Wellhead temporary protection device capable of preventing falling danger

Abstract

The invention discloses a wellhead temporary protection device capable of preventing falling danger, which comprises a cover plate base arranged in a wellhead, a wellhead cover plate, a fan-shaped protection wing plate, an opening and closing end protection assembly, a linkage power receiving assembly and a telescopic support rod, wherein one end of the wellhead cover plate is hinged with one side in the cover plate base, and the other end of the wellhead cover plate is lapped with the other side in the cover plate base to form an opening and closing end; and an electromagnet, an alarm and a power supply. The problems that a temporary protective cover plate of a well mouth does not cover in place, constructors are prone to missing steps and fall off, and when the constructors go out of or go into the well, materials stacked beside the well are prone to falling off and injure the constructors are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering safety, and in particular relates to a temporary wellhead protection device capable of preventing the danger of falling. Background Art

[0002] Common temporary protection for wellheads used at construction sites include wooden formwork, steel plates, steel grille covers, etc. Under normal use, accidents of people falling from heights can be effectively avoided. However, in actual production, there are often problems with the cover not being covered, not covered tightly, or lost. Analysis shows that the main reasons for this situation are the following two points: 1. The operators have a weak sense of safety and move the wellhead protection cover at will or use the cover for other purposes. 2. The well workers fail to restore the wellhead cover protection in time after going down the well; or the wellhead cover is not covered properly or forgotten after going down the well. In addition, in engineering practice, the applicant found that in construction sites with complex construction environments, construction materials may be temporarily piled up near the wellhead or on the wellhead cover. When the construction workers open the wellhead cover to go out of the well or enter the well, there is a risk of falling and injuring people. Especially when going out of the well, because the environment outside the wellhead cannot be observed in the wellhead, it is more likely to cause the risk of falling objects injuring people. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a temporary wellhead protection device that can prevent the risk of falling, so as to solve the problem that the temporary protection cover of the wellhead is not covered in place, the construction workers are prone to step on air and fall, and the materials piled near the well are prone to fall and injure the construction workers when they are leaving or entering the well.

[0004] The present invention is achieved through the following technical solutions.

[0005] A temporary wellhead protection device capable of preventing the danger of falling comprises a power source, a cover base arranged in the wellhead, a wellhead cover having one end hinged to one side of the inside of the cover base and the other end overlapped to the other side of the inside of the cover base to form an open and closed end, characterized in that it also comprises:

[0006] A fan-shaped protective wing plate, wherein the fan-shaped protective wing plate is vertically connected to the edges of both sides of the wellhead cover plate and the center of the circle coincides with the hinged rotation axis of the wellhead cover plate, and an end rod guide groove is arranged along the arc line of the circular arc frame of the fan-shaped protective wing plate;

[0007] The opening and closing end protection assembly includes a spring drum arranged in the cover base near the opening and closing end and capable of rolling up the flexible protection net downward, an end rod having two ends slidably connected to the end rod guide groove and having magnetism, and a flexible protection net having one end wound around the spring drum and the other end fixedly connected to the lower edge of the end rod;

[0008] A telescopic support rod, the telescopic support rod is arranged on both sides of the wellhead cover plate, the telescopic support rod comprises a lower support rod hingedly connected to the inside of the cover plate base at one end, an upper support rod slidably connected to the lower support rod at one end and hingedly connected to the bottom edge of the wellhead cover plate at the other end;

[0009] An electromagnet, which is disposed at the lower edge of the opening and closing end of the wellhead cover plate and is electrically connected to the first contact rod to magnetically cooperate with the end rod;

[0010] an alarm, the alarm being arranged at a side of the cover base away from the engagement end and being electrically connected to the second contact rod; and,

[0011] A linkage power receiving component, wherein the linkage power receiving component is arranged on the telescopic support rod on either side, and the linkage power receiving component includes an insulated relay rod, a first contact rod and a second contact rod that are conductive and arranged along the sliding direction of the upper support rod, and an insulated power receiving plate fixedly arranged on the lower support rod; one end of the first contact rod is insulated and fixedly connected to the upper support rod, and the other end is vertically fixedly connected to one end of the relay rod; one end of the second contact rod is insulated and slidably connected to the lower support rod, and the other end is vertically fixedly connected to the other end of the relay rod; the wellhead cover plate drives the telescopic support rod to extend and retract during the opening and closing process. The electric plate is contracted so that the power receiving plate is in sliding contact with the first contact rod or the second contact rod; when the wellhead cover is in a closed state and the opening angle is less than or equal to the safety angle, the power receiving plate is only in sliding contact with the first contact rod, and the power receiving plate, the first contact rod and the electromagnet are connected in series before the two poles of the power supply to form a closed circuit, so that the electromagnet is energized to generate magnetic force to attract the end rod, and when the opening angle of the wellhead cover is greater than the safety angle, the power receiving plate is only in sliding contact with the second contact rod, and the power receiving plate, the second contact rod and the alarm are connected in series before the two poles of the power supply to form a closed circuit, so that the alarm is energized to emit an audible and visual alarm.

