Discharge port switching structure in soil additive dispensing device

Abstract

Compared to conventional technology, this technology suppresses damage to the clutch in the soil additive dispensing device and also suppresses dust from entering the inside of the clutch. [Solution] The first clutch portion comprises a first non-contact portion and a protruding portion, and the second clutch portion comprises a notch portion that receives the protruding portion so as to be rotatable around a longitudinal axis and the protruding portion contacts the end face of the notch portion corresponding to the first rotation position and the second rotation position, respectively, and a second non-contact portion, wherein the longitudinal contact width dimension of the protruding portion is set to be smaller than the longitudinal non-contact width dimension of the first non-contact portion, and the longitudinal contact width dimension of the notch portion is set to be smaller than the non-contact width dimension of the second non-contact portion, and the second non-contact portion is provided with a dust seal to seal the gap between it and the inner shaft and suppress the mixing of dust, which is a discharge port switching structure for a soil additive discharge device.

Description

Technical Field

[0001] The present invention relates to a discharge port switching structure in a soil additive discharge device.

Background Art

[0002] Patent Document 1 (Japanese Patent No. 4125310) describes an invention related to a soil additive discharge device that enables efficient addition of an additive to soil when advancing or retreating in the soil.

[0003] In this soil additive discharge device, two discharge ports for adding the additive to the soil are provided. The switching of the discharge port is performed by rotating until a protrusion provided on the inner shaft contacts the end face of a notch provided on the outer shaft.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since the switching of the discharge port is performed by rotating until a protrusion provided on the inner shaft contacts the end face of a notch provided on the outer shaft, there is a risk that the clutch part may be damaged, such as cracked or deformed, due to the impact when the protrusion contacts the end face of the notch. In addition, dust such as fine sand and iron powder may enter the inside of the clutch part through the gap between the protrusion and the notch, making it difficult to switch the discharge port due to the rotation of the clutch part.

[0006]

[0007] ​The present invention aims to suppress damage to the clutch portion of a soil additive dispensing device and to suppress dust from entering the inside of the clutch portion, compared to the conventional technology. [Means for solving the problem]

[0008] The first embodiment comprises an internal channel for circulating an additive to be added to the soil, a first internal discharge port and a second internal discharge port formed at different rotational positions communicating with the internal channel, an internal shaft comprising a first clutch portion, a hollow portion into which the internal shaft is fitted, a first external discharge port and a second external discharge port formed to communicate with the first internal discharge port and the second internal discharge port, and a second clutch formed to engage with the first clutch portion. Department The clutch unit comprises an outer shaft, the inner shaft, which is configured such that the first inner discharge port communicates with the first outer discharge port when the inner shaft is rotated so as to be positioned in a first rotation position around its longitudinal axis, and the second inner discharge port communicates with the second outer discharge port when the inner shaft is rotated so as to be positioned in a second rotation position around its longitudinal axis, the first clutch unit comprises a first non-contact portion and a protruding portion, and the second clutch unit is configured such that the protruding portion is rotatably received around its longitudinal axis The discharge port switching structure for a soil additive discharge device comprises a notch portion in which the protruding portion contacts the end face of the notch portion corresponding to the first rotation position and the second rotation position, respectively, and a second non-contact portion, wherein the ratio D11 / D12 of the longitudinal contact width dimension D11 of the protruding portion to the longitudinal non-contact width dimension D12 of the first non-contact portion is set to 4 / 3 or less, and the ratio D21 / D22 of the longitudinal contact width dimension D21 of the notch portion to the longitudinal non-contact width dimension D22 of the second non-contact portion is set to 4 / 3 or less, and the second non-contact portion is provided with a dust seal to seal the gap between it and the inner shaft and suppress the mixing of dust.

[0009] That is the case.

[0010] The second embodiment is a discharge port switching structure for a soil additive discharge device, wherein, in the first embodiment, the ratio D11 / D12 of the longitudinal contact width dimension D11 of the protruding portion to the longitudinal non-contact width dimension D12 of the first non-contact portion is 1 / 5 or more, and the ratio D21 / D22 of the longitudinal contact width dimension D21 of the notched portion to the longitudinal non-contact width dimension D22 of the second non-contact portion is 1 / 5 or more.

