Semi-automatic continuous extractor

Abstract

The utility model relates to the technical field of aviation kerosene detection, in particular to a semi-automatic continuous extractor, which comprises a needle cylinder, a piston rod, a support frame, a moving block, a grip and a pressing handle, the needle cylinder is fixed on the support frame, and the moving block movably arranged on the support frame is fixed with the piston rod. During operation, the grip and the pressing handle are held by one hand at the same time, the pressing handle is pressed and pressed to enable the moving block to move along the supporting frame, so that the piston rod is pulled out of the needle cylinder, the operation of pulling the piston to extract oil by one hand is achieved, more labor is saved, operation is easy, and the technical problem that in the prior art, pulling of the piston to extract oil is strenuous is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation kerosene detection, and more specifically, to a semi-automatic continuous extractor. Background Art

[0002] During the process of receiving, storing, distributing and preparing for the fuel filling of aircraft, it is necessary to extract fuel samples for the detection of trace water by chemical water detector. Only after the test is qualified can the related operations of receiving, storing, distributing and filling aircraft with fuel be carried out. The current method of testing the water content of fuel is to extract the oil with a syringe. The syringe does not slide smoothly and leaks, resulting in low accuracy, which cannot meet the requirements of accurate extraction and affects the daily oil quality inspection operation.

[0003] For example, the prior art discloses an aviation fuel water detector syringe, comprising a chemical water detector joint, an outer shell with openings at both ends, a transparent inner shell with openings at both ends, and a piston assembly; the chemical water detector joint is arranged at one end of the outer shell, and the inner shell is placed in the outer shell; the piston assembly can be extended and retracted in the inner shell, and is used to draw the oil from the chemical water detector joint into the inner shell; the outer shell is provided with a window along the extension and retraction direction of the piston assembly; the piston assembly and the other end of the outer shell are locked by a fixing nut, and after the fixing nut is locked, the two ends of the inner shell can be sealed and pressed tightly between the chemical water detector joint and the fixing nut.

[0004] The syringes in the prior art require both hands to operate, and there are problems with the syringe being difficult to pull up or the syringe piston being pulled off. During operation, the hands are easily exposed to the oil and cause injury. The rubber of the syringe piston hardens after contacting the jet fuel, and there is a technical problem that it is difficult to pull the piston to extract the oil. Utility Model Content

[0005] The utility model aims to overcome the drawback of the prior art that it is laborious to pull a piston to extract oil products, and to provide a semi-automatic continuous extractor.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A semi-automatic continuous extractor comprises a syringe and a piston rod, and also comprises a support frame for fixing the syringe, a moving block movably arranged on the support frame and used to fix the piston rod, a handle arranged on the support frame, and a pressure handle movably arranged on the handle, wherein pressing the pressure handle can cause the moving block to move along the support frame to pull the piston rod out of the syringe.

[0008] A semi-automatic continuous extractor of the present utility model fixes a syringe barrel on a support frame. A moving block movably arranged on the support frame is fixed to a piston rod. Since a pressing handle is movably connected to a grip, when operating, one hand holds the grip and the pressing handle simultaneously, and presses the pressing handle to make the moving block move along the support frame, so that the piston rod is pulled out of the syringe barrel, realizing the operation of pulling the piston with one hand to extract oil products, which is more labor-saving and has simple operation, effectively solving the technical problem of laborious piston pulling for oil product extraction in the prior art.

[0009] Further, the support frame is movably provided with a moving rod. The moving rod can move axially relative to the support frame. The moving block is sleeved on the outer wall of the moving rod. One end of the pressing handle is rotatably connected to the grip, and the other end is provided with a pulling structure. When the pressing handle is pressed, the pulling structure can drive the moving rod to move backward, and when the pressing handle returns to its original position, the pulling structure does not drive the moving rod to move. Since the moving rod can move axially relative to the support frame, the moving block is sleeved on the outer wall of the moving rod to make the moving block move synchronously with the moving rod. Since one end of the pressing handle is rotatably connected to the grip and the other end is provided with a pulling structure, when the pressing handle is pressed, the pulling structure can drive the moving rod to move backward, and when the pressing handle returns to its original position, the pulling structure does not drive the moving rod to move, realizing the operation of extracting oil products multiple times by repeatedly pressing the pressing handle, reducing the extraction amount of oil products per time and improving the extraction accuracy of oil products.

