tube 22 is hollow inside, and an inner core 25 that can penetrate the drilling tip 221 is slidably engaged inside the injection tube 22. A return spring 250 that engages with the inner wall of the injection tube 22 is sleeved at the end of the inner core 25. The inner core 25 is connected to the pneumatic diaphragm pump 23 via a hose. A push rod 251 that abuts against the inner core 25 is slidably engaged at the end of the injection tube 22. The push rod 251 is rotatably engaged with the movable head 220 via a rotary joint 252. A cleaning sleeve 2210 that abuts against the inner core 25 is provided inside the drilling tip 221.

[0057] When the injection tube 22 enters the soil through the connecting seat 24 under the action of the drilling tip 221, the threaded connection between the injection tube 22 and the connecting seat 24 causes the injection tube 22 to rotate, reducing the resistance of the soil to the injection tube 22 and allowing the injection tube 22 to enter the soil smoothly. When the injection tube 22 enters the designated position in the soil, the drive disc 212 continues to push the moving head 220. At this time, the push rod 251 pushes the inner core 25 to move inside the injection tube 22, and finally causes the inner core 25 to extend from the end of the drilling tip 221, injecting the repair agent into the soil. This avoids soil particles clogging the injection tube 22 during the process of the injection tube 22 entering the soil, improving the reliability of the platform. When the inner core 25 retracts into the injection tube 22 under the action of the return spring 250, the cleaning sleeve 2210 can clean the contaminants on the surface of the inner core 25 and block the cleaned contaminants outside the injection tube 22.

[0058] Example 5

[0059] The difference between this embodiment and embodiment 4 is that:

[0060] like Figure 5 , 8 As shown, a sealing sleeve 26 is slidably snapped onto the outside of the screen tube 20. A through groove 260 that can communicate with the through hole 200 is provided on the sealing sleeve 26. A pull rod 261 connected to the sealing sleeve 26 is provided inside the screen tube 20. A pneumatic pull rod 263 connected to the pull rod 261 is provided at the top of the screen tube 20 via a carrier 262.

[0061] When the screen tube 20 enters the pre-excavated underground well, the sealing sleeve 26 is used to seal the through hole 200 on the screen tube 20 to prevent soil from entering the screen tube 20 and causing equipment failure. When the screen tube 20 reaches the preset position, the pneumatic pull rod 263 is used to pull the sealing sleeve 26 to move outside the screen tube 20 and make the through groove 260 and the through hole 200 communicate with each other.

[0062] Example 6

[0063] The difference between this embodiment and embodiment 5 is that:

[0064] like Figure 1 It also includes an equipment box 4 set on the ground; the ultrasonic generator 16, the pneumatic diaphragm pump 23 and the water quality analyzer 30 are all set inside the equipment box 4; the screen pipe 20 is fitted with a derrick platform 27 that is fixedly connected to the ground.

[0065] By setting up the equipment box 4, it is convenient to store and protect the electrical components, and at the same time, the integration of the platform is improved; by setting up the derrick platform 27, the stability of the screen pipe 20 is improved, ensuring the reliability of the invention.

[0066] Example 7

[0067] The difference between this embodiment and embodiment 6 is that:

[0068] like Figure 1 As shown, there are 3 drive disks 212 and 3 sets of injection tubes 22. Each injection tube 22 in each set is respectively set on each drive disk 212.

[0069] By setting up multiple sets of injection tubes 22, it is beneficial to increase the injection range of the remediation agent, thereby improving the remediation efficiency of contaminated groundwater.

[0070] It should be noted that the hybrid motor 12, ultrasonic generator 16, drive motor 213, pneumatic diaphragm pump 23, water quality analyzer 30 and sampling pump 32 used in this invention all adopt existing technologies and are not specifically limited here. Appropriate products can be selected according to actual needs.