[0011] A third embodiment is a discharge port switching structure for a soil additive discharge device, wherein, in the first embodiment, the dust seal is provided on the side of the second non-contact portion closer to the first clutch portion, and at least one O-ring is provided on the side further away from the first clutch portion. [Effects of the Invention]

[0012] According to the first to third embodiments, compared to the conventional technology, damage to the clutch portion of the soil additive dispensing device can be suppressed, and dust can be suppressed from entering the inside of the clutch portion. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a front view of a soil additive dispensing device according to an embodiment. [Figure 2] Figure 2 is a right side view of a soil additive dispensing device according to an embodiment. This is a right side view showing the device. [Figure 3A] This is a diagram showing the first movement position, and is an end view AA of Figure 1. [Figure 3B] This is a diagram showing the first movement position, and is an end view of BB in Figure 1. [Figure 3C] This is a diagram showing the first movement position and is a CC end view of Figure 1. [Figure 4A] This is a diagram showing the second movement position, and is an end view AA of Figure 1. [Figure 4B] This is a diagram showing the second movement position, and is an end view of BB in Figure 1. [Figure 4C] This is a diagram showing the second movement position, and is a CC end view of Figure 1. [Figure 5A] FIG. 5A is a diagram for explaining the components of the clutch portion taken out from the inner shaft and the outer shaft. [Figure 5B] FIG. 5B is a diagram for explaining the components of the clutch portion taken out from the inner shaft and the outer shaft. [Figure 5C] FIG. 5C is a diagram for explaining the components of the clutch portion taken out from the inner shaft and the outer shaft. [Figure 6] FIG. 6(A) is a diagram illustrating a cross section of the outer shaft, and FIG. 6(B) is a diagram showing an enlarged view of a portion A surrounded by a broken line in FIG. 6(A).

Embodiments for Carrying out the Invention

[0014] Hereinafter, embodiments of a discharge port switching structure in a soil additive discharge device according to the present invention will be described with reference to the drawings.

[0015] (Overall Configuration of Soil Additive Discharge Device)

[0016] FIG. 1 is a front view of a soil additive discharge device 100 according to an embodiment. FIG. 2 is a right side view of the soil additive discharge device 100 according to the embodiment.

[0017] In FIGS. 1 and 2, in the drawing, the upper side is referred to as the proximal end side, and the lower side is referred to as the distal end side. In FIGS. 1 and 2, the direction connecting the upper and lower sides (vertical axis direction) in the drawing is referred to as the longitudinal direction.

[0018] The soil additive discharge device 100 generally includes an inner shaft 110, an outer shaft 120, a clutch portion 200, a proximal end side stirring blade 130, a distal end side stirring blade 140, a freely rotatable blade 150, a freely rotatable blade support portion 160, and a digging blade 170.

[0019] An attachment of a construction machine (not shown) that rotationally drives the soil additive discharge device 100 around the vertical axis C is connected to a connection portion 111 on the proximal end side of the inner shaft 110.

[0020] The inner shaft 110 is formed in a generally cylindrical shape. The inner shaft 110 is fitted into the outer shaft 120.

[0021] The clutch section 200 is composed of a first clutch section 210 and a second clutch section 220. The clutch section 200 engages at engagement positions corresponding to the first rotation position and the second rotation position, respectively.

[0022] The first clutch portion 210 is provided on the inner shaft 110. The first clutch portion 210 is configured to have a larger diameter than the inner shaft 110.

[0023] The second clutch section 220 is provided on the outer shaft 120. The second clutch section 220 is configured to have a larger diameter than the outer shaft 120.

[0024] The internal shaft 110 can be rotated so as to be positioned at a first rotation position and a second rotation position around the longitudinal axis C.

[0025] The base-side stirring blade 130 is located further towards the tip of the outer shaft 120 than the position where the clutch section 200 is installed. The base-side stirring blade 130 extends horizontally from the outer surface of the outer shaft 120.

[0026] The tip-side stirring blade 140 is positioned further towards the tip of the outer shaft 120 than the position where the base-side stirring blade 130 is located. The tip-side stirring blade 140 extends horizontally from the outer surface of the outer shaft 120.