[0010] Further, the pulling structure includes a friction plate. One end of the friction plate is provided with a movable column rotatably connected to the pressing handle, and the other end is provided with a friction hole. The moving rod passes through the friction hole. The distance between the left side and the right side of the friction hole is equal to the outer diameter of the moving rod, and the distance between the upper side and the lower side of the friction hole is greater than the outer diameter of the moving rod. When the pressing handle is pulled, the upper and lower sides of the friction hole can respectively abut against the outer wall of the moving rod so that the friction plate can pull the moving rod backward. When the pressing handle returns to its original position, the upper and lower sides of the friction hole do not abut against the moving rod. Since the distance between the left side and the right side of the friction hole is equal to the outer diameter of the moving rod, and the distance between the upper side and the lower side of the friction hole is greater than the outer diameter of the moving rod, when the upper and lower sides of the friction hole do not abut against the moving rod, the moving rod can freely pass through the friction hole, and the pressing handle will not drive the moving rod to move when it returns to its original position. When the pressing handle is pulled, the upper and lower sides of the friction hole can respectively abut against the outer wall of the moving rod and are fixed to the moving rod through the frictional force generated by contacting the outer wall of the moving rod. Therefore, the friction plate can pull the moving rod backward.

[0011] Further, an activity groove is provided at the top end of the pressure handle. The activity column is rotatably arranged in the activity groove and can slide up and down in the activity groove. Since the activity column is rotatably arranged in the activity groove and can slide up and down in the activity groove, the angle at which the friction plate can be tilted is not restricted by the vertical movement dimension, increasing the pressing stroke of the pressure handle and the distance that the friction plate can pull the moving rod to axially move.

[0012] Further, two side support plates are arranged in the support frame. The friction plate is arranged between the two side support plates. The moving rod passes through the support plates. The end of the pressure handle can abut against the support plate on the side close to the syringe barrel. A spring is arranged between the friction plate and the support plate on the side away from the syringe barrel. The spring is sleeved outside the moving rod. The spring applies an elastic force to the friction plate to keep the pressure handle in its original position. By arranging a spring between the friction plate and the support plate on the side away from the syringe barrel, sleeving the spring outside the moving rod, and applying an elastic force to the friction plate to keep the pressure handle in its original position, automatic reset of the pressure handle is realized.

[0013] Further, a limiting plate is also arranged in the support frame. The moving block is arranged between the friction plate and the limiting plate. The moving rod passes through the limiting plate. A limiting head is arranged at one end of the moving rod close to the limiting plate. The outer diameter of the limiting head is larger than the outer diameter of the moving rod. Since the outer diameter of the limiting head is larger than the outer diameter of the moving rod, it is avoided that the moving rod disengages from the limiting plate, playing a role in limiting the maximum stroke.

[0014] Further, a holding plate is arranged in the support frame. One end of the holding plate is provided with a limiting column rotatably connected to the support frame, and the other end is provided with an unlocking part. A limiting hole is arranged between the unlocking part and the limiting column of the holding plate. The moving rod passes through the limiting hole; the distance between the left side and the right side of the limiting hole is equal to the outer diameter of the moving rod, and the distance between the upper side and the lower side of the limiting hole is larger than the outer diameter of the moving rod; a tension spring is arranged between the holding plate and the support frame. The tension spring applies a pulling force to the holding plate. The upper and lower sides of the limiting hole respectively abut against the outer wall of the moving rod under the action of the pulling force so that the holding plate prevents the moving rod from moving forward. Since the tension spring applies a pulling force to the holding plate, the upper and lower sides of the limiting hole respectively abut against the outer wall of the moving rod under the action of the pulling force so that the holding plate remains in a state of preventing the moving rod from moving forward, avoiding automatic retraction of the piston rod during oil extraction. After the oil extraction is completed, by pulling the unlocking part, the holding plate rotates relative to the support frame, so that the upper and lower sides of the limiting hole do not abut against the outer wall of the moving rod, and thus the restriction of the holding plate on the moving rod can be released, and the piston rod can freely retract to its original position.

[0015] Furthermore, a limiting groove is vertically provided on the support frame, and the limiting post is rotatably arranged in the limiting groove and can slide up and down in the limiting groove. Since the limiting post is rotatably arranged in the limiting groove and can slide up and down in the limiting groove, the tilt angle that the holding plate can maintain is not restricted by the vertical movement dimension.

