Fish body scale removal device

Abstract

To provide a fish scaling device for fish body capable of efficiently and reliably removing all scales by evenly and repeatedly jetting high pressure water to all scales on the surface of the fish body.SOLUTION: A fish scaling device for fish body includes: conveyor means; and pressurized water jet means which jets high-pressure water to the surface of a fish body passing respective gaps for jetting pressurized water to the gaps for jetting pressurized water provided between endless belts of the conveyor means and removing scales of the fish body. The pressurized water jet means is provided with pressurized water jet nozzles which moves to columns of scales in a width direction of the fish body at high speed and removes scales of the fish body while the scales arranged in parallel in the width direction of the fish body are transported just for a distance equivalent to the length of the scales.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fish scale removing device that removes scales from fish bodies by spraying pressurized water onto the fish bodies being transported by a conveyor means. [Background technology]

[0002] Conventionally, devices for removing scales from fish bodies by jetting water are described in, for example, Patent Documents 1 and 2.

[0003] The fish scale removing machine described in Patent Document 1 above has conveyors consisting of upper and lower transport belts that clamp and transport the fish on the upstream and downstream sides of the fish transport path, and a conveyor means is provided between the upstream and downstream conveyor parts of one or both of the conveyors, providing a gap through which the fish are exposed during transport.The machine is also equipped with water injection means consisting of a plurality of water injection nozzles that spray water onto the surface of the fish in the gap of the conveyor means to remove the scales of the fish.

[0004] This water injection means is disposed across the gap and is attached to a sliding member supported so as to be freely slidable across the rotating shafts of the conveyor parts on both sides of the gap, and is configured to remove scales by spraying low water pressure from the water injection nozzle while maintaining an approximately constant distance between the tip of the water injection nozzle and the surface of the fish body.

[0005] In this case, the water jet nozzle is configured with two rows of nozzles, and the water jetted from the first row of water jet nozzles stands up the scales on the fish body, and the water jetted from the second row of water jet nozzles removes the scales.

[0006] On the other hand, the hydraulic scale removing device described in Patent Document 2 above is equipped with an upper and lower conveying device that moves horizontally in a circular motion from the upstream side to the downstream side while clamping the fish body, and spray nozzles fixedly positioned on both the left and right sides above the upper conveying device and on both the left and right sides below the lower conveying device of this upper and lower conveying device.

[0007] The above-mentioned upper and lower conveying devices have sprockets attached to the left and right ends of sprocket shafts arranged to rotate freely on the upstream and downstream sides, with endless chains stretched between the opposing right-end sprockets and left-end sprockets, and cross wires attached between each link of these left and right endless chains. Furthermore, in the lower conveying device, endless ropes perpendicular to the cross wires are stretched endlessly between the sprocket shafts at predetermined intervals in the left-right direction, and these endless ropes and the cross wires form a multiple lattice mesh-like space when viewed in a plane.

[0008] A fish transport surface is formed by a plurality of horizontal wires stretched across the upper transport device and a lattice net made up of horizontal wires and endless ropes provided on the lower transport device, which clamps and transports the fish.

[0009] Electric motors are fixedly positioned on both the left and right sides of the fish transport surface, above and below, and one end of a swivel arm is attached to the output shaft of each electric motor. The other end (free end) of the swivel arm has the above-mentioned spray nozzle inclined at a predetermined angle from the outside in the left-right direction toward the center relative to the fish transport surface, and is also inclined at a predetermined angle in the direction toward the leading side of the transport direction relative to the fish transport surface. While the swivel arm is rotated, pressurized water is sprayed from the spray nozzle toward the fish to remove the scales. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2011-83250 A [Patent Document 2] JP 2012-165721 A Summary of the Invention [Problem to be solved by the invention]

[0011] According to the fish scale removing device described in Patent Document 1 above, when removing scales from a fish, there is little variation in the distance between the tip of the water injection nozzle and the surface of the fish, making it possible to remove the scales with a low water pressure jet of water. However, because the water injection device has multiple injection nozzles in the width direction (dorsal-ventral direction) of the fish transported by the conveyor means, not only does it require a relatively large pump to supply pressurized water to these multiple injection nozzles, but it is also difficult to completely remove the scales from the fish with low water pressure jets, so it is necessary to provide two rows of injection nozzles spaced apart in the direction the fish is transported, and use the water jet from the first row of injection nozzles to raise the scales on the surface of the fish, and then use the water jet from the next row of injection nozzles to remove these raised scales. This not only complicates the structure of the water injection means, but also poses the problem that the scale removal processing capacity is reduced when low pressure water is sprayed.