[0012] Preferably, the radius of the fan-shaped protective wing plate is 0.8 to 1 times the rotation radius of the wellhead cover plate, and the central angle of the fan-shaped protective wing plate is 45 to 90 degrees.

[0013] Preferably, the fan-shaped protective wing plate includes an arc frame, two straight frames, and a wire mesh arranged in the fan-shaped area enclosed by the arc frame and the two straight frames; the fan-shaped protective wing plate is vertically connected to the edge of the wellhead cover plate through the straight frames.

[0014] Preferably, the relay rod is arc-shaped and its arc portion is arranged away from the power receiving plate, so that the power receiving plate will not contact the relay rod when sliding between the first contact rod and the second contact rod.

[0015] Preferably, the cover plate base is provided with limiting tongues on both sides of the inner wall near the opening and closing end, and the upper surface of the limiting tongues is provided with end rod brackets. When the wellhead cover plate is in a closed state, its opening and closing end falls on the limiting tongues, and the end rod falls into the end rod bracket and abuts against the electromagnet.

[0016] Preferably, the wellhead cover plate is a square grating plate, and the wellhead cover plate is made of a lightweight profile; a reflective warning strip is provided on the outer edge of the wellhead cover plate.

[0017] Preferably, the power receiving plate is formed by bending an elastic metal sheet and has an arcuate cross section; the arcuate portion of the power receiving plate is in sliding contact with the first contact rod or the second contact rod.

[0018] Preferably, an outer edge of the cover base is provided with a mounting flange, and four corner ends of the mounting flange are provided with screw holes.

[0019] Preferably, the safety angle of the wellhead cover is 30-35°.

[0020] Preferably, the present invention further comprises an insulated flexible protective sleeve which can be freely extended and retracted along the sliding direction of the upper support rod, the flexible protective sleeve is sleeved on the telescopic support rod, and the linkage power receiving assembly is accommodated in the flexible protective sleeve.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The present invention provides fan-shaped protective wings on both sides of the wellhead cover plate, and provides an opening and closing end protection component at the open end of the wellhead cover plate, which can effectively prevent the problem that materials piled near the well are easy to fall and injure the construction workers when they leave or enter the well.

[0023] 2) The present invention arranges a linkage power receiving component on the telescopic support rod, utilizes the opening and closing of the manhole cover to drive the telescopic support to extend and retract, thereby changing the connection state between the power receiving plate and the first contact rod and the second contact rod. When the manhole cover is closed and the opening angle is less than or equal to the safety angle, the end rod will pull out the flexible protection net wound on the spring drum, so as to shield the exposed space at the opening and closing end of the manhole cover plate, so as to prevent the building materials piled at the opening end from falling into the well and causing safety risks. When working out of the well, the construction personnel can observe the environment around the wellhead or the environment inside the well through the pulled out flexible protection net. When the opening and closing angle of the manhole cover is greater than the safety angle, the electromagnet is powered off and loses its adsorption force. The spring drum can automatically roll down and retract the pulled out flexible protection net to facilitate the construction personnel to enter and exit the well. At the same time, the alarm is powered on to emit an audible and visual alarm to remind the relevant construction personnel to pay attention to the situation of entering the well and to remind the construction personnel to close the wellhead cover plate in time after entering and exiting the well.

