Tree core ejection device

Abstract

The invention belongs to the technical field of forestry investigation tools, and particularly relates to a tree core ejection device which comprises a leading-in cylinder, a pushing device and a pushing device. The guide-in barrel baffle is coupled to the middle of the guide-in barrel; the piston barrel baffle is coupled to the bottom of the guide-in barrel; the piston assembly vertically slides in the leading-in cylinder and is arranged between the leading-in cylinder baffle and the piston cylinder baffle, the top of the piston assembly penetrates through the leading-in cylinder baffle and is used for striking a sample in the growth cone, the bottom of the piston assembly extends out of the piston cylinder baffle, and the bottom of the piston assembly is in limiting fit with the piston cylinder baffle; the piston assembly is elastically connected with the guide-in cylinder baffle. By pulling the bottom of the piston assembly, the top of the piston assembly moves in the direction away from the guide-in barrel baffle, then a growth cone drill bit is placed into the guide-in barrel, after the angle of the drill bit is adjusted, the axis of the sample and the axis of the piston assembly are collinear, the bottom of the piston assembly is loosened, and the top of the piston assembly strikes the sample. The sample is loosened from the inner wall of the growth cone drill bit, so that the sample is conveniently taken out.

Description

Technical Field

[0001] The present invention belongs to the technical field of forestry survey tools, and particularly relates to a tree core ejection device. Background Art

[0002] In forest resource surveys and ecological research, the increment borer, as the core tool for tree ring sampling, its operation efficiency directly affects the quality and efficiency of field data. However, when facing hard tree species or large-diameter trees, the problem of tree core jamming is particularly prominent - especially in extreme habitats such as karst, high altitude, arid, and cold regions. To adapt to the stress environment, such trees often enhance their stress resistance through physiological mechanisms such as increasing wood density, optimizing fiber arrangement, or thickening the bark. These characteristics significantly increase the frictional resistance between the sampling tool and the wood, doubling the risk of tree core retention. In the prior art, the abnormal friction between the inner wall of the increment borer and the tree core not only severely delays the sampling process, but may also cause the work to be interrupted due to tool failure or sample damage. When there is no backup plan, such failures will have a systematic impact on the progress of field surveys.

[0003] Traditional means of dealing with the problem of core jamming mostly rely on physical knocking or manual prying. However, due to the narrow space inside the increment borer and the fragile nature of the sample, such methods often have little effect. Rough external force intervention not only makes it difficult to apply force precisely, but may also exacerbate the wear of the cone head edge, shortening the service life of the tool. At the same time, the unstable mechanical transmission easily causes the tree core structure to be squeezed or broken, damaging the integrity of the tree ring information. More notably, during the process of physical knocking or manual prying by the operator, the safety hazards such as instrument slippage or fragment splashing increase significantly, posing a potential threat to personnel safety.

[0004] Therefore, there is an urgent need for a tree core ejection device to facilitate the extraction of samples inside the increment borer. Summary of the Invention

[0005] The purpose of the present invention is to provide a tree core ejection device to solve the above problems.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] A tree core ejection device, comprising:

[0008] An introduction cylinder;

[0009] An introduction cylinder baffle, pivotally connected to the middle of the introduction cylinder;

[0010] A piston cylinder baffle, pivotally connected to the bottom of the introduction cylinder;

[0011] The piston assembly slides vertically within the introduction cylinder. The piston assembly is disposed between the introduction cylinder baffle and the piston cylinder baffle. The top of the piston assembly penetrates through the introduction cylinder baffle, and the top of the piston assembly is used to strike the sample within the growth cone. The bottom of the piston assembly extends out of the piston cylinder baffle, and the bottom of the piston assembly is in limit fit with the piston cylinder baffle;

[0012] The piston assembly is elastically connected to the introduction cylinder baffle.

[0013] Optionally, a central ring hole of the introduction cylinder baffle is provided in the middle of the introduction cylinder baffle, and a plurality of introduction cylinder baffle ventilation holes are provided on the introduction cylinder baffle at equal circumferential intervals.