[0012] Furthermore, all of the water injection nozzles of the water injection means are configured to always spray water toward a fixed location without varying the direction of water injection into the gaps in the conveyor means, whereas the arrangement of scales on the fish bodies transported by the conveyor means varies depending on their size and type, and so the water injected from the water injection nozzles cannot be concentrated on the parts of the fish body where the scales are most effectively removed. This can result in the water not being able to be injected into parts that are difficult to remove, making it difficult to remove the scales and there is a risk that some scales will not be removed and remain on the surface of the fish body.

[0013] On the other hand, according to the hydraulic scale removal device described in Patent Document 2, high-pressure water is sprayed from an injection nozzle onto the surface of the fish body held and transported by the upper and lower conveying devices, so that the scales of the fish body can be quickly removed by the injection pressure of the high-pressure water. However, since the high-pressure water from the injection nozzle is sprayed onto the surface of the fish body held by the fish transport surfaces of the upper and lower conveying devices, which move in a circulating manner without being supported, not only does some of the pressurized water hit and disperse on the horizontal wires and endless ropes that make up the upper and lower conveying devices, but it also creates the problem that it is difficult to peel off and remove the scales from the fish body because some of the scales of the fish are clamped by the horizontal wires that make up the upper and lower conveying devices.

[0014] In addition, the spray nozzle which sprays pressurized water onto the surface of the fish is attached to one end of a swivel arm which has one end fixed to the output shaft of the electric motor, and is inclined at a predetermined angle from the outside in the left-right direction toward the center relative to the fish transport surface, and is also inclined at a predetermined angle toward the forward direction of the transport relative to the fish transport surface.Therefore, the spray nozzle directed toward the surface of the fish moves in a circular motion around the scales, causing the spray pressure acting on the scales to fluctuate, resulting in the problem that it is not possible to efficiently peel off all of the scales with uniform high-pressure water.

[0015] This problem occurs even if the injection nozzle described in Patent Document 2 is disposed above the gap provided between the upstream conveyor portion and the downstream conveyor portion described in Patent Document 1 above.

[0016] The present invention has been made in consideration of such problems, and its object is to provide a fish scale removing device which can efficiently and reliably remove all scales on the surface of a fish by spraying high-pressure water evenly and several times onto all scales on the surface of the fish. [Means for solving the problem]

[0017] The fish scale removing device of the present invention comprises: A conveyor means including a first endless belt and a second endless belt, the opposing surfaces of which form a fish holding and conveying surface; a pressurized water jetting means for jetting high pressure water onto a surface of the fish body transported on the transport path of the fish body in the conveyor means to remove the scales of the fish body, The pressurized water injection means is characterized in that it is equipped with a pressurized water injection nozzle which moves at high speed across the width of the fish body several times over the row of scales arranged in a row across the width of the fish body to remove the scales from the fish body while the scales are transported a distance equivalent to the length of the scales.

[0018] In the fish body scale removing device, The first endless belt includes a first upstream endless belt and a first downstream endless belt, and a gap for jetting pressurized water is provided between the first upstream endless belt and the first downstream endless belt in the transport path of the fish body; The pressurized water jetting means is configured to jet high pressure water toward the pressurized water jetting gap and onto the surface of the fish body passing through the pressurized water jetting gap.

[0019] In the fish scale removing device, The pressure water injection means is A cylindrical fixed nozzle housing having a part of its outer circumferential surface facing the pressure water injection gap; A long hole opening toward the fish body on a part of the outer peripheral surface of the fixed nozzle outer casing; a pressure water receiving cylinder rotatably disposed within the fixed nozzle housing and connected to a pressure water supply pipe; a pressurized water injection nozzle that is connected to and supported by the pressurized water receiving cylinder, has a tip facing the long hole, and rotates at high speed within the fixed nozzle housing together with the pressurized water receiving cylinder by the injection pressure of pressurized water injected from the tip. Effect of the Invention

[0020] The pressurized water injection means of the fish scale removal device of the present invention has a pressurized water injection nozzle that injects high-pressure water toward the surface of the fish body being transported on the fish transport path within the fish body transport path, thereby removing the scales from the surface of the fish body.The pressurized water injection nozzle is configured to move at high speed in the width direction of the fish body several times relative to the row of scales arranged in parallel in the width direction (dorsal-ventral direction) of the fish body while the scales are transported a distance equivalent to the length of the scales (head-to-tail direction).This allows high-pressure water to be sprayed evenly onto all of the scales several times, and this high-pressure water quickly stands the scales up and at the same time instantly peels them off from the base, allowing the scales on the surface of the fish body to be removed efficiently and reliably.