[0027] The free-rotating blade support section 160 is located further towards the tip of the outer shaft 120 than the position where the tip-side stirring blade 140 is installed, and is rotatably fitted onto the outer shaft 120. The free-rotating blade support section 160 supports the free-rotating blade 150. The free-rotating blade 150 extends horizontally from the outer surface of the free-rotating blade support section 160.

[0028] The drilling blade 170 is positioned further towards the tip of the outer shaft 120 than the position where the free-rotating blade 150 (free-rotating blade support section 160) is located. The drilling blade 170 extends horizontally from the outer surface of the outer shaft 120.

[0029] A first external discharge port 121 is formed near the tip of the outer shaft 120, in the vicinity of the installation position of the drilling blade 170. The first external discharge port 121 penetrates the wall surface of the outer shaft 120, connecting the outside and inside of the outer shaft 120.

[0030] A second external discharge port 122 is formed on the base end of the outer shaft 120, near the location where the base end stirring blade 130 is installed. The second external discharge port 122 penetrates the wall of the outer shaft 120, connecting the outside and inside of the outer shaft 120.

[0031] Figures 3A, 3B, and 3C show the AA, BB, and CC cross-sections of Figures 1 and 2, respectively. Figures 3A, 3B, and 3C show the clutch unit 200 engaged in the first rotation position.

[0032] Figures 4A, 4B, and 4C show cross-sections AA, BB, and CC of Figures 1 and 2, respectively. Figures 4A, 4B, and 4C show the clutch section 200 engaged in the second rotation position.

[0033] (Internal shaft)

[0034] As illustrated in Figures 3A, 3B, and 3C, the internal shaft 110 is composed of an internal flow path 110F for circulating additives added to the soil, a first internal discharge port 111 and a second internal discharge port 112 formed at different rotational positions that communicate with the internal flow path 111, and a first clutch portion 210.

[0035] (External shaft)

[0036] As illustrated in Figures 3A, 3B, and 3C, the outer shaft 120 is composed of a hollow portion 110E into which the inner shaft 110 is fitted, a first outer outlet 121 and a second outer outlet 122 formed to communicate with the first inner outlet 111 and the second inner outlet 112, respectively, and a second clutch 220 formed to engage with the first clutch portion 210.

[0037] As shown in Figures 3A and 3C, the inner shaft 110 rotates around the longitudinal axis C to position it in the first rotation position, thereby connecting the first inner discharge port 111 to the first outer discharge port 121. At this time, as shown in Figure 3B, communication between the second inner discharge port 112 and the second outer discharge port 122 is blocked. Also, as shown in Figures 4A and 4B, the inner shaft 110 rotates around the longitudinal axis C to position it in the second rotation position, thereby connecting the second inner discharge port 112 to the second outer discharge port 122. At this time, as shown in Figure 4C, communication between the first inner discharge port 111 and the first outer discharge port 121 is blocked.

[0038] Figures 5A, 5B, and 5C are diagrams illustrating the components of the clutch unit 200 separated from the inner shaft 110 and outer shaft 120, respectively.

[0039] Figure 5A is a perspective view showing the first clutch section 210 and the second clutch section 220 separated. Figure 5B is a cross-sectional view showing the engaged state of the first clutch section 210 and the second clutch section 220. Figure 5C is a cross-sectional view of the first clutch section 210 and the second clutch section 220, respectively.

[0040] (Clutch section)

[0041] The first clutch portion 210 includes a first non-contact portion 212 and a protruding portion 211.

[0042] The second clutch portion 220 receives the projection 212 so as to be rotatable around the longitudinal axis C, and includes a notch 221 that contacts the projection 211 at the notch end faces 221A and 221B corresponding to the first rotation position and the second rotation position, respectively, and a second non-contact portion 222.

[0043] Here, the ratio D11 / D12 of the longitudinal contact width dimension D11 of the protruding portion 211 to the longitudinal non-contact width dimension D12 of the first non-contact portion 212 is set to 4 / 3 or less.

[0044] Furthermore, the ratio D21 / D22 of the longitudinal contact width dimension D21 of the notch 221 to the longitudinal non-contact width dimension D22 of the second non-contact portion 222 is set to 4 / 3 or less.