[0014] Optionally, a central ring hole of the piston cylinder baffle is provided in the middle of the piston cylinder baffle, and a plurality of piston cylinder baffle ventilation holes are provided on the piston cylinder baffle at equal circumferential intervals.

[0015] Optionally, the piston assembly includes:

[0016] A connecting plate is disposed between the introduction cylinder baffle and the piston cylinder baffle, and the connecting plate is vertically slidably arranged with the introduction cylinder;

[0017] A jacking body is pivotally connected to the top of the connecting plate, and the top end of the jacking body penetrates through the introduction cylinder baffle through the central ring hole of the introduction cylinder baffle;

[0018] A piston column is pivotally connected to the bottom of the connecting plate, and the bottom end of the piston column penetrates through the piston cylinder baffle through the central ring hole of the piston cylinder baffle;

[0019] A piston handle is pivotally connected to the bottom of the piston column, and the piston handle is in limit fit with the piston cylinder baffle.

[0020] Optionally, a plurality of springs are provided between the connecting plate and the introduction cylinder baffle;

[0021] The plurality of springs are arranged at equal circumferential intervals. The top end of the spring is fixedly connected to the introduction cylinder baffle; the bottom end of the spring is fixedly connected to the connecting plate;

[0022] The top and bottom of the spring are respectively fixedly connected to the corresponding introduction cylinder baffle / connecting plate through spring hook holes.

[0023] Optionally, the introduction cylinder is made of a transparent material.

[0024] Optionally, the introduction cylinder is of an integral structure. The piston cylinder baffle is threadedly connected to the inner bottom of the introduction cylinder; the introduction cylinder baffle is threadedly connected to the middle of the inner side of the introduction cylinder.

[0025] Optionally, the introduction cylinder is of a split structure. The introduction cylinder includes an upper half introduction cylinder and a lower half introduction cylinder. The bottom of the lower half introduction cylinder is threadedly connected to the top of the piston cylinder baffle. The top of the lower half introduction cylinder is threadedly connected to the bottom of the introduction cylinder baffle. The bottom of the upper half introduction cylinder is threadedly connected to the top of the introduction cylinder baffle.

[0026] Optionally, the piston rod is threadedly fixed to the piston handle.

[0027] Optionally, the ejecting body is threadedly fixed to the connecting plate.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] During use, pull the bottom of the piston assembly to move the top of the piston assembly away from the introduction cylinder baffle. Subsequently, place the growth cone drill bit into the introduction cylinder, make the drill bit abut against the introduction cylinder baffle. After adjusting the angle of the drill bit, align the sample axis with the piston assembly axis. Release the bottom of the piston assembly. Under the elastic action of the piston assembly and the introduction cylinder baffle, the top of the piston assembly strikes the sample, loosening the sample from the inner wall of the growth cone drill bit, thereby facilitating the removal of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0031] Figure 1 is a sectional view of the structure of the present invention;

[0032] Figure 2 is a schematic diagram of the structure of the introduction cylinder baffle of the present invention;

[0033] Figure 3 is a schematic diagram of the structure of the piston cylinder baffle of the present invention;

[0034] Figure 4 is a schematic diagram of the structure of the piston assembly of the present invention;

[0035] Figure 5 [[ID=3,7]]is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0036] Figure 6 is a schematic diagram of the structure of Embodiment 2 of the present invention from another angle;

[0037] Figure 7 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0038] Among them, 1. Introduction cylinder; 2. Introduction cylinder baffle; 3. Piston assembly; 4. Piston cylinder baffle; 5. Ejector body; 6. Connecting plate; 7. Piston column; 8. Piston handle; 9. Spring; 10. Central ring hole of the introduction cylinder baffle; 11. Vent hole of the introduction cylinder baffle; 12. Central ring hole of the piston cylinder baffle; 13. Vent hole of the piston cylinder baffle; 14. Slide groove; 15. Retaining ring; 16. Connecting column; 17. Collar; 18. Set screw; 19. Core drilling ejector block; 20. Accommodating groove; 21. Ear plate one; 22. Ear plate two; 23. Binding strap; 24. Growth cone body; 25. Guide channel; 26. Ejector post. Detailed implementation manner