[0021] In the fish scale removing device described above, a pressurized water receiving cylinder is rotatably disposed within a fixed nozzle outer casing having a long hole opening toward the fish transport path of the conveyor means, and pressurized water is supplied to this pressurized water receiving cylinder from a pressure water supply pipe of an external piping. In this case, the pressurized water jet nozzle is rotated at high speed within the fixed nozzle outer casing together with the pressurized water receiving cylinder by the high-pressure water jet reaction force from the pressurized water jet nozzle connected to the pressure water supply pipe, and when the pressurized water jet nozzle faces the long hole opening into part of the outer circumferential surface of the fixed nozzle outer casing, it sprays pressurized water onto the surface of the fish through this long hole. In this case, no separate rotation drive device is required for the pressurized water jet nozzle, and the pressurized water can be rotated at high speed in the circumferential direction within the fixed nozzle casing by the jet pressure from the pressurized water jet nozzle. High-pressure water other than the high-pressure water jetted from the long hole opening toward the fish transport path of the conveyor means is not scattered to the outside, but is made to collide with the inner circumferential surface of the fixed nozzle outer casing and can be discharged from the fixed nozzle outer casing through the long hole or an appropriate drainage hole to the outside.

[0022] Furthermore, by varying the pressure of the high pressure water sprayed from the pressurized water spray nozzle, the rotation speed of the pressurized water spray nozzle can be varied, and adjustments can be made so that scales on the surface of the fish can be removed efficiently and reliably depending on the type of fish. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a simplified side view of the fish scale removing device of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a simplified side view showing the fish scale removing device in use. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] A schematic diagram showing the removal of fish scales using pressurized water. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An example of a fish scale removing device of the present invention will be described with reference to the drawings. As shown in Figures 1 to 4, the fish scale removing device includes conveyor means 1 that holds fish body A and transports it from upstream to downstream, and pressurized water injection means 7, 7 that inject high pressure water W onto the surface of fish body A transported by conveyor means 1 to remove scales from the surface of fish body A.

[0025] The conveyor means 1 includes a first endless belt 2 and a second endless belt 3. The first endless belt 2 includes a first upstream endless belt 2a and a first downstream endless belt 3a, while the second endless belt 3 includes a second upstream endless belt 2b and a second downstream endless belt 3b, and the opposing surfaces of the first upstream endless belt 2a, the first downstream endless belt 3a, the second upstream endless belt 2b and the second downstream endless belt 3b are formed into fish body clamping and conveying surfaces 4, 4 that clamp and convey the fish A.

[0026] The first endless belt 2 and the second endless belt 3 constituting the conveyor means 1, for example, the first upstream endless belt 2a provided on the upstream side, is endlessly stretched around a driving pulley 4a and a driven pulley 2a2, and is provided with a tension pulley 2a3 and a clamping pulley 2a4.

[0027] Similarly, the other endless belts 2b, 3a, and 3b are also endlessly stretched between a driving pulley and a driven pulley, and have tension pulleys and pressure pulleys. Note that this type of configuration is well known, so detailed description will be omitted.

[0028] Furthermore, a pressurized water injection gap 5 having a predetermined distance is provided between the first upstream endless belt 2a and the first downstream endless belt 3a, more specifically, between the opposing pulleys that respectively span the first upstream endless belt 2a and the first downstream endless belt 3a.

[0029] Similarly, a pressurized water injection gap 6 having a predetermined distance is provided between the second upstream endless belt 2b and the second downstream endless belt 3b, more specifically, between the opposing pulleys that respectively span the second upstream endless belt 2b and the second downstream endless belt 3b.

[0030] In the conveyor means 1, the length of the first upstream endless belt 2a from the conveying start side is made longer than the length of the second upstream endless belt 2b, while the length of the first downstream endless belt 3a from the conveying end side is made shorter than the length of the second downstream endless belt 3b.