[0024] Based on the above, it can be seen that when construction personnel enter and exit the well, the present invention does not require additional redundant operations. Only by opening and closing the well cover normally, the coordinated work of the opening and closing end protection components and the alarm can be automatically achieved, which can effectively ensure the safety of construction personnel entering and exiting the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0027] Figure 2 is a top view of the present invention;

[0028] Figure 3 yes Figure 1 Sectional view at AA in the middle;

[0029] Figure 4 It is a schematic diagram of the main structure of the linkage power receiving assembly and the telescopic support rod;

[0030] Figure 5 yes Figure 4 Sectional view at the middle BB;

[0031] Figure 6 yes Figure 5 Cross-section at the middle CC;

[0032] Figure 7 yes Figure 5 Cross-section at DD;

[0033] Figure 8 It is a schematic diagram of the main structure of the present invention in a closed state (without the wire mesh);

[0034] Fig. 9 It is a schematic diagram of the main structure of the present invention in an open and closed state with an opening and closing angle less than a safety angle (without the wire mesh);

[0035] Fig.10 It is a schematic diagram of the main structure of the present invention in an open and closed state with an opening and closing angle greater than a safety angle (without the wire mesh);

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the present invention in an open and closed state with an opening and closing angle smaller than a safety angle;

[0037] The grids in the above figure mean: wellhead cover 1, opening and closing end 101, reflective warning strip 102, cover base 2, limit tongue 201, end rod bracket 202, mounting flange 203, fan-shaped protective wing 3, arc frame 301, end rod guide groove 3011, straight frame 302, opening and closing end protection assembly 4, spring reel 401, end rod 402, flexible protection net 403, telescopic support rod 5, lower support rod 501, upper support rod 502, linkage power receiving assembly 6, first contact rod 601, second contact rod 602, relay rod 603, power receiving plate 604, electromagnet 7, alarm 8, flexible protective sleeve 9. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the following embodiments and drawings are only used to understand the present invention and cannot limit the present invention. The present invention can be implemented in many different ways as defined and covered by the claims.

[0039] Example 1

[0040] Temporary protection devices for wellheads that can prevent the risk of falling, see Figures 1 to 11 , including a cover base 2 arranged in the wellhead 1, a wellhead cover 1 with one end hinged to one side of the inside of the cover base 2 and the other end overlapped to the other side of the inside of the cover base 2 to form an opening and closing end 101, a fan-shaped protective wing plate 3, an opening and closing end protection component 4, a linkage power receiving component 6, a telescopic support rod 5, an electromagnet 7, an alarm 8, and a power supply;

[0041] Wherein, the power source is a battery or a power supply network near the wellhead, which is not shown in the figure;

[0042] The fan-shaped protective wing plate 3 is vertically connected to the edges of both sides of the wellhead cover plate 1 and its center coincides with the hinged rotation axis of the wellhead cover plate 1, so that the fan-shaped protective wing plate 3 can rotate synchronously with the wellhead cover plate 1 around the hinged rotation axis to cover the exposed space on both sides of the wellhead cover plate 1; an end rod guide groove 3011 is arranged along its arc line in the arc frame 301 of the fan-shaped protective wing plate 3, when the end rod 402 instantly loses the adsorption force of the electromagnet 7, the spring reel 401 can retract the flexible protective net 403 into place, and the end rod guide groove 3011 can reduce the falling speed of the end rod 402 through the guiding and damping effect of the end rod guide groove 3011 on the end rod 402, so as to prevent the end rod 402 from hitting the construction personnel entering and leaving the well;

[0043] The opening and closing end protection component 4 includes a spring drum 401 which is arranged in the cover base 2 near the opening and closing end 101 and can roll up the flexible protection net 403 downward, an end rod 402 which is slidably connected to the end rod guide groove 3011 at both ends and has magnetism, and a flexible protection net 403 with one end wound on the spring drum 401 and the other end fixedly connected to the lower edge of the end rod 402; specifically, a torsion spring is arranged in the spring drum 401, and when the wellhead cover 1 is opened, the end rod 402 will synchronously rotate around the hinge axis of the wellhead cover 1 and rise through the adsorption of the electromagnet 7, thereby pulling out the flexible protection net 403 wound on the spring drum 401, and when the end rod 402 instantly loses the adsorption force of the electromagnet 7, under the action of the torsion spring, the flexible protection net 403 is rolled back into place by the spring drum 401, and the end rod 402 returns to the initial position;

[0044] The telescopic support rod 5 is arranged on both sides of the wellhead cover plate 1, and the telescopic support rod 5 includes a lower support rod 501 with one end hingedly connected to the inside of the cover plate base 2, and an upper support rod 502 with one end slidably connected to the lower support rod 501 and the other end hingedly connected to the bottom edge of the wellhead cover plate 1;

[0045] The electromagnet 7 is disposed at the lower edge of the opening and closing end 101 of the wellhead cover plate 1 and is electrically connected to the first contact rod 601 to magnetically cooperate with the end rod 402;

[0046] The alarm 8 is disposed on a side of the cover base 2 away from the engagement end 101 and is electrically connected to the second contact rod 602;