[0016] Furthermore, an adjusting bolt is threadedly connected to the bottom of the moving block, and the adjusting bolt can abut against the outer wall of the moving rod. The connection between the moving block and the moving rod is fixed by using the adjusting bolt to abut against the outer wall of the moving rod, and the stroke range of the piston rod can be adjusted for different syringes.

[0017] Furthermore, a fixed cylinder is provided on the support frame. The fixed cylinder is provided with a fixed groove for accommodating the syringe and a protective plate for covering the syringe. One side of the protective plate is rotatably connected to the fixed cylinder, and the other side is snap-connected to the fixed cylinder. Since one side of the protective plate is rotatably connected to the fixed cylinder, after the syringe is placed in the fixed groove, the protective plate is covered above the syringe. Since the other side of the protective plate is snap-connected to the fixed cylinder, it is ensured that the syringe is effectively fixed and at the same time is convenient for disassembly and replacement.

[0018] Compared with the prior art, the beneficial effects of the present utility model are:

[0019] For a semi-automatic continuous extractor of the present utility model, when operating, hold the grip and the pressing handle with one hand at the same time, and press the pressing handle to make the moving block move along the support frame, so that the piston rod is pulled out from the syringe, realizing the operation of pulling the piston with one hand to extract the oil product, which is more labor-saving and simple to operate, and effectively solves the technical problem of the laborious operation of pulling the piston to extract the oil product in the prior art. Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of a semi-automatic continuous extractor;

[0021] Figure 2 It is a cross-sectional view of a semi-automatic continuous extractor;

[0022] Figure 3 It is a structural schematic diagram of a friction plate;

[0023] Figure 4 It is a structural schematic diagram of a fixed cylinder;

[0024] Figure 5 It is a structural schematic diagram of a holding plate;

[0025] In the attached drawings: 1, syringe barrel; 2, piston rod; 3, support frame; 31, support plate; 32, limit plate; 33, limit groove; 4, moving block; 5, grip; 6, pressing handle; 61, movable groove; 7, moving rod; 71, limit head; 8, friction plate; 81, movable column; 82, friction hole; 9, spring; 10, holding plate; 101, limit column; 102, unlocking part; 103, limit hole; 104, tension spring; 11, fixed cylinder; 111, fixed groove; 12, protection plate. Detailed implementation manners

[0026] The following further explains the present utility model in conjunction with the detailed implementation manners. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation of this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0027] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] As Figures 1 to 4 shown is the first embodiment of a semi-automatic continuous extractor of the present utility model.

[0030] A semi-automatic continuous extractor, comprising a syringe barrel 1 and a piston rod 2, further comprising a support frame 3 for fixing the syringe barrel 1, a moving block 4 movably arranged on the support frame 3 and used for fixing the piston rod 2, a grip 5 arranged on the support frame 3, and a pressing handle 6 movably arranged on the grip 5. Pressing the pressing handle 6 can make the moving block 4 move along the support frame 3 so that the piston rod 2 is pulled out of the syringe barrel 1. Among them, a moving rod 7 is movably arranged on the support frame 3, and the moving rod 7 can move axially relative to the support frame 3. The moving block 4 is sleeved on the outer wall of the moving rod 7. One end of the pressing handle 6 is rotatably connected to the grip 5, and the other end is provided with a pulling structure. When the pressing handle 6 is pressed, the pulling structure can drive the moving rod 7 to move backward, and when the pressing handle 6 returns to its original position, the pulling structure does not drive the moving rod 7 to move. Among them, the pulling structure includes a friction plate 8. One end of the friction plate 8 is provided with a movable column 81 rotatably connected to the pressing handle 6, and the other end is provided with a friction hole 82. The moving rod 7 passes through the friction hole 82. The distance between the left side and the right side of the friction hole 82 is equal to the outer diameter of the moving rod 7, and the distance between the upper side and the lower side of the friction hole 82 is greater than the outer diameter of the moving rod 7. When the pressing handle 6 is pressed, the upper and lower sides of the friction hole 82 can respectively abut against the outer wall of the moving rod 7 so that the friction plate 8 can pull the moving rod 7 backward. When the pressing handle 6 returns to its original position, the upper and lower sides of the friction hole 82 do not abut against the moving rod 7. Among them, an adjusting bolt is threadedly connected to the bottom of the moving block 4, and the adjusting bolt can abut against the outer wall of the moving rod 7. Among them, the support frame 3 is provided with a fixing cylinder 11. The fixing cylinder 11 is provided with a fixing groove 111 for accommodating the syringe barrel 1 and a protection plate 12 for covering the syringe barrel 1. One side of the protection plate 12 is rotatably connected to the fixing cylinder 11, and the other side is snap-connected to the fixing cylinder 11.