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0041] Embodiment 1:

[0042] Referring to Figures 1 to 4 , the present invention discloses a tree core ejecting device, including:

[0043] Introduction cylinder 1;

[0044] Introduction cylinder baffle 2, axially connected to the middle of the introduction cylinder 1;

[0045] Piston cylinder baffle 4, axially connected to the bottom of the introduction cylinder 1;

[0046] Piston assembly 3, vertically sliding in the introduction cylinder 1, the piston assembly 3 is arranged between the introduction cylinder baffle 2 and the piston cylinder baffle 4, the top of the piston assembly 3 penetrates through the introduction cylinder baffle 2, the top of the piston assembly 3 is used to strike the sample in the growth cone, the bottom of the piston assembly 3 extends out of the piston cylinder baffle 4, and the bottom of the piston assembly 3 is in limit fit with the piston cylinder baffle 4;

[0047] The piston assembly 3 is elastically connected to the introduction cylinder baffle 2.

[0048] During use, pull the bottom of the piston assembly 3 to move the top of the piston assembly 3 away from the inlet cylinder baffle 2. Then, place the growth cone drill bit into the inlet cylinder 1, make the drill bit abut against the inlet cylinder baffle 2. After adjusting the angle of the drill bit, align the sample axis with the axis of the piston assembly 3. Release the bottom of the piston assembly 3. Under the elastic action of the piston assembly 3 and the inlet cylinder baffle 2, the top of the piston assembly 3 strikes the sample, loosening the sample from the inner wall of the growth cone drill bit, thus facilitating the removal of the sample.

[0049] As an alternative embodiment, a central ring hole 10 of the inlet cylinder baffle 2 is provided in the middle, and a number of circumferentially equally spaced inlet cylinder baffle vent holes 11 are provided on the inlet cylinder baffle 2.

[0050] As an alternative embodiment, a central ring hole 12 of the piston cylinder baffle 4 is provided in the middle, and a number of circumferentially equally spaced piston cylinder baffle vent holes 13 are provided on the piston cylinder baffle 4.

[0051] As an alternative embodiment, the piston assembly 3 includes:

[0052] A connecting plate 6, arranged between the inlet cylinder baffle 2 and the piston cylinder baffle 4, and the connecting plate 6 is vertically slidably arranged with the inlet cylinder 1;

[0053] A jacking body 5, pivotally connected to the top of the connecting plate 6, and the top end of the jacking body 5 passes through the inlet cylinder baffle 2 through the central ring hole 10 of the inlet cylinder baffle;

[0054] A piston rod 7, pivotally connected to the bottom of the connecting plate 6, and the bottom end of the piston rod 7 passes through the piston cylinder baffle 4 through the central ring hole 12 of the piston cylinder baffle;

[0055] A piston handle 8, pivotally connected to the bottom of the piston rod 7, and the piston handle 8 is in limit fit with the piston cylinder baffle 4.

[0056] As an alternative embodiment, a number of springs 9 are provided between the connecting plate 6 and the inlet cylinder baffle 2;

[0057] A number of springs 9 are circumferentially equally spaced, the top end of the spring 9 is fixedly connected to the inlet cylinder baffle 2; the bottom end of the spring 9 is fixedly connected to the connecting plate 6;

[0058] The top and bottom of the spring 9 are respectively fixedly connected to the corresponding inlet cylinder baffle 2 / connecting plate 6 through spring through hook holes.

[0059] As an alternative embodiment, the inlet cylinder 1 is made of a transparent material.

[0060] As an alternative embodiment, the inlet cylinder 1 is of an integral structure, the piston cylinder baffle 4 is threadedly connected to the inner bottom of the inlet cylinder 1; the inlet cylinder baffle 2 is threadedly connected to the middle of the inner side of the inlet cylinder 1.