Claims

1. An intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution, characterized in that: It includes a drug supply component (1), an injection component (2) connected to the drug supply component (1), and a monitoring component (3) connected to the injection component (2). The drug supply assembly (1) includes a drug cylinder (10), a mixing component (11) disposed inside the drug cylinder (10), and a mixing motor (12) disposed at the top of the drug cylinder (10) and providing power to the mixing component (11); the mixing component (11) includes a rotating shaft (110) rotatably engaged inside the drug cylinder (10) and having its top end penetrating through the drug cylinder (10), two mounting discs (111) respectively sleeved on the rotating shaft (110), and several mixing mesh plates (112) equidistantly distributed between the two mounting discs (111); the mixing motor (12) provides power to the rotating shaft (110); The injection assembly (2) includes a sieve tube (20), a drive component (21) disposed inside the sieve tube (20), an injection tube (22) connected to the drive component (21), and a pneumatic diaphragm pump (23) connected to the drug cartridge (10) and the injection tube (22) respectively; the lower end of the side wall of the sieve tube (20) has through holes (200) distributed circumferentially, and each through hole (200) is rotatably engaged with a connecting seat (24); the drive component (21) includes a hollow tube (211) rotatably engaged inside the sieve tube (20), a drive disc (212) sleeved on the hollow tube (211), and a drive motor (213) that provides power to the hollow tube (211); the injection tube (22) is slidably engaged with the connecting seat (24), and the injection tube (22) is rotatably engaged with the drive disc (212) through a movable head (220); The monitoring component (3) includes a water quality analyzer (30), a collection box (31) located at the bottom of the screen tube (20), and a sampling pump (32) located on the screen tube (20). Each of the mixing mesh plates (112) has its two ends slidably engaged with two mounting discs (111); the rotating shaft (110) is hollow inside, and an adjusting screw (13) is rotatably engaged inside the rotating shaft (110); a sliding sleeve (14) is slidably engaged outside the rotating shaft (110) on the side away from the two mounting discs (111); a threaded block (140) is provided on the sliding sleeve (14) that passes through the rotating shaft (110) and is threadedly connected to the adjusting screw (13); a pressure plate (141) is sleeved outside the sliding sleeve (14); several push arms (15) are movably connected to the ends of each mixing mesh plate (112) on the pressure plate (141); the threads of the threaded blocks (140) on the two sliding sleeves (14) have opposite directions; a limiting plate (130) is provided at the top of the medicine cylinder (10) that is fixedly connected to the adjusting screw (13). The injection tube (22) is provided with a drilling tip (221) at one end away from the movable head (220), and an external thread (222) is provided on the outer wall of the injection tube (22). The connecting seat (24) is provided with an internal thread that is threadedly connected to the external thread (222). The injection tube (22) is hollow inside, and an inner core (25) that can penetrate the drilling tip (221) is slidably engaged inside the injection tube (22); a return spring (250) that engages with the inner wall of the injection tube (22) is sleeved at the end of the inner core (25); the inner core (25) is connected to the pneumatic diaphragm pump (23) through a hose; a push rod (251) that abuts against the inner core (25) is slidably engaged at the end of the injection tube (22), and the push rod (251) is rotatably engaged with the movable head (220) through a rotating joint (252); The screen tube (20) is slidably snapped with a sealing sleeve (26) on the outside. The sealing sleeve (26) is provided with a through groove (260) that can communicate with the through hole (200). The screen tube (20) is provided with a pull rod (261) connected to the sealing sleeve (26) inside. The top of the screen tube (20) is provided with a pneumatic pull rod (263) connected to the pull rod (261) through a carrier frame (262).

2. The intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution according to claim 1, characterized in that, An ultrasonic probe (160) is provided on the side wall of each of the hybrid mesh plates (112); an ultrasonic generator (16) electrically connected to each of the ultrasonic probes (160) is provided on the ground.

3. The intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution according to claim 2, characterized in that, It also includes an equipment box (4) set on the ground; the ultrasonic generator (16), the pneumatic diaphragm pump (23) and the water quality tester (30) are all set inside the equipment box (4).

4. The intelligent integrated platform for in-situ remediation and real-time monitoring of groundwater pollution according to claim 1, characterized in that, The screen pipe (20) is fitted with a derrick platform (27) that is fixedly connected to the ground.

Images