[0031] In this embodiment, as Figure 1 shown, the syringe barrel 1 is fixed on the support frame 3. The moving block 4 movably arranged on the support frame 3 is fixed to the piston rod 2. Since the pressing handle 6 is movably connected to the grip 5, when operating, hold the grip 5 and the pressing handle 6 with one hand at the same time. Press the pressing handle 6 to make the moving block 4 move along the support frame 3, so that the piston rod 2 is pulled out of the syringe barrel 1, realizing the operation of pulling the piston to extract oil with one hand, which is more labor-saving and has a simple operation, effectively solving the technical problem of laborious oil extraction by pulling the piston in the prior art.

[0032] In this embodiment, as Figure 2 shown, since the moving rod 7 can move axially relative to the support frame 3, the moving block 4 is sleeved on the outer wall of the moving rod 7 so that the moving block 4 moves synchronously with the moving rod 7. Since one end of the pressing handle 6 is rotatably connected to the grip 5 and the other end is provided with a pulling structure, when the pressing handle 6 is pressed, the pulling structure can drive the moving rod 7 to move backward, and when the pressing handle 6 returns to its original position, the pulling structure does not drive the moving rod 7 to move, realizing the operation of repeatedly pressing the pressing handle 6 to extract oil multiple times, reducing the amount of oil extracted each time, and improving the accuracy of oil extraction.

[0033] In this embodiment, asFigure 2 and Figure 3 As shown in Figure 3 , since the distance between the left side and the right side of the friction hole 82 is equal to the outer diameter of the moving rod 7, and the distance between the upper side and the lower side of the friction hole 82 is greater than the outer diameter of the moving rod 7, when neither the upper and lower sides of the friction hole 82 are in contact with the moving rod 7, the moving rod 7 can freely pass through the friction hole 82, and the moving rod 7 will not be driven to move when the pressing handle 6 resets. When the pressing handle 6 is triggered, the upper and lower sides of the friction hole 82 can respectively abut against the outer wall of the moving rod 7 and are fixed to the moving rod 7 through the frictional force generated by contacting the outer wall of the moving rod 7. Therefore, the friction plate 8 can pull the moving rod 7 backward.

[0034] In this embodiment, the moving block 4 is connected and fixed to the moving rod 7 by using an adjusting bolt to abut against the outer wall of the moving rod 7, and the stroke range of the piston rod 2 can be adjusted for different syringes 1.

[0035] In this embodiment, as Figure 4 shown in Figure 4 , since one side of the guard plate 12 is rotatably connected to the fixed cylinder 11, after the syringe 1 is placed in the fixed groove 111, the guard plate 12 is covered above the syringe 1. Since the other side of the guard plate 12 is snap-fitted to the fixed cylinder 11, it ensures the effective fixation of the syringe 1 while facilitating disassembly and replacement.

[0036] Embodiment Two

[0037] As Figures 2 to 3 shown in Figures 2 to 3 is the second embodiment of a semi-automatic continuous extractor of the present utility model.

[0038] This embodiment is similar to Embodiment One, the difference being that: an activity groove 61 is provided at the top of the pressing handle 6, and the activity column 81 is rotatably arranged in the activity groove 61 and can slide up and down along the activity groove 61. Among them, two side support plates 31 are provided in the support frame 3, the friction plate 8 is arranged between the two side support plates 31, the moving rod 7 passes through the support plate 31, the end of the pressing handle 6 can abut against the support plate 31 on the side close to the syringe 1, and a spring 9 is provided between the friction plate 8 and the support plate 31 on the side far from the syringe 1. The spring 9 is sleeved outside the moving rod 7, and the spring 9 applies an elastic force to the friction plate 8 to keep the pressing handle 6 in place. Among them, a limiting plate 32 is also provided in the support frame 3, the moving block 4 is arranged between the friction plate 8 and the limiting plate 32, the moving rod 7 passes through the limiting plate 32, and a limiting head 71 is provided at one end of the moving rod 7 close to the limiting plate 32. The outer diameter of the limiting head 71 is greater than the outer diameter of the moving rod 7.