[0061] As an alternative embodiment, the introduction cylinder 1 has a split structure. The introduction cylinder 1 includes an upper half introduction cylinder and a lower half introduction cylinder. The bottom of the lower half introduction cylinder is threadedly connected to the top of the piston cylinder baffle 4, the top of the lower half introduction cylinder is threadedly connected to the bottom of the introduction cylinder baffle 2, and the bottom of the upper half introduction cylinder is threadedly connected to the top of the introduction cylinder baffle 2.

[0062] As an alternative embodiment, the piston rod 7 is fixedly connected to the piston handle 8 by threads.

[0063] As an alternative embodiment, the ejector body 5 and the connecting plate 6 are fixedly connected by threads.

[0064] This device is particularly suitable for the complete extraction of the core wood of high-hardness tree species.

[0065] The introduction cylinder baffle 2 is fixedly connected to the introduction cylinder 1. Spring hook holes are arranged at the bottom of the introduction cylinder baffle 2, and spring hook holes are arranged at the top of the connecting plate 6. Both ends of the spring 9 are respectively hooked into the spring hook holes of the connecting plate 6 and the introduction cylinder baffle 2.

[0066] The piston assembly 3 is divided into an ejector body 5, a connecting plate 6, a piston rod 7 and a piston handle 8. The ejector body 5 and the connecting plate 6 are spliced by threads. The connecting plate 6 and the piston rod 7 are of an integral structure. One end of the piston rod 7 away from the connecting plate 6 is connected to the piston handle 8 through a threaded structure. During use, by pulling the piston handle 8, the spring 9 between the connecting plate 6 and the introduction cylinder baffle 2 is further stretched to store energy in the spring. When the spring 9 is released, the ejector body 5 moves in a predetermined direction, thereby ejecting the tree core stuck in the growth cone opening.

[0067] The following is introduced in sequence according to the assembly process and the use process.

[0068] Device assembly process:

[0069] When the introduction cylinder 1 has a split structure, the introduction cylinder 1 is divided into an upper half introduction cylinder and a lower half introduction cylinder;

[0070] Threadedly connect the top of the introduction cylinder baffle 2 to the bottom of the upper half introduction cylinder;

[0071] Screw the threaded end of the ejector body 5 into the corresponding threaded hole of the connecting plate 6 to complete the rigid connection between the two;

[0072] Axially connect the connecting plate 6 and the piston rod 7; the connecting plate 6 and the piston rod 7 can be connected by threads, or the connecting plate 6 and the piston rod 7 can be set as an integral structure;

[0073] Hang the head end of the spring 9 on the preset hook hole of the introduction cylinder baffle 2 to ensure the firmness of the hanging;

[0074] Hang the tail end of the spring 9 on the corresponding hook hole of the piston connecting plate 6, and adjust the axis of the spring to be parallel to the center line of the introduction cylinder 1;

[0075] In the natural extended state of the spring 9, adjust the ejector body 5 so that its front end precisely passes through the central ring hole 10 of the guide cylinder baffle.

[0076] After the lower guide cylinder is sleeved outside the piston assembly 3, it is threadedly connected to the bottom of the guide cylinder baffle 2.

[0077] After the tail end of the piston column 7 passes through the central ring hole 12 of the piston cylinder baffle, the piston cylinder baffle 4 is threadedly connected to the lower guide cylinder.

[0078] Screw the piston handle 8 into the threaded interface at the tail end of the piston column 7 to complete the overall installation of the device.

[0079] Device operation method:

[0080] Insert the growth cone drill bit axially into the cavity of the guide cylinder 1.

[0081] Through the transparent guide cylinder 1, observe and adjust the drill bit angle in real time so that the axis of the stuck tree core coincides with the center of the front end of the ejector body 5.

[0082] Fine-tune the position of the drill bit to ensure that the edge of the cutting edge avoids the inner wall of the central ring hole 10 of the guide cylinder baffle to prevent damage to the cutting edge by scratching.