[0045] In other words, according to the verification results by the inventors, it was confirmed that in the case of a low-torque type soil additive dispensing device 100, damage to the clutch section 200 does not occur as long as the ratios D11 / D12 and D21 / D22 do not exceed 4 / 3.

[0046] Preferably, the ratio D11 / D12 of the longitudinal contact width dimension D11 of the projection 211 to the longitudinal non-contact width dimension D12 of the first non-contact portion 212 is set to 4 / 3 or less and 1 / 5 or more.

[0047] Preferably, the ratio D21 / D22 of the longitudinal contact width dimension D21 of the notch 221 to the longitudinal non-contact width dimension D22 of the second non-contact portion 222 is set to 4 / 3 or less and 1 / 5 or more.

[0048] In other words, according to the inventors' verification results, the higher the torque of the soil additive dispensing device 100, the more it is necessary to gradually set the ratios D11 / D12 and D21 / D22 from 4 / 3 to smaller values ​​in order to prevent damage to the clutch section 200. It was confirmed that even with very high torque, if the ratios D11 / D12 and D21 / D22 are set to 1 / 5, damage to the clutch section 200 will not occur.

[0049] The second non-contact portion 222 is provided with a dust seal 223 to seal the gap between it and the inner shaft 210 and to suppress the ingress of dust.

[0050] For example, a dust seal 223 is provided on the side of the second non-contact portion 222 that is closer to the first clutch portion 210, and at least one O-ring 300 is provided on the side of the second non-contact portion 222 that is further away from the first clutch portion 210.

[0051] (Example 1)

[0052] The longitudinal non-contact width dimension D12 of the first non-contact portion 212 is set to 70 mm, and the longitudinal contact width dimension D11 of the protruding portion 211 is set to 30 mm.

[0053] Furthermore, the longitudinal non-contact width dimension D22 of the second non-contact portion 222 is set to 70 mm, and the longitudinal contact width dimension D21 of the notch portion 221 is set to 30 mm.

[0054] The ratios D11 / D12 and D21 / D22 are set to 3 / 7, and the ratios D11 / D12 and D21 / D22 are within the range of 4 / 3 or less and 1 / 5 or more. Therefore, no damage occurs to the clutch section 200.

[0055] As shown in Figures 5B and 5C, a dust seal 223 is provided on the side of the second non-contact portion 222 that is closer to the first clutch portion 210, and at least one O-ring 300 is provided on the side of the second non-contact portion 222 that is further away from the first clutch portion 210.

[0056] Since the second non-contact portion 222 is set to 70 mm, the dust seal 223 and at least one O-ring 300, preferably two O-rings 300, can be sequentially arranged along the longitudinal direction of the second non-contact portion 222, from the base end to the tip end.

[0057] Since a dust seal 223 is provided on the side of the second non-contact portion 222 closest to the first clutch portion 210, dust such as fine sand and iron powder is prevented from entering the inside of the clutch portion 200 through the gap between the protruding portion 211 and the notched portion 221. This prevents difficulty in switching the discharge port by rotating the clutch portion 200.

[0058] Furthermore, at least one O-ring 300, preferably two O-rings 300, is positioned on the side of the second non-contact portion 222 that is furthest from the first clutch portion 210. This prevents the additive from entering the gap between the inner shaft 110 and the outer shaft 120 from the first inner outlet 111 or the first outer outlet 121 or the second inner outlet 112 or the second outer outlet 122.

[0059] Furthermore, the dust seal 223 prevents dust from entering the gap between the inner shaft 110 and the outer shaft 120. This reduces damage to the O-ring 300.

[0060] (Example 2)

[0061] In Example 1, the longitudinal non-contact width dimension D22 of the second non-contact portion 222 may be changed from 70 mm to 80 mm. The same effect as in Example 1 can be obtained in Example 2.

[0062] (Example 3)

[0063] The longitudinal non-contact width dimension D12 of the first non-contact portion 212 is set to 30 mm, and the longitudinal contact width dimension D11 of the protruding portion 211 is set to 40 mm.