[0031] Therefore, the pressurized water jetting gap 5 provided between the first upstream endless belt 2a and the first downstream endless belt 3a, and the pressurized water jetting gap 6 provided between the second upstream endless belt 2b and the second downstream endless belt 3b are provided at a certain interval in the transporting direction of the fish A, and a part of the downward-facing fish clamping transporting surface of the first upstream endless belt 2a is exposed downward through the pressurized water jetting gap 6 provided on the upstream side.

[0032] On the other hand, a part of the upward fish holding and conveying surface of the second downstream endless belt 3b is exposed upward through the pressurized water jetting gap 5 provided on the downstream side. Note that the above-mentioned pressurized water jetting gaps 5, 6 may be a conveyor means 1 in which one of the pressurized water jetting gaps is provided on the upstream side and the other is provided on the downstream side.

[0033] As shown in Figures 1 to 4, a pair of left and right pressurized water jetting means 7, 7 for removing scales from the fish body A transported by the conveyor means 1 is arranged in the pressurized water jetting gap 5, and a pair of left and right pressurized water jetting means 7, 7 for removing scales from the fish body A transported by the conveyor means 1 is also arranged in the pressurized water jetting gap 6.

[0034] As shown in Figures 4 to 6, the pressurized water injection means 7 comprises a cylindrical nozzle housing 71 with one end closed and the other end opened, a pressurized water supply pipe 72 arranged with one end inserted into the nozzle housing 71, a pressurized water receiving cylinder 73 arranged in a rotatable manner fitted onto one end of the pressurized water supply pipe 72, and a pressurized water injection nozzle 74 fixed in a state of communication with the pressurized water receiving cylinder 73.

[0035] The nozzle outer casing 71 of the pressurized water injection means 7 is arranged with a portion of its outer circumferential surface facing the pressurized water injection gaps 5, 6, and a long hole 711 that penetrates between the inner and outer circumferential surfaces and is long in the circumferential direction [the width direction (dorsal-ventral direction) of the fish body A] is formed on the outer circumferential surface facing the pressurized water injection gaps 5, 6.

[0036] One end of a pressurized water supply pipe 72 for supplying pressurized water W is inserted into and fixed in the nozzle outer housing 71. The pressurized water supply pipe 72 is disposed such that the axis of the one end coincides with the axis of the nozzle outer housing 71.

[0037] A pressurized water flow path 721 with one end closed is formed within the pressurized water supply pipe 72, and a plurality of water passage holes 722 extending radially in the radial direction and opening onto the outer peripheral surface of the pressurized water supply pipe 72 are formed at one end of this pressurized water flow path 721, and are configured to communicate with water passage holes 733 of the pressurized water receiving cylinder 73 described later.

[0038] The pressurized water receiving cylinder 73 has an axial hole 731 penetrating between both end faces, and this axial hole 731 is rotatably fitted onto one end of the pressurized water supply pipe 72 disposed inside the nozzle outer casing 71. The axial hole 731 of the pressurized water receiving cylinder 73 is formed to have a diameter larger than the outer diameter of one end of the pressurized water supply pipe 72 over the entire circumference at the middle part in the axial direction, and has a large-diameter opening 732 that receives pressurized water ejected from the multiple water passage holes 722 of the pressurized water supply pipe 72. A water passage hole 733 is formed penetrating between the outer periphery of the large-diameter opening 732 and the outer periphery of the pressurized water receiving cylinder 73, and a pressurized water injection nozzle 74 that injects pressurized water W is attached to the outer tip of this water passage hole 733.

[0039] The water passage hole 733 of the pressurized water receiving cylinder 73 is slightly eccentric from the axis of the pressurized water receiving cylinder 73, and the pressurized water jet nozzle 74 is configured to rotate at high speed within the fixed nozzle outer casing 71 together with the pressurized water receiving cylinder 73 due to the injection reaction force of the pressurized water jetted from the pressurized water jet nozzle 74 through this slightly eccentric water passage hole 733.

[0040] The pressurized water ejection nozzle 74 of the pressurized water ejection means 7 is configured to rotate at high speed within the fixed nozzle outer casing 71, and when it faces the long hole 711, to move at high speed in the lengthwise direction of the long hole 711 through the long hole 711, thereby ejecting pressurized water W onto the surface of the fish body A.