[0047] The linkage power receiving component 6 is arranged on the telescopic support rod 5 on either side, and the linkage power receiving component 6 includes an insulated relay rod 603, a first contact rod 601 and a second contact rod 602 that are conductive and arranged along the sliding direction of the upper support rod 502, and a power receiving plate 604 that is insulated and fixedly arranged on the lower support rod 501 and parallel to the relay rod 603; one end of the first contact rod 601 is insulated and fixedly connected to the upper support rod 502, and the other end is vertically fixedly connected to one end of the relay rod 603; one end of the second contact rod 602 is insulated and slidably connected to the lower support rod 501, and the other end is vertically fixedly connected to the other end of the relay rod 603, so that the ends of the first contact rod 601 and the second contact rod 602 close to each other are staggered and connected along the sliding direction of the support rod 502; the wellhead cover plate 1 is During the opening and closing process, the telescopic support rod 5 is driven to extend and retract, so that the power receiving plate 604 is in sliding contact with the first contact rod 601 or the second contact rod 602; when the wellhead cover plate 1 is in a closed state and the opening angle is less than or equal to the safety angle, the power receiving plate 604 is only in sliding contact with the first contact rod 601, and the power receiving plate 604, the first contact rod 601 and the electromagnet 7 are connected in series before the two poles of the power supply to form a closed circuit, so that the electromagnet 7 is energized to generate magnetic force to attract the end rod 402, and the alarm 8 is not energized at this time; when the opening angle of the wellhead cover plate 1 is greater than the safety angle, the power receiving plate 604 is only in sliding contact with the second contact rod 602, and the power receiving plate 604, the second contact rod 602 and the alarm 8 are connected in series before the two poles of the power supply to form a closed circuit, so that the alarm 8 is energized to emit an audible and visual alarm, and the electromagnet 7 is not energized at this time;

[0048] Based on the above structural description, the working principle of the present invention is as follows: Figure 8 When the wellhead cover plate 1 is in the closed state, the telescopic support rod 5 is in the initial state, and the end rod 402 is in the initial position. At this time, the power receiving plate 604 is located at the farthest position from the second contact rod 602, and the power receiving plate 604 only keeps contact with the first contact rod 601. The power receiving plate 604, the first contact rod 601 and the electromagnet 7 are connected in series before the two poles of the power supply to form a closed circuit, so that the electromagnet 7 is energized to generate magnetic force to attract the end rod 402, so that the wellhead cover plate 1 is firmly covered in the cover plate base 2; please refer to Fig. 9 and Fig.11When it is necessary to exit or enter the well, the wellhead cover plate 1 can be lifted or pulled up at the open end of the wellhead cover plate 1. When the wellhead cover plate 1 is opened to make its opening angle less than or equal to the safety angle, the telescopic support rod 5 is extended, and the upper support rod 502 drives the first contact rod 601 and the second contact rod 602 to move as a whole along the extension direction of the upper support rod 502, while the position of the power receiving plate 604 on the lower support rod 501 remains unchanged. During this process, the power receiving plate 604 is still in sliding contact with the first contact rod 601, but moves toward the second contact rod 602. The positions of the touch rod 602 are close, and the electromagnet 7 will continue to attract the end rod 402. During the opening process of the wellhead cover 1, the flexible protection net 403 wound on the spring drum 401 can be pulled out through the end rod 402, so that the exposed space at the opening and closing end 101 of the wellhead cover 1 can be shielded to prevent the building materials piled at the opening end from falling into the well and causing safety risks. In addition, when working out of the well, the construction personnel can observe the environment around the wellhead or the environment inside the well through the pulled out flexible protection net 403; please refer to Fig.10 When the wellhead cover 1 is opened further to make its opening angle greater than the safety angle, similar to the above, the power receiving plate 604 will pass over the connection between the first contact rod 601 and the second contact rod 602, and finally slide toward the second contact rod 602 and maintain sliding contact with the second contact rod 602. At this time, the power receiving plate 604 is not in sliding contact with the first contact rod 601, the electromagnet 7 is powered off and loses its adsorption force, and the spring reel 401 automatically rolls down and retracts the already pulled out flexible protection net 403 to facilitate the construction personnel to enter and exit the well; at the same time, the power receiving plate 604, the second contact rod 602 and the alarm 8 are connected in series before the two poles of the power supply to form a closed circuit, so that the alarm 8 is powered on and emits a sound. An audible and visual alarm is given to remind construction personnel or construction machinery outside the well to pay attention to construction personnel leaving the well at the wellhead, or to remind construction personnel or construction machinery inside the well to pay attention to construction personnel entering the well at the wellhead, and to remind construction personnel to close the wellhead cover 1 in time after entering and exiting the well; in addition, when the wellhead cover 1 is opened, since the wellhead cover 1 is hinged to the cover base 2, the wellhead cover 1 will rotate around the hinged rotation axis, thereby driving the fan-shaped protective wing plate 3 to rotate around its center of circle. At this time, the fan-shaped protective wing plate 3 moves synchronously to block the exposed space on both sides of the wellhead cover 1, thereby effectively preventing building materials on both sides of the wellhead from falling and injuring construction personnel who are preparing to exit the well.