[0064] Furthermore, the longitudinal non-contact width dimension D22 of the second non-contact portion 222 is set to 30 mm, and the longitudinal contact width dimension D21 of the notch portion 221 is set to 40 mm.

[0065] The ratios D11 / D12 and D21 / D22 are each set to 4 / 3, and the ratios D11 / D12 and D21 / D22 are each within the range of 4 / 3 or less and 1 / 5 or more. Therefore, no damage occurs to the clutch section 200.

[0066] Figure 6(A) is a diagram illustrating a cross-section of the outer shaft 210. Figure 6(B) is a diagram illustrating a cross-section of Figure 6(A). This is a diagram showing a magnified view of part A, which is enclosed by a dashed line.

[0067] As shown in Figures 6(A) and (B), the base end of the outer shaft 210 has a second clutch section 2 20 is provided.

[0068] A dust seal 223 is provided in the second non-contact portion 222 of the second clutch portion 220.

[0069] On the outer shaft 210, O-rings 301, 302, 303, 304, 305, and 306 are arranged sequentially from the base end to the tip end along the longitudinal direction.

[0070] O-rings 301, 302, and 303 are positioned to sandwich the second external discharge port 122. O-rings 304 and 305, and O-ring 306 are positioned to sandwich the first external discharge port 121. This prevents the additive from entering the gap between the inner shaft 110 and the outer shaft 120 through the first internal discharge port 111 to the first external discharge port 121 or the second internal discharge port 112 to the second external discharge port 122.

[0071] Furthermore, the dust seal 223 prevents dust from entering the gap between the inner shaft 110 and the outer shaft 120. This reduces damage to the O-rings 301 to 306 caused by dust intrusion. [Explanation of Symbols]

[0072] 110 Inner shaft 120 External shaft 200 Clutch section 210 First clutch section 220 Second clutch section 211 Protrusion 212 First non-contact part 221 Notch 222 Second non-contact part 223 Dust Seal 300, 301-306 O-rings

Claims

1. An internal channel for circulating additives to be added to the soil, a first internal discharge port and a second internal discharge port formed at different rotational positions communicating with the internal channel, and an internal shaft comprising a first clutch section, An outer shaft comprising a hollow portion into which the inner shaft is fitted, a first outer discharge port and a second outer discharge port formed to communicate with the first inner discharge port and the second inner discharge port, respectively, and a second clutch formed to engage with the first clutch portion, Equipped with, The internal shaft is configured to rotate so as to be positioned in a first rotational position around its longitudinal axis, thereby connecting the first internal discharge port to the first external discharge port, and the internal shaft is configured to rotate so as to be positioned in a second rotational position around its longitudinal axis, thereby connecting the second internal discharge port to the second external discharge port. The first clutch portion comprises a first non-contact portion and a protruding portion, The second clutch portion receives the protruding portion so as to be rotatable around its longitudinal axis, and includes a notch portion in which the protruding portion contacts the end face of the notch portion corresponding to the first rotation position and the second rotation position, respectively, and a second non-contact portion. The ratio D11 / D12 of the longitudinal contact width dimension D11 of the protruding portion to the longitudinal non-contact width dimension D12 of the first non-contact portion is set to 4 / 3 or less, The ratio D21 / D22 of the longitudinal contact width dimension D21 of the notch to the longitudinal non-contact width dimension D22 of the second non-contact portion is set to 4 / 3 or less. The second non-contact portion is provided with a dust seal to seal the gap between it and the inner shaft and to suppress the ingress of dust. Discharge port switching structure in a soil additive dispensing device.

2. The ratio D11 / D12 of the longitudinal contact width dimension D11 of the protruding portion to the longitudinal non-contact width dimension D12 of the first non-contact portion is 1 / 5 or more. The ratio D21 / D22 of the longitudinal contact width dimension D21 of the notch to the longitudinal non-contact width dimension D22 of the second non-contact portion is 1 / 5 or more. Discharge port switching structure in a soil additive dispensing device according to claim 1.

3. Of the second non-contact portion, the dust seal is provided on the side closer to the first clutch portion, and at least one O-ring is provided on the side further away from the first clutch portion. Discharge port switching structure in a soil additive dispensing device according to claim 1.

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