[0039] In this embodiment, as Figure 2 and Figure 3As shown, since the movable column 81 is rotatably arranged in the movable groove 61 and the movable column 81 can slide up and down in the movable groove 61, it is ensured that the tilt angle of the friction plate 8 is not restricted by the vertical movement dimension, increasing the pressing stroke of the pressing handle 6 and improving the distance that the friction plate 8 can pull the movable rod 7 to move axially.

[0040] In this embodiment, as Figure 2 shown, a spring 9 is provided between the friction plate 8 and the support plate 31 on the side away from the syringe barrel 1. The spring 9 is sleeved outside the movable rod 7, and by applying an elastic force to the friction plate 8 to keep the pressing handle 6 in place, automatic reset of the pressing handle 6 is achieved.

[0041] In this embodiment, as Figure 2 shown, since the outer diameter of the limit head 71 is greater than the outer diameter of the movable rod 7, it is avoided that the movable rod 7 disengages from the limit plate 32, playing a role in limiting the maximum stroke.

[0042] Embodiment Three

[0043] As Figure 1 、 Figure 2 and Figure 5 shown is the third embodiment of a semi-automatic continuous extractor of the present utility model.

[0044] This embodiment is similar to Embodiment One or Embodiment Two, the difference being that: a holding plate 10 is provided in the support frame 3. One end of the holding plate 10 is provided with a limit post 101 rotatably connected to the support frame 3, and the other end is provided with an unlocking portion 102. The holding plate 10 is provided with a limit hole 103 between the unlocking portion 102 and the limit post 101, and the movable rod 7 passes through the limit hole 103; the distance between the left side and the right side of the limit hole 103 is equal to the outer diameter of the movable rod 7, and the distance between the upper side and the lower side of the limit hole 103 is greater than the outer diameter of the movable rod 7; a tension spring 104 is provided between the holding plate 10 and the support frame 3, and the tension spring 104 applies a pulling force to the holding plate 10. The upper and lower sides of the limit hole 103 are respectively abutted against the outer wall of the movable rod 7 under the action of the pulling force so that the holding plate 10 prevents the movable rod 7 from moving forward. Among them, the support frame 3 is vertically provided with a limit groove 33, and the limit post 101 is rotatably arranged in the limit groove 33 and the limit post 101 can slide up and down in the limit groove 33.

[0045] In this embodiment, as Figure 2 and Figure 5As shown, since the tension spring 104 applies a tensile force to the holding plate 10, the upper and lower sides of the limiting hole 103 are respectively abutted against the outer wall of the moving rod 7 under the action of the tensile force, so that the holding plate 10 is maintained in a state of preventing the moving rod 7 from moving forward, avoiding the automatic retraction of the piston rod 2 during the oil extraction process. After the oil extraction is completed, by pulling the unlocking portion 102, the holding plate 10 rotates relative to the support frame 3, so that the upper and lower sides of the limiting hole 103 are not abutted against the outer wall of the moving rod 7, and thus the restriction of the holding plate 10 on the moving rod 7 can be released, and the piston rod 2 can freely retract to its original position.

[0046] In this embodiment, as Figure 1 and Figure 5 shown, since the limiting column 101 is rotatably arranged in the limiting groove 33 and the limiting column 101 can slide up and down in the limiting groove 33, it is ensured that the tilt angle of the holding plate 10 is not restricted by the vertical movement dimension.

[0047] In the specific content of the above specific implementation manner, each technical feature can be combined arbitrarily without contradiction. For the sake of brevity of description, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features does not exist in contradiction, it should be considered to be within the scope described in this specification.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manner of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A semi-automatic continuous extractor, comprising a syringe (1) and a piston rod (2), characterized in that: It also comprises a support frame (3) for fixing the syringe (1), a moving block (4) movably arranged on the support frame (3) and used to fix the piston rod (2), a handle (5) arranged on the support frame (3), and a pressure handle (6) movably arranged on the handle (5), wherein pressing the pressure handle (6) can cause the moving block (4) to move along the support frame (3) so that the piston rod (2) can be pulled out of the syringe (1).