[0041] Two pressurized water jetting means 7 are provided in each of the pressurized water jetting gaps 5 and 6. Of the two pressurized water jetting means 7, 7 provided in each of the pressurized water jetting gaps 5 and 6, one of the pressurized water jetting means 7 is configured to jet the pressurized water W jetted from its pressurized water jetting nozzle 74 onto the abdominal surface in the width direction of the fish body A (the surface from the central top in the width direction to the abdominal part), while the other pressurized water jetting means 7 is configured to jet the pressurized water W jetted from its pressurized water jetting nozzle 74 onto the dorsal surface in the width direction of the fish body A (the surface from the central top in the width direction to the dorsal part). Thus, the pressurized water W jetted from both of the pressurized water jetting means 7 provided in each of the pressurized water jetting gaps 5 and 6 is jetted over the entire width direction of the fish body A, so that the scales of the fish body A are entirely peeled off.

[0042] The pressurized water W sprayed from the pressurized water spraying nozzle 74 of the pressurized water spraying means 7 is sprayed onto the scales on the surface of the fish body A from a direction inclined with respect to the surface of the fish body A (a direction inclined toward the head or tail fin, preferably a direction inclined toward the tail fin as shown in Figure 3), and the high-pressure pressurized water W is sprayed onto the scales from an oblique direction multiple times, so that the high-pressure pressurized water W applies an oblique pressing force to the scales, causing the scales to quickly stand up and at the same time enabling them to be instantly peeled off from the base.

[0043] Next, the usage of the fish scale removing device will be described. By driving the drive pulleys of the first upstream endless belt 2a, the first downstream endless belt 3a, the second upstream endless belt 2b, and the second downstream endless belt 3b of the conveyor means 1, respectively, the fish clamping and conveying surface 4 formed by the upper and lower opposing surfaces of the first upstream endless belt 2a, the first downstream endless belt 3a, the second upstream endless belt 2b, and the second downstream endless belt 3b is conveyed in the fish conveying direction (from right to left on the paper in FIG. 1).

[0044] The fish body A is supplied lying down with its head side facing downward through the opening at the conveying starting point of the upper and lower opposing surfaces of the first endless belt 2 and the second endless belt 3 in the conveyor means 1, i.e., the opening at the conveying starting point of the upper and lower opposing surfaces of the first upstream endless belt 2a and the second upstream endless belt 2b, and the fish body A is clamped from above and below by the fish body clamping conveying surfaces 4, 4, and the fish body A is conveyed with its length direction (the direction passing through the head and tail fin) facing the conveying direction.

[0045] When the fish body A passes through the pressurized water jetting gaps 5, 6, a pair of pressurized water jetting means 7, 7 are disposed in each of the pressurized water jetting gaps 5, 6, and the pressurized water W jetted from the pressurized water jetting nozzle 74 of the pressurized water jetting means 7 is sprayed onto the scales of the fish body A from above and below.

[0046] When the pressurized water W is sprayed from the pressurized water jet nozzle 74 of the pressurized water jetting means 7 onto the scales of the fish body A, the fish body A is received and positioned by the endless belt (the first upstream endless belt 2a or the second downstream endless belt 3b) facing the pressurized water jetting means 7, and the variation in the distance from the pressurized water jet nozzle 74 of the pressurized water jetting means 7 to the surface of the fish body A is reduced. Therefore, the variation in the pressure, amount and number of sprays of the pressurized water sprayed from the pressurized water jet nozzle 74 of the pressurized water jetting means 7 onto the scales of the fish body A is reduced, and the scales of the fish body A can be removed reliably at all times.

[0047] The pressurized water W sprayed from the pressurized water spray nozzle 74 of the pressurized water spraying means 7 is sprayed evenly onto the row of scales arranged in a row in the width direction (dorsal-ventral direction) of the fish body several times while moving at high speed in the width direction of the fish body as the scales are transported a distance equivalent to the length of the scales (the length of the scales in the direction connecting the head and caudal fin) through the long hole 711 in the fixed nozzle outer casing 71, thereby ensuring that the high-pressure pressurized water W is sprayed onto all scales multiple times.

[0048] 7, the pressurized water W injected from the pressurized water injection nozzle is sprayed diagonally against the scales of the fish body A multiple times, so that the scales 81 are subjected to a stress with a time lag which presses them in a direction to stand up with their roots 811 as a fulcrum, and a stress which pushes the upright scales 81 back towards the fish body A with the roots 811 as a fulcrum. As a result, the scales 81 move in an undulating direction (up and down in FIG. 7) with the roots 811 as a fulcrum, weakening the attachment part of the roots 811 of the scales 81 to the fish body A, releasing the attachment of the roots 811 of the scales 81 attached to the fish body A, and the scales 81 are quickly removed from the surface of the fish body A.