[0049] Furthermore, in a preferred embodiment, the radius of the fan-shaped protective wing plate 3 is 0.8 to 1 times the rotation radius of the wellhead cover plate 1, and the central angle of the fan-shaped protective wing plate 3 is 45 to 90°.

[0050] In order to reduce the overall weight of the fan-shaped protective wing plate 3 so that it can be opened with the wellhead cover plate 1, further, in a preferred embodiment, please refer to Figure 1 and Figure 8The fan-shaped protective wing plate 3 includes an arc frame 301, two straight frames 302, and a wire mesh 303 arranged in a fan-shaped area enclosed by the arc frame 301 and the two straight frames 302; the fan-shaped protective wing plate 3 is vertically connected to the edge of the wellhead cover plate 1 through the straight frames 302.

[0051] Further, in a preferred embodiment, see Figure 5 and Figure 6 The relay rod 603 is arc-shaped and its arc portion is arranged away from the power receiving plate 604, so that the power receiving plate 604 will not contact the relay rod 603 when sliding between the first contact rod 601 and the second contact rod 602, thereby improving the service life of the power receiving plate 604.

[0052] In order to make the electromagnet 7 better cooperate with the end rod 402 by magnetic attraction, further, in a preferred embodiment, please refer to Figure 8 and Fig. 9 The cover base 2 is provided with limiting tongues 201 on both sides of the inner wall near the opening and closing end 101, and the upper surface of the limiting tongues 201 is provided with end rod brackets 202. When the wellhead cover 1 is in a closed state, its opening and closing end 101 falls on the limiting tongues 201, and the end rod 402 falls into the end rod bracket 202 and abuts against the electromagnet 7.

[0053] In order to reduce the weight of the wellhead cover 1 to facilitate opening while maintaining good strength, further, in a preferred embodiment, please refer to Figure 2 and Fig.11 The wellhead cover plate 1 is a square grid plate, and the wellhead cover plate 1 is made of a lightweight profile. A reflective warning strip 102 is provided on the outer edge of the wellhead cover plate 1.

[0054] Further, in a preferred embodiment, see Figure 4 , Figure 7 and Fig. 9 The power receiving plate 604 is formed by bending an elastic metal sheet and has an arcuate cross section; the arcuate portion of the power receiving plate 604 is in sliding contact with the first contact rod 601 or the second contact rod 602, so that the power receiving plate 604 can maintain good contact with the first contact rod 601 or the second contact rod 602 and be conductively connected with the first contact rod 601 or the second contact rod 602.

[0055] In order to facilitate the installation of the device of the present invention at the wellhead, further, in a preferred embodiment, please refer to Figure 2 and Fig.11 The outer edge of the cover base 2 is provided with a mounting flange 203 , and the four corner ends of the mounting flange 203 are provided with screw holes.

[0056] Furthermore, in a preferred embodiment, the safety angle of the wellhead cover plate 1 is 30-35°.