[0083] Make the cross-section of the tree core at the growth cone opening contact the front end of the ejector body 5, and gently press the ejector body 5 along the axis of the guide cylinder 1 to retract it to the guide cylinder baffle 2.

[0084] Grip the piston handle 8 and apply force steadily away from the cylinder body direction to stretch the spring 9, release the piston handle 8, and the elastic potential energy of the spring 9 drives the ejector body 5 to accelerate instantaneously. The impact force at the front end of the ejector body 5 acts on the stuck tree core directionally to achieve low-damage ejection. Among them, the stretching length of the spring 9 is tried from short to long and adjusted according to the ejection situation to avoid excessive impact damage to the tree core.

[0085] Example 2:

[0086] Reference Figures 5 to 6 , The difference between this embodiment and Embodiment 1 is that when the guide cylinder 1 is an integrally formed structure, symmetrically arranged sliding grooves 14 are provided on the guide cylinder 1. A connecting column 16 is slidably connected in the sliding grooves 14. One end of the connecting column 16 is fixedly connected to the side wall of the guide cylinder baffle 2. The ends of the two connecting columns 16 away from the guide cylinder baffle 2 are fixedly connected to the inner wall of a collar 17. A setscrew 18 is threadedly connected to the collar 17, and the setscrew 18 is pressed against the outer wall of the guide cylinder 1 to fix the guide cylinder baffle 2 to the guide cylinder 1;

[0087] A retaining ring 15 is in limit fit with the top of the guide cylinder baffle 2, and the retaining ring 15 is pivotally connected in the guide cylinder 1.

[0088] In use, by loosening the setscrew 18, the baffle 2 of the guiding cylinder can slide on the guiding cylinder 1 through the cooperation of the connecting column 16 and the sliding groove 14 to adjust the vertical position. Subsequently, by rotating the setscrew 18 to abut and press against the outer wall of the guiding cylinder 1, the baffle 2 of the guiding cylinder is fixed. By adjusting the position of the baffle 2 of the guiding cylinder on the guiding cylinder 1, the stretching degree of the spring 9 can be adjusted, and thus the striking force of the ejecting body 5 can be adjusted.

[0089] Embodiment 3:

[0090] Reference Figure 6 In this embodiment, the difference from Embodiment 1 is that the guiding cylinder 1 is placed in the core drilling top block 19 through the receiving groove 20. A guiding channel 25 for the growth cone body 24 to pass through is provided in the middle of the core drilling top block 19. Two symmetrically arranged top columns 26 are fixedly connected to one end of the core drilling top block 19 close to the tree. An ear plate one 21 is fixedly connected to one end of the core drilling top block 19, and an ear plate two 22 is fixedly connected to the other end of the core drilling top block 19. A through hole is provided on the ear plate one 21. One end of the binding band 23 passes through the through hole of the ear plate one 21, and the other end of the binding band 23 is in limit cooperation with the ear plate one 21. Two through holes are provided on the ear plate two 22, and one end of the binding band 23 far from the ear plate one 21 passes through the two through holes of the ear plate two 22 in sequence.

[0091] In use, the guiding cylinder 1 is placed in the core drilling top block 19 through the receiving groove 20, which is convenient for carrying. At the same time, during the core drilling sampling process, the core drilling top block 19 is abutted against one side of the tree through the top columns 26. Subsequently, after one end of the binding band 23 is in limit cooperation with the ear plate one 21, it is wound around the tree and then passes through the two through holes on the ear plate two 22, so that the binding band 23 is tightened with the tree. Since the length of the binding band 23 can be replaced, it is applicable to trees with different diameters. A guiding channel 25 is provided in the middle of the core drilling top block 19, and the growth cone body 24 drills the tree perpendicular to the stem direction through the guiding channel 25, which can prevent the problem of inaccurate sampling caused by the inclination of the direction during the drilling process. This device is both convenient for carrying and can effectively prevent loss by being placed in the core drilling top block 19.