[0049] The pressurized water W can also enter the gap K between the scales 81 that have been raised by the impact force applied by the pressurized water W and the scales 82 adjacent to the starting end of the transport of the fish body A, thereby facilitating the detachment of the raised scales 81.

[0050] The pressurized water W is sprayed onto the surface of the fish body A with a sufficient spray length through the long hole 711 while rotating at high speed. Even if the pressurized water jet nozzle 74 is brought close to the surface of the fish body A, the pressurized water W can be sprayed onto the surface of the fish body A with a sufficient spray length, and one pressurized water jet nozzle 74 can reliably spray the pressurized water W over the entire row of scales from the center in the width direction of the fish body A to the abdominal side or dorsal fin side.

[0051] Pressurized water is sprayed from above and below onto the surface of the fish body A from a pair of left and right pressurized water spraying means 7, 7 arranged in each of the pressurized water spraying gaps 5, 6, and the pressurized water W is sprayed onto the entire surface of the fish body A, so that the scales of the fish body A can be completely removed.

[0052] Therefore, the pressurized water W can be sprayed onto the surface of the fish A while minimizing the pressure loss of the pressurized water W ejected from the pressurized water injection nozzle 74, the supply pressure supplied to the pressurized water supply pipe can be minimized, the pressure pump can be made smaller, power consumption can be reduced, and the fish scale removal device can be operated without the need for construction of a power supply facility.

[0053] In addition, since the pressurized water W can be sprayed with sufficient pressure from the pressurized water injection nozzle 74 onto the scales of the fish A, the amount of pressurized water W sprayed onto the scales can be reduced, and there is no need to recycle the pressurized water W as in conventional fish scale removal devices, which is also excellent in terms of hygiene.

[0054] In the above-mentioned fish scale removing device, the first endless belt 2 and the second endless belt 3 are arranged at a predetermined interval in the vertical direction. However, the first endless belt 2 and the second endless belt 3 may be arranged at a predetermined interval in the horizontal direction (the direction perpendicular to the paper surface in FIG. 1). In this case, the fish scale removing device shown in FIG. 1 is a plan view seen from the vertical direction. Each component of the fish scale removing device shown in FIG. 1 is the same, so the description is omitted. In use, the fish A is fed from the head side with its back and ventral direction facing up and down through the openings at the conveying start ends of the left and right opposing surfaces of the first endless belt 2 and the second endless belt 3 in the conveyor means 1, that is, the openings at the conveying start ends of the opposing surfaces (left and right opposing surfaces) of the first upstream endless belt 2a and the second upstream endless belt 2b. Then, the pressurized water W is sprayed from the pressurized water injection nozzle 74 of the pressurized water injection means 7 from the left and right directions onto the fish A held and conveyed between the fish holding and conveying surfaces 4, 4.

[0055] In the above-mentioned fish scale removing device, the first endless belt 2 includes the first upstream endless belt 2a and the second downstream endless belt 2b, and the second endless belt 3 includes the second upstream endless belt 2b and the second downstream endless belt 3b, but the first endless belt 2 and the second endless belt 3 are only required to be configured so that the fish A can be conveyed in the conveying direction by the fish clamping and conveying surfaces 4, 4 formed by the upper and lower opposing surfaces of these endless belts, and the number and arrangement of the endless belts constituting each of the first endless belt 2 and the second endless belt 3 are not particularly limited. For example, as long as the fish A can be conveyed in the conveying direction by the first upstream side 2a of the first endless belt 2 and the second upstream endless belt 2b and the second downstream endless belt 3b of the second endless belt 3, the first downstream endless belt 3a of the first endless belt 2 does not necessarily need to be provided.

[0056] In the above-mentioned fish scale removing device, the pressurized water jetting means 7 is configured so that the pressurized water jetted from the pressurized water jetting nozzle 74 is sprayed through the pressurized water jetting gaps 5, 6 formed between the endless belts onto the surface of the fish body A being transported on the transport path by the conveyor means 1, but the pressurized water jetting means 7 does not need to be disposed between the endless belts, and it is sufficient that the pressurized water jetted from the pressurized water jetting nozzle 74 is disposed so as to be sprayed onto the surface of the fish body A being transported on the transport path by the conveyor means 1. Therefore, when the first downstream endless belt 3a of the first endless belt 2 is not disposed, the pressurized water jetting means 7 may be disposed on the transport terminal side of the first upstream endless belt 2a.