[0057] In order to prevent the construction personnel entering and leaving the well from touching the components of the linkage power receiving assembly 6 and causing the risk of electric shock, further, in a preferred embodiment, please refer to Figure 4 The present invention also includes an insulated flexible protective sleeve 9 that can be freely extended and retracted along the sliding direction of the upper support rod 502. The flexible protective sleeve 9 is sleeved on the telescopic support rod 5, and the linkage power receiving component 6 is accommodated in the flexible protective sleeve 604.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temporary wellhead protection device capable of preventing the danger of falling, comprising a power source, a cover base arranged in the wellhead, a wellhead cover having one end hinged to one side of the inside of the cover base and the other end overlapped to the other side of the inside of the cover base to form an open and closed end, characterized in that: Also includes: A fan-shaped protective wing plate, wherein the fan-shaped protective wing plate is vertically connected to the edges of both sides of the wellhead cover plate and the center of the circle coincides with the hinged rotation axis of the wellhead cover plate, and an end rod guide groove is arranged along the arc line of the circular arc frame of the fan-shaped protective wing plate; The opening and closing end protection assembly includes a spring drum arranged in the cover base near the opening and closing end and capable of rolling up the flexible protection net downward, an end rod having two ends slidably connected to the end rod guide groove and having magnetism, and a flexible protection net having one end wound around the spring drum and the other end fixedly connected to the lower edge of the end rod; A telescopic support rod, the telescopic support rod is arranged on both sides of the wellhead cover plate, the telescopic support rod comprises a lower support rod hingedly connected to the inside of the cover plate base at one end, an upper support rod slidably connected to the lower support rod at one end and hingedly connected to the bottom edge of the wellhead cover plate at the other end; An electromagnet, which is disposed at the lower edge of the opening and closing end of the wellhead cover plate and is electrically connected to the first contact rod to magnetically cooperate with the end rod; an alarm, the alarm being arranged at a side of the cover base away from the engagement end and being electrically connected to the second contact rod; and, A linkage power receiving component, wherein the linkage power receiving component is arranged on the telescopic support rod on either side, and the linkage power receiving component includes an insulated relay rod, a first contact rod and a second contact rod that are conductive and arranged along the sliding direction of the upper support rod, and a power receiving plate that is insulated and fixedly arranged on the lower support rod; one end of the first contact rod is insulated and fixedly connected to the upper support rod, and the other end is vertically fixedly connected to one end of the relay rod; one end of the second contact rod is insulated and slidably connected to the lower support rod, and the other end is vertically fixedly connected to the other end of the relay rod; the wellhead cover plate drives the telescopic support rod to extend and retract during the opening and closing process. The electric plate is contracted so that the power receiving plate is in sliding contact with the first contact rod or the second contact rod; when the wellhead cover is in a closed state and the opening angle is less than or equal to the safety angle, the power receiving plate is only in sliding contact with the first contact rod, and the power receiving plate, the first contact rod and the electromagnet are connected in series before the two poles of the power supply to form a closed circuit, so that the electromagnet is energized to generate magnetic force to attract the end rod, and when the opening angle of the wellhead cover is greater than the safety angle, the power receiving plate is only in sliding contact with the second contact rod, and the power receiving plate, the second contact rod and the alarm are connected in series before the two poles of the power supply to form a closed circuit, so that the alarm is energized to emit an audible and visual alarm.

2. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The radius of the fan-shaped protective wing plate is 0.8 to 1 times the rotation radius of the wellhead cover plate, and the central angle of the fan-shaped protective wing plate is 45 to 90 degrees.

3. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The fan-shaped protective wing plate includes an arc frame, two straight frames, and a wire mesh arranged in a fan-shaped area enclosed by the arc frame and the two straight frames; the fan-shaped protective wing plate is vertically connected to the edge of the wellhead cover plate through the straight frames.

4. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The relay rod is arc-shaped and its arc portion is arranged away from the power receiving plate, so that the power receiving plate will not contact the relay rod when sliding between the first contact rod and the second contact rod.

5. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The cover base is provided with limiting tongues on both sides of the inner wall near the opening and closing end, and the upper surface of the limiting tongues is provided with end rod brackets. When the wellhead cover is in a closed state, its opening and closing end falls on the limiting tongues, and the end rod falls into the end rod bracket and abuts against the electromagnet.

6. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The wellhead cover plate is a square grid plate, the wellhead cover plate is made of a lightweight profile, and a reflective warning strip is arranged on the outer edge of the wellhead cover plate.

7. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The power receiving plate is formed by bending an elastic metal sheet and has an arcuate cross section; the arcuate portion of the power receiving plate is in sliding contact with the first contact rod or the second contact rod.

8. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The outer edge of the cover base is provided with a mounting flange, and four corner ends of the mounting flange are provided with screw holes.

9. The temporary protection device for a wellhead capable of preventing the danger of falling as claimed in claim 1, characterized in that: The safety angle of the wellhead cover is 30-35°.

10. A temporary wellhead protection device capable of preventing the danger of falling as claimed in any one of claims 1 to 9, characterized in that: It also includes an insulated flexible protective sleeve that can be freely extended and retracted along the sliding direction of the upper support rod. The flexible protective sleeve is sleeved on the telescopic support rod, and the linked power receiving component is accommodated in the flexible protective sleeve.

Images