[0092] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, 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, and therefore should not be construed as a limitation to the present invention.

[0093] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the design of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A core ejection device, characterized in that Comprising: An inlet cylinder (1); An inlet cylinder baffle (2), pivotally connected to the middle of the inlet cylinder (1); A piston cylinder baffle (4), pivotally connected to the bottom of the inlet cylinder (1); A piston assembly (3), vertically sliding within the inlet cylinder (1), the piston assembly (3) being disposed between the inlet cylinder baffle (2) and the piston cylinder baffle (4), the top of the piston assembly (3) passing through the inlet cylinder baffle (2), the top of the piston assembly (3) being used to strike the sample within the growth cone, the bottom of the piston assembly (3) extending out of the piston cylinder baffle (4), and the bottom of the piston assembly (3) being in limit fit with the piston cylinder baffle (4); The piston assembly (3) is elastically connected to the inlet cylinder baffle (2).

2. The core ejection device according to claim 1, characterized in that: A central ring hole (10) of the inlet cylinder baffle is provided in the middle of the inlet cylinder baffle (2), and a plurality of inlet cylinder baffle ventilation holes (11) are provided on the inlet cylinder baffle (2) at equal circumferential intervals.

3. The core ejecting device according to claim 2, characterized in that: A central ring hole (12) of the piston cylinder baffle is provided in the middle of the piston cylinder baffle (4), and a plurality of piston cylinder baffle ventilation holes (13) are provided on the piston cylinder baffle (4) at equal circumferential intervals.

4. A core ejecting device according to claim 3, characterized in that: The piston assembly (3) includes: A connecting plate (6), disposed between the inlet cylinder baffle (2) and the piston cylinder baffle (4), the connecting plate (6) being vertically slidably disposed with the inlet cylinder (1); A jacking body (5), pivotally connected to the top of the connecting plate (6), the top end of the jacking body (5) passing through the inlet cylinder baffle (2) through the central ring hole (10) of the inlet cylinder baffle; A piston column (7), pivotally connected to the bottom of the connecting plate (6), the bottom end of the piston column (7) passing through the piston cylinder baffle (4) through the central ring hole (12) of the piston cylinder baffle; A piston handle (8), pivotally connected to the bottom of the piston column (7), the piston handle (8) being in limit fit with the piston cylinder baffle (4).

5. The core ejecting device according to claim 4, characterized in that: A plurality of springs (9) are provided between the connecting plate (6) and the inlet cylinder baffle (2); The plurality of springs (9) are circumferentially arranged at equal intervals, the top end of the spring (9) being fixedly connected to the inlet cylinder baffle (2); the bottom end of the spring (9) being fixedly connected to the connecting plate (6); The top and bottom of the spring (9) are respectively fixedly connected to the corresponding inlet cylinder baffle (2) / connecting plate (6) through spring hook holes.

6. The core ejection device according to claim 1, characterized in that: The inlet cylinder (1) is made of a transparent material.

7. A core ejecting device according to claim 4, wherein: The inlet cylinder (1) is of an integral structure, and the piston cylinder baffle (4) is threadedly connected to the inner bottom of the inlet cylinder (1); the inlet cylinder baffle (2) is threadedly connected to the inner middle of the inlet cylinder (1).

8. A core ejecting device according to claim 4, characterized in that: The inlet cylinder (1) is of a split structure, the inlet cylinder (1) includes an upper half inlet cylinder and a lower half inlet cylinder, the bottom of the lower half inlet cylinder is threadedly connected to the top of the piston cylinder baffle (4), the top of the lower half inlet cylinder is threadedly connected to the bottom of the inlet cylinder baffle (2), and the bottom of the upper half inlet cylinder is threadedly connected to the top of the inlet cylinder baffle (2).

9. The core ejecting device according to claim 4, characterized in that: The piston column (7) is fixedly connected to the piston handle (8) by threads.

10. A core ejecting device according to claim 4, characterized in that: The ejector body (5) and the connecting plate (6) are fixed by threading.

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