2. A semi-automatic continuous extractor according to claim 1, characterized in that: The support frame (3) is movably provided with a moving rod (7), and the moving rod (7) can move axially relative to the support frame (3). The moving block (4) is sleeved on the outer wall of the moving rod (7). One end of the pressing handle (6) is rotatably connected to the grip (5), and the other end is provided with a pulling structure. When the pressing handle (6) is buckled, the pulling structure can drive the moving rod (7) to move backward. When the pressing handle (6) is reset, the pulling structure does not drive the moving rod (7) to move.

3. A semi-automatic continuous extractor according to claim 2, characterized in that: The pulling structure comprises a friction plate (8), one end of the friction plate (8) is provided with a movable column (81) rotatably connected to the pressing handle (6), and the other end is provided with a friction hole (82), the moving rod (7) is inserted into the friction hole (82), the distance between the left side and the right side of the friction hole (82) is equal to the outer diameter of the moving rod (7), the distance between the upper side and the lower side of the friction hole (82) is greater than the outer diameter of the moving rod (7), when the pressing handle (6) is pressed, the upper and lower sides of the friction hole (82) can respectively abut against the outer wall of the moving rod (7) so that the friction plate (8) can pull the moving rod (7) backward, and when the pressing handle (6) is reset, the upper and lower sides of the friction hole (82) are not abutted against the moving rod (7).

4. A semi-automatic continuous extractor according to claim 3, characterized in that: A movable groove (61) is provided at the top end of the pressing handle (6), and the movable column (81) is rotatably arranged in the movable groove (61), and the movable column (81) can slide up and down along the movable groove (61).

5. A semi-automatic continuous extractor according to claim 3, characterized in that: The support frame (3) is provided with support plates (31) on both sides, the friction plate (8) is arranged between the support plates (31) on both sides, the moving rod (7) is passed through the support plates (31), the end of the pressing handle (6) can abut against the support plate (31) on the side close to the syringe (1), a spring (9) is provided between the friction plate (8) and the support plate (31) on the side away from the syringe (1), the spring (9) is sleeved outside the moving rod (7), and the spring (9) applies an elastic force to the friction plate (8) for keeping the pressing handle (6) in place.

6. A semi-automatic continuous extractor according to claim 3, characterized in that: A limit plate (32) is also provided in the support frame (3); the moving block (4) is provided between the friction plate (8) and the limit plate (32); the moving rod (7) is passed through the limit plate (32); a limit head (71) is provided at one end of the moving rod (7) close to the limit plate (32); and the outer diameter of the limit head (71) is larger than the outer diameter of the moving rod (7).

7. A semi-automatic continuous extractor according to claim 2, characterized in that: A retaining plate (10) is provided inside the support frame (3); one end of the retaining plate (10) is provided with a limiting column (101) rotatably connected to the support frame (3); the other end is provided with an unlocking portion (102); the retaining plate (10) is provided with a limiting hole (103) between the unlocking portion (102) and the limiting column (101); the moving rod (7) is inserted into the limiting hole (103); the spacing between the left side and the right side of the limiting hole (103) is equal to the spacing between the two ends of the limiting hole (103); The outer diameter of the moving rod (7), the spacing between the upper side and the lower side of the limiting hole (103) is greater than the outer diameter of the moving rod (7); a tension spring (104) is provided between the retaining plate (10) and the support frame (3), the tension spring (104) applies a tensile force to the retaining plate (10), and the upper and lower sides of the limiting hole (103) respectively abut against the outer wall of the moving rod (7) under the action of the tensile force so that the retaining plate (10) prevents the moving rod (7) from moving forward.

8. A semi-automatic continuous extractor according to claim 7, characterized in that: The support frame (3) is vertically provided with a limiting groove (33), the limiting column (101) can be rotatably arranged in the limiting groove (33), and the limiting column (101) can slide up and down along the limiting groove (33).

9. A semi-automatic continuous extractor according to claim 2, characterized in that: The bottom of the moving block (4) is threadedly connected with an adjusting bolt, and the adjusting bolt can abut against the outer wall of the moving rod (7).

10. A semi-automatic continuous extractor according to claim 1, characterized in that: The support frame (3) is provided with a fixed cylinder (11), the fixed cylinder (11) is provided with a fixed groove (111) for accommodating the syringe (1) and a protective plate (12) for covering the syringe (1), one side of the protective plate (12) is rotatably connected to the fixed cylinder (11), and the other side is snap-connected to the fixed cylinder (11).

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