[0057] In the above-mentioned fish scale removing device, the pressurized water jetting means 7 is arranged to jet pressurized water from its pressurized water jetting nozzle 74 toward the fish body clamping and conveying surfaces 4, 4 constituted by the opposing surfaces of the first endless belt 2 and the second endless belt 3. Furthermore, the pressurized water jetting means 7 may be arranged on either side or both sides of the gap formed between the opposing surfaces of the first endless belt 2 and the second endless belt 3 (either side or both sides in a direction intersecting or perpendicular to the conveying direction of the fish body clamping and conveying surfaces 4, 4), and the pressurized water jetted from the pressurized water jetting means 7 may be sprayed from the dorsal side or ventral side of the fish body A that is clamped and conveyed between the fish body clamping and conveying surfaces 4, 4 of the conveyor means 1. It is preferable that the jetting direction of the pressurized water jetted from the pressurized water jetting means 7 is a direction generally along the surface direction of the fish body clamping and conveying surfaces 4, 4.

[0058] In this case, the pressurized water jetting means 7 is disposed so that the long hole 711 of its fixed nozzle outer casing 71 faces the fish body A that is held and transported between the fish body holding and transporting surfaces 4, 4 of the conveyor means 1. The long hole 711 of the fixed nozzle outer casing 71 of the pressurized water jetting means 7 is disposed so that its length direction faces the transporting direction of the fish body A, and the pressurized water W jetted from the pressurized water jetting nozzle 74 is uniformly sprayed onto the surface of the fish body A from the side through the long hole 711 of the fixed nozzle outer casing 71 while moving at high speed in the same direction as or opposite to the transporting direction. Since the pressurized water W is sprayed from the dorsal or ventral direction of the fish body A, the pressurized water W can effectively enter between the scale 81 and the scale 82 arranged adjacent to the scale 81 in the transporting direction of the fish body A, thereby improving the effect of removing the scales of the fish body A. [Explanation of symbols]

[0059] 1 Conveyor means 2. First endless belt 2a 1st upstream endless belt 3a 1st upstream endless belt 3. Second endless belt 2b Second downstream endless belt 3b 2nd downstream endless belt 4 Fish holding and conveying surface 5, 6 Pressure water injection gap 7. Pressurized water injection means 71 Fixed nozzle housing 711 Long hole 72 Pressure water supply pipe 721 Pressure Water Channel 722 Water Vent 73 Cylinder 731 Shaft hole 732 Large diameter mouth 733 Waterway hole 74 Pressure Water Injection Nozzle 8 Scales A Fish body W Pressurized water

Claims

1. a conveyor means including a first endless belt and a second endless belt, the opposing surfaces of which form a fish holding and conveying surface; a pressurized water jetting means for jetting pressurized water onto the surface of the fish body conveyed on the conveying path of the fish body in a direction passing through the head and the tail fin in the conveying direction to remove the scales of the fish body, the pressurized water jetting means includes a pressurized water jetting nozzle which moves in the width direction of the fish body several times to spray pressurized water onto the scales of the fish body several times while the scales arranged in a row in the width direction of the fish body are transported a distance corresponding to the length of the scales in the transport direction of the fish body, thereby removing the scales; The pressure water injection means is A cylindrical fixed nozzle housing with a part of its outer circumferential surface facing the transport path of the fish; A long hole opening toward the fish body on a part of the outer peripheral surface of the fixed nozzle outer casing; a pressure water receiving cylinder rotatably disposed within the fixed nozzle housing and connected to a pressure water supply pipe; a pressurized water injection nozzle that is connected to and supported by the pressurized water receiving cylinder, has a tip facing the long hole, and rotates together with the pressurized water receiving cylinder within the fixed nozzle outer casing due to the reaction force of pressurized water injected from the tip.

2. The first endless belt includes a first upstream endless belt and a first downstream endless belt, and a gap for pressurized water injection is provided between the first upstream endless belt and the first downstream endless belt in the transport path of the fish body, 2. The fish scale removing device according to claim 1, wherein the pressurized water injection means is configured to inject pressurized water toward the pressurized water injection gap and onto the surface of the fish passing through the pressurized water injection